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Journal articles on the topic 'Precession'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kerswell, R. R. "Upper bounds on the energy dissipation in turbulent precession." Journal of Fluid Mechanics 321 (August 25, 1996): 335–70. http://dx.doi.org/10.1017/s0022112096007756.

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Rigorous upper bounds on the viscous dissipation rate are identified for two commonly studied precessing fluid-filled configurations: an oblate spheroid and a long cylinder. The latter represents an interesting new application of the upper-bounding techniques developed by Howard and Busse. A novel ‘background’ method recently introduced by Doering & Constantin is also used to deduce in both instances an upper bound which is independent of the fluid's viscosity and the forcing precession rate. Experimental data provide some evidence that the observed viscous dissipation rate mirrors this be

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2

Horton, Maya A., Martin G. H. Krause, and Martin J. Hardcastle. "3D hydrodynamic simulations of large-scale precessing jets: radio morphology." Monthly Notices of the Royal Astronomical Society 499, no. 4 (2020): 5765–81. http://dx.doi.org/10.1093/mnras/staa3020.

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ABSTRACT The prospect of relativistic jets exhibiting complex morphologies as a consequence of geodetic precession has long been hypothesized. We have carried out a 3D hydrodynamics simulation study varying the precession cone angle, jet injection speed, and number of turns per simulation time. Using proxies for the radio emission we project the sources with different inclinations to the line of sight to the observer. We find that a number of different precession combinations result in characteristic ‘X’ shaped sources which are frequently observed in radio data, and some precessing jet morpho

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Marques, Francisco, and Juan M. Lopez. "Precession of a rapidly rotating cylinder flow: traverse through resonance." Journal of Fluid Mechanics 782 (October 6, 2015): 63–98. http://dx.doi.org/10.1017/jfm.2015.524.

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Recent experiments using a rapidly rotating and precessing cylinder have shown that for specific values of the precession rate, aspect ratio and tilt angle, sudden catastrophic transitions to turbulence occur. Even if the precessional forcing is not too strong, there can be intermittent recurrences between a laminar state and small-scale chaotic flow. The inviscid linearized Navier–Stokes equations have inertial-wave solutions called Kelvin eigenmodes. The precession forces the flow to have azimuthal wavenumber $m=1$ (spin-over mode). Depending on the cylinder aspect ratio and on the ratio of

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Gorr, G. V. "Precession motions of a gyrostat, having a fixed point, in three homogeneous force fields." Известия Российской академии наук Механика твердого тела, no. 2 (November 12, 2024): 283–304. http://dx.doi.org/10.31857/s1026351924020148.

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The subject of investigation is the problem on precession motions of a gyrostat with a fixed point in three homogeneous force fields. The class of precessions under consideration is characterized by the constancy of the precession angle and by the commensurability of the precession and proper rotation velocities. Equations of a gyrostat motion are reduced to a system of three second order differential equations with respect to velocities of precession and proper rotation. Integration of these equations was conducted in the case of precessionally isoconic motions (the precession velocity equals

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5

Fukue, Jun, and Takeo Yokoo. "Are Bipolar Jets Precessing?" Symposium - International Astronomical Union 115 (1987): 379–81. http://dx.doi.org/10.1017/s007418090009598x.

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No one has drawn attention as to whether bipolar jets precess or not. We examine here the possibility of precession of bipolar jets from a theoretical point of view (Fukue and Yokoo 1986).We first characterize various models proposed for bipolar jets in the light of precession. That is, can they admit precession? If they can, how long is a precessional period P?

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Huang, Bao-Quan, and Tong Liu. "Polarization in Early Optical Afterglows of Gamma-Ray Bursts Driven by Precessing Jets." Astrophysical Journal 933, no. 1 (2022): 103. http://dx.doi.org/10.3847/1538-4357/ac752a.

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Abstract Jet precessions are widely involved in astrophysical phenomena from galaxies to X-ray binaries and gamma-ray bursts (GRBs). Polarization presents a unique probe of the magnetic fields in GRB jets. The precession of GRB relativistic jets will change the geometry within the observable emitting region of the jet, which can potentially affect the polarization of the afterglow. In this paper, we take into account jet precession to study the polarization evolution and corresponding light curves in GRB early optical afterglows with ordered and random magnetic field geometries. We find that t

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7

Weng, Zi-Hua. "Precessional angular velocity and field strength in the complex octonion space." International Journal of Geometric Methods in Modern Physics 17, no. 07 (2020): 2050091. http://dx.doi.org/10.1142/s0219887820500917.

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The paper aims to apply the octonions to explore the precessional angular velocities of several particles in the electromagnetic and gravitational fields. Some scholars utilize the octonions to research the electromagnetic and gravitational fields. One formula can be derived from the octonion torque, calculating the precessional angular velocity generated by the gyroscopic torque. When the octonion force is equal to zero, it is able to deduce the force equilibrium equation and precession equilibrium equation and so forth. From the force equilibrium equation, one can infer the angular velocity

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8

Huang, H. B., X. Q. Ma, Z. H. Liu, et al. "Micromagnetic Simulation of Spin Transfer Torque Magnetization Precession Phase Diagram in a Spin-Valve Nanopillar under External Magnetic Fields." ISRN Condensed Matter Physics 2012 (August 23, 2012): 1–12. http://dx.doi.org/10.5402/2012/387380.

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We investigated spin transfer torque magnetization precession in a nanoscale pillar spin-valve under external magnetic fields using micromagnetic simulation. The phase diagram of the magnetization precession is calculated and categorized into four states according to their characteristics. Of the four states, the precessional state has two different modes: steady precession mode and substeady precession mode. The different modes originate from the dynamic balance between the spin transfer torque and the Gilbert damping torque. Furthermore, we reported the behavior of the temporal evolutions of

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9

Алексеенко, C. В., С. И. Шторк та Р. Р. Юсупов. "Влияние способа подачи воздуха на параметры прецессирующего вихревого жгута в гидродинамической вихревой камере". Письма в журнал технической физики 44, № 5 (2018): 79. http://dx.doi.org/10.21883/pjtf.2018.05.45711.16786.

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AbstractThe effect of the method of gas-phase injection into a swirled fluid flow on parameters of a precessing vortex core is studied experimentally. Conditions of the appearance of the vortex-core precession effect were modeled in a hydrodynamic sudden expansion vortex chamber. The dependences of the vortexcore precession frequency, flow-pulsation level, and full pressure differential in the vortex chamber on the consumption gas content in the flow have been obtained. The results of measurements permit one to determine optimum conditions for the most effective control of vortex-core precessi

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Haswell, С. A., S. B. Foulkes, D. J. Rolfe, et al. "Spectroscopic Diagnostics of Precessing Discs: The Stream-Disc Impact in XTE J1118+480 (= KV UMA) in Outburst." International Astronomical Union Colloquium 194 (July 2004): 160–61. http://dx.doi.org/10.1017/s0252921100152303.

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AbstractWe present orbital trailed spectrograms of XTE J1118+480 taken at the rise to outburst maximum in 2000. These show an evolving S-wave feature arising from the stream impact on the edge of the eccentric precessing disc. By comparing the observed S-waves with those generated in an SPH simulation, we deduce the disc precession phases corresponding to our observations. Hence we infer changes in the disc precession period around the outburst maximum: taken at face value our spectroscopy suggests a precession period temporarily as short as 20 days.

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DeLaurentiis, Stanislav, Zoltán Haiman, John Ryan Westernacher-Schneider, et al. "Relativistic Binary Precession: Impact on Eccentric Massive Binary Black Hole Accretion and Hydrodynamics." Astrophysical Journal 980, no. 1 (2025): 55. https://doi.org/10.3847/1538-4357/ada612.

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Abstract Recent hydrodynamical simulations have shown that circumbinary gas disks drive the orbits of massive binary black holes (BHs) to become eccentric, even when general relativistic (GR) corrections to the orbit are significant. Here, we study the GR apsidal precession of eccentric equal-mass massive binary BHs in circumbinary disks via two-dimensional hydrodynamical simulations. We perform a suite of simulations comparing precessing and nonprecessing binaries across a range of eccentricities, semimajor axes, and precession rates. We find that the GR precession of the binary's semimajor a

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Shen, Ye, and Bin Chen. "Precession and split of tilted, geometrically thin accretion disk: an analytical study." Journal of Cosmology and Astroparticle Physics 2024, no. 07 (2024): 063. http://dx.doi.org/10.1088/1475-7516/2024/07/063.

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Abstract It has been observed that many relativistic jets display a kind of cork-screw-like precession. Numerical simulations has suggested that such kind of precession may originate from the precession of the disk. In this work, we introduce an analytical model to describe the precession and split of a tilted, geometrically thin disk. We consider the Lense-Thirring effect from the central (primary) black hole (BH) and the gravitational effect from the companion (secondary) BH far away from the center, both of which could induce the precession of the accretion disk around the spin axis of cent

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CULCER, DIMITRIE. "STEADY-STATE SPIN DENSITIES AND CURRENTS." International Journal of Modern Physics B 22, no. 27 (2008): 4765–91. http://dx.doi.org/10.1142/s021797920804911x.

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This article reviews steady-state spin densities and spin currents in materials with strong spin-orbit interactions. These phenomena are intimately related to spin precession due to spin-orbit coupling, which has no equivalent in the steady state of charge distributions. The focus will initially be on effects originating from the band structure. In this case, spin densities arise in an electric field because a component of each spin is conserved during precession. Spin currents arise because a component of each spin is continually precessing. These two phenomena are due to independent contribu

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Шутый, А. М., Т. М. Василевская та Д. И. Семенцов. "Резонансная динамика намагниченности одноосной наночастицы". Физика твердого тела 64, № 6 (2022): 646. http://dx.doi.org/10.21883/ftt.2022.06.52389.279.

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Analysis of equilibrium conditions was carried out and resonant precessional dynamics of magnetization of a single-domain magnetically uniaxial ellipsoidal particle. Сonsidered the case when magnetic field is along the easy magnetization axis. the easy magnetization axis is directed parallel to the axis of symmetry of the ellipsoid and transverse to pumping by a weak high-frequency field. Features of the behavior of the magnetization were discovered. It has been revealed that the magnetization has features of resonant behavior: large resonant precession angles with amplitude , elliptical devia

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Van Zanten, Leonard. "Earth's journey." JOURNAL OF ADVANCES IN PHYSICS 12, no. 1 (2016): 4197–203. http://dx.doi.org/10.24297/jap.v12i1.174.

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In the beginning the earth was flat and no one was to prove that it was round, but with the advent in science this is now quite obvious. Â But no less obvious will be the fact that the earth has its seasons due to a rotation of precession rather than the fixed immovable position that current science has given it.Â And that in a manner of speaking the earth, like unto the moon orbiting the earth, also appears to have a single period of rotation for each orbital period that it makes around the sun.The earth thus for each single orbit around the sun makes one full turn of precession which gives i

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Shytyi. A.M., Vasilevskaya T. M., and Sementsov D. I. "Resonant dynamics of the magnetization of uniaxial nanoparticle." Physics of the Solid State 64, no. 6 (2022): 635. http://dx.doi.org/10.21883/pss.2022.06.53825.279.

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Analysis of equilibrium conditions was carried out and resonant precessional dynamics of magnetization of a single-domain magnetically uniaxial ellipsoidal particle. Considered the case when magnetic field is along the easy magnetization axis. the easy magnetization axis is directed parallel to the axis of symmetry of the ellipsoid and transverse to pumping by a weak high-frequency field. Features of the behavior of the magnetization were discovered. It has been revealed that the magnetization has features of resonant behavior: large resonant precession angles with amplitude 0.5M0, elliptical

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17

Facchin, Morgan. "A derivation of precessional effects in the Foucault pendulum using complex numbers." American Journal of Physics 93, no. 4 (2025): 308–13. https://doi.org/10.1119/5.0237736.

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It is found that the exact equations governing the motion of the Foucault pendulum take a simpler form when describing the pendulum's position as a complex number evolving in the complex plane. In this description, three notable effects (the intrinsic precession, the Foucault precession, and the Crane effect) appear as natural solutions without prior assumptions on their precessional nature. The pedagogical value of the problem is discussed, emphasizing its connections to time-reversal symmetry and the use of complex numbers in two-dimensional problems.

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Dominik, Rune M., Lena Linhoff, Dominik Elsässer, and Wolfgang Rhode. "3C 84: a possibly precessing jet in 43-GHz observations." Monthly Notices of the Royal Astronomical Society 503, no. 4 (2021): 5448–54. http://dx.doi.org/10.1093/mnras/stab799.

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ABSTRACT The central galaxy of the Perseus galaxy cluster, 3C 84 or NGC 1275, hosts one of the closest and well-observed active galactic nuclei (AGNs) and thus offered insights into a variety of phenomena over the past decades. Although close and well observed, some key properties of 3C 84 remain unknown. One of these properties is the inclination angle between the jet and the line of sight, for which a wide range of values can be found in publications. Previous studies have indicated a precessing behaviour of 3C 84’s jet that could explain these discrepancies. In this work, we analyse this be

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Ripepe, Maurizio, and Alfred G. Fischer. "Stratigraphic rhythms synthesized from orbital variations." Bulletin (Kansas Geological Survey), no. 233 (April 16, 2024): 335–44. https://doi.org/10.17161/kgsbulletin.no.233.20466.

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Previous work on a pelagic stratigraphic sequence in the Middle Cretaceous (Albian) of Italy, about 100 Ma, defined a hierarchy of oscillations. These were identified as variations in carbonate productivity and bottom fauna linked to seafloor aeration. The sequence geometry suggests response to orbitally driven climatic variations, reflecting Berger's precession index, which depicts the precession cycle as a carrier wave modulated by orbital eccentricity. Here we use Berger's astronomic precession index curve for the past 1,500 k.y. in combination with the stratigraphic data to construct a for

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Pizzi, F., G. Mamatsashvili, A. J. Barker, A. Giesecke, and F. Stefani. "Interplay between geostrophic vortices and inertial waves in precession-driven turbulence." Physics of Fluids 34, no. 12 (2022): 125135. http://dx.doi.org/10.1063/5.0131035.

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The properties of rotating turbulence driven by precession are studied using direct numerical simulations and analysis of the underlying dynamical processes in Fourier space. The study is carried out in the local rotating coordinate frame, where precession gives rise to a background shear flow, which becomes linearly unstable and breaks down into turbulence. We observe that this precession-driven turbulence is in general characterized by coexisting two-dimensional (2D) columnar vortices and three-dimensional (3D) inertial waves, whose relative energies depend on the precession parameter Po. Th

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Sun, Qi-Bin, Sheng-Bang Qian, Li-Ying Zhu, et al. "A New Window for Studying Intermediate Polars and Tilted Accretion Disk Precession." Astrophysical Journal 966, no. 1 (2024): 83. http://dx.doi.org/10.3847/1538-4357/ad2fc2.

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Abstract TV Col is a long-period eclipsing intermediate polar (IP) prototype star for the negative superhump (NSH) system. We investigate the eclipse minima, eclipse depth, and NSH amplitude based on TESS photometry. Using the same analytical method as for SDSS J081256.85+191157.8, we find periodic variations of O − C for eclipse minima and NSH amplitudes with periods of 3.939(25) days and 3.907(30) days, respectively. The periodic variation of the NSH amplitude of TV Col confirms that periodic changes in NSH amplitude in response to the tilted disk precession may be universal, which is furthe

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Gorr, G.V., A.V. Mazniev, and T.V. Belokon. "ABOUT RESONANT PRECESSIONS OF RIGID BODIES WITH A FIXED POINT." Bulletin of Donetsk National University. Series А. Natural Sciences, no. 4 (December 3, 2024): 11–17. https://doi.org/10.5281/zenodo.14227446.

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The article addresses the problem of the motion of a dynamically symmetric rigid body with a fixed point in a force field, which is a superposition of three uniform force fields. The issue of the existence of resonant precessions characterized by the comparability of the precession and the body's intrinsic rotation speeds is studied. It is proven that resonant precessions of the form   do not exist for

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Solanki, Siddhant, Agnieszka M. Cieplak, Jeremy Schnittman, et al. "Short-period Heartbeat Binaries from TESS Full-frame Images." Astrophysical Journal Supplement Series 276, no. 1 (2024): 17. https://doi.org/10.3847/1538-4365/ad8a62.

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Abstract We identify 240 short-period (P ≲ 10 days) binary systems in Transiting Exoplanet Survey Satellite data, 180 of which are heartbeat binaries. The sample is mostly a mix of A- and B-type stars and primarily includes eclipsing systems, where over 30% of the sources with primary and secondary eclipses show a secular change in their intereclipse timings and relative eclipse depths over a multiyear timescale, likely due to orbital precession. The orbital parameters of the population are estimated by fitting a heartbeat model to their phase curves and Gaia magnitudes, where the model accoun

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Horton, Maya A., Martin J. Hardcastle, Shaun C. Read, and Martin G. H. Krause. "A Markov chain Monte Carlo approach for measurement of jet precession in radio-loud active galactic nuclei." Monthly Notices of the Royal Astronomical Society 493, no. 3 (2020): 3911–19. http://dx.doi.org/10.1093/mnras/staa429.

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ABSTRACT Jet precession can reveal the presence of binary systems of supermassive black holes. The ability to accurately measure the parameters of jet precession from radio-loud active galactic nuclei is important for constraining the binary supermassive black hole population, which is expected as a result of hierarchical galaxy evolution. The age, morphology, and orientation along the line of sight of a given source often result in uncertainties regarding the jet path. This paper presents a new approach for efficient determination of precession parameters using a two-dimensional Markov chain

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Klein, Ygal Y., and Boaz Katz. "Hierarchical three-body problem at high eccentricities = simple pendulum – III. Precessing quadrupole." Monthly Notices of the Royal Astronomical Society: Letters 539, no. 1 (2025): L7—L13. https://doi.org/10.1093/mnrasl/slaf017.

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ABSTRACT The very long-term evolution of the hierarchical restricted three-body problem with a slightly aligned precessing quadrupole potential is investigated analytically and solved for both rotating and librating Kozai–Lidov cycles (KLCs) with high eccentricities. We describe the finding of a striking similarity between librating and rotating KLCs for some range of precession rates. We show that the main effect occurs in both categories when the KLC frequency is equal to the precession rate of the perturbing potential. We solve the resonant dynamics analytically and show that it is equivale

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Körfer, Martin, Raymond Kind, and Hartmut Fuess. "Deuteron Magnetic Resonance (DMR) - Study on CD3NH3HgCl3." Zeitschrift für Naturforschung A 44, no. 12 (1989): 1177–82. http://dx.doi.org/10.1515/zna-1989-1208.

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Abstract Deuteron magnetic resonance (DMR) spectroscopic was performed on a single crystal of CD3NH3HgCl3. The electric field gradient tensors of the independent CD3NH3+- groups were determined by quadrupole perturbed NMR. NMR-NQR-rotation patterns were recorded in the ferro- (T = 295 K) and paraelectric (F = 342 K) phases. In the ferroelectric phase a precessional motion of the CD3NH3+-group was detected. The angle %(T) between the axis of the molcculc and the precession-axis increases with temperature. In the paraelectric phase the precession of methylammonium is superimposed by an anisotrop

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Holmqvist, C., W. Belzig, and M. Fogelström. "Non-equilibrium charge and spin transport in superconducting–ferromagnetic–superconducting point contacts." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2125 (2018): 20150229. http://dx.doi.org/10.1098/rsta.2015.0229.

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The conventional Josephson effect may be modified by introducing spin-active scattering in the interface layer of the junction. Here, we discuss a Josephson junction consisting of two s-wave superconducting leads coupled over a classical spin that precesses with the Larmor frequency due to an external magnetic field. This magnetically active interface results in a time-dependent boundary condition with different tunnelling amplitudes for spin-up and -down quasi-particles and where the precession produces spin-flip scattering processes. As a result, the Andreev states develop sidebands and a no

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Suvorov, A. G., and K. D. Kokkotas. "Precessing magnetars as central engines in short gamma-ray bursts." Monthly Notices of the Royal Astronomical Society 502, no. 2 (2021): 2482–94. http://dx.doi.org/10.1093/mnras/stab153.

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ABSTRACT Short gamma-ray bursts that are followed by long-duration X-ray plateaus may be powered by the birth, and hydrodynamic evolution, of magnetars from compact binary coalescence events. If the rotation and magnetic axes of the system are not orthogonal to each other, the star will undergo free precession, leading to fluctuations in the luminosity of the source. In some cases, precession-induced modulations in the spin-down power may be discernible in the X-ray flux of the plateau. In this work, 25 X-ray light curves associated with bursts exhibiting a plateau are fitted to luminosity pro

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Papaloizou, John C. B. "Disc Modes and Orbital Eccentricity Growth." Symposium - International Astronomical Union 202 (2004): 232–34. http://dx.doi.org/10.1017/s0074180900217956.

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An eccentric protoplanetary gaseous disc provides a slowly precessing non axisymmetric mass distribution. As a result of self-gravity, the precession frequency may resonate with that of a near circular protoplanet orbit within an inner cavity. A large eccentricity might then be produced.

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Sob’yanin (Денис Николаевич Собьянин), Denis Nikolaevich. "Periodic fast radio bursts from forcedly precessing neutron stars, anomalous torque, and internal magnetic field for FRB 180916.J0158+65 and FRB 121102." Monthly Notices of the Royal Astronomical Society 497, no. 1 (2020): 1001–7. http://dx.doi.org/10.1093/mnras/staa1976.

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ABSTRACT A recent discovery of the periodic activity of the repeating fast radio burst source FRB 180916.J0158+65 in the Canadian Hydrogen Intensity Mapping Experiment (CHIME) hints at possible origin of the FRB from a freely precessing neutron star with a magnetar magnetic field of about 1016 G. However, the absence of simultaneously detected high-energy emission in the Swift and AGILE observations imposes stringent constraints on the field magnitude and questions the possibility of such a progenitor. We show that consideration of forced precession of a neutron star does not encounter the dif

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NATHAN, G. J., S. J. HILL, and R. E. LUXTON. "An axisymmetric ‘fluidic’ nozzle to generate jet precession." Journal of Fluid Mechanics 370 (September 10, 1998): 347–80. http://dx.doi.org/10.1017/s002211209800202x.

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A continuously unstable precessing flow within a short cylindrical chamber following a large sudden expansion is described. The investigation relates to a nozzle designed to produce a jet which achieves large-scale mixing in the downstream field. The inlet flow in the plane of the sudden expansion is well defined and free from asymmetry. Qualitative flow visualization in water and semi-quantitative surface flow visualization in air are reported which identify this precession within the chamber. Quantitative simultaneous measurements from fast-response pressure transducers at four tapping point

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Marzocchi, A., D. J. Lunt, R. Flecker, C. D. Bradshaw, A. Farnsworth, and F. J. Hilgen. "Orbital control on late Miocene climate and the North African monsoon: insight from an ensemble of sub-precessional simulations." Climate of the Past Discussions 11, no. 3 (2015): 2181–237. http://dx.doi.org/10.5194/cpd-11-2181-2015.

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Abstract. Orbital forcing is a key climate driver over multi-millennial timescales. In particular, monsoon systems are thought to be driven by orbital cyclicity, especially by precession. Here we analyse the impact of orbital forcing on global climate with a particular focus on the North African monsoon, by carrying out a ensemble of 22 atmosphere-ocean-vegetation simulations, equally-spaced in time and covering one full late Miocene precession cycle (~ 6.5 Ma). Orbital parameters vary realistically for the selected time slice. Our results highlight the high sensitivity of the North African su

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Woillez, M. N., G. Levavasseur, A. L. Daniau, et al. "Impact of precession on the climate, vegetation and fire activity in southern Africa during MIS4." Climate of the Past 10, no. 3 (2014): 1165–82. http://dx.doi.org/10.5194/cp-10-1165-2014.

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Abstract. The relationships between climate, vegetation and fires are a major subject of investigation in the context of climate change. In southern Africa, fire is known to play a crucial role in the existence of grasslands and Mediterranean-type biomes. Microcharcoal-based reconstructions of past fire activity in that region have shown a tight correlation between grass-fueled fires and the precessional cycle, with maximum fire activity during maxima of the climatic precession index. These changes have been interpreted as the result of changes in fuel load in response to precipitation changes

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Woillez, M. N., G. Levavasseur, A. L. Daniau, M. Kageyama, D. H. Urrego, and M. F. Sánchez-Goñi. "Impact of precession on the climate, vegetation and fire activity in southern Africa during MIS4." Climate of the Past Discussions 9, no. 5 (2013): 5391–438. http://dx.doi.org/10.5194/cpd-9-5391-2013.

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Abstract. The relationships between climate, vegetation and fires are a major subject of investigation in the context of climate change. In southern Africa, fire is known to play a crucial role in the existence of grasslands and Mediterranean-like biomes. Microcharcoal-based reconstructions of past fire activity in that region have shown a tight correlation between grass-fueled fires and the precessional cycle, with maximum fire activity during maxima of the climatic precession index. These changes have been interpreted as the result of changes in fuel load in response to precipitation changes

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Barker, A. J. "Nonlinear tidal flows in short-period planets." EAS Publications Series 82 (2019): 43–50. http://dx.doi.org/10.1051/eas/1982004.

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I discuss two related nonlinear mechanisms of tidal dissipation that require finite tidal deformations for their operation: the elliptical instability and the precessional instability. Both are likely to be important for the tidal evolution of short-period extrasolar planets. The elliptical instability is a fluid instability of elliptical streamlines, such as in tidally deformed non-synchronously rotating or non-circularly orbiting planets. I summarise the results of local and global simulations that indicate this mechanism to be important for tidal spin synchronisation, planetary spin-orbit a

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SUN, MOU-YUAN, TONG LIU, WEI-MIN GU, and JU-FU LU. "GRAVITATIONAL RADIATIONS FROM THE PRECESSION CENTRAL ENGINE IN GAMMA-RAY BURSTS." International Journal of Modern Physics: Conference Series 23 (January 2013): 281–83. http://dx.doi.org/10.1142/s201019451301146x.

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The ultra-relativistic precessing jet in gamma-ray bursts (GRBs) may be responsible for the complex structure in GRBs' light curves. In this work, we study the gravitational radiations of jet precession induced by neutrino-dominated accretion disks around black holes. In our model, the jet and the inner part of the disk may precess along with the black hole, which is driven by the outer part of the disk. Gravitational radiations are therefore expected to be significant from this precession system. Based our numerical results, we find that it is possible for DECIGO and BBO to detect such gravit

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Gao, Yong, Lijing Shao, Rui Xu, Ling Sun, Chang Liu, and Ren-Xin Xu. "Triaxially deformed freely precessing neutron stars: continuous electromagnetic and gravitational radiation." Monthly Notices of the Royal Astronomical Society 498, no. 2 (2020): 1826–38. http://dx.doi.org/10.1093/mnras/staa2476.

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ABSTRACT The shape of a neutron star (NS) is closely linked to its internal structure and the equation of state of supranuclear matters. A rapidly rotating, asymmetric NS in the Milky Way undergoes free precession, making it a potential source for multimessenger observation. The free precession could manifest in (i) the spectra of continuous gravitational waves (GWs) in the kilohertz (kHz) band for ground-based GW detectors, and (ii) the timing behaviour and pulse-profile characteristics if the NS is monitored as a pulsar with radio and/or X-ray telescopes. We extend previous work and investig

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Nolting, Chris, Jay Ball, and Tri M. Nguyen. "Simulations of Precessing Jets and the Formation of X-shaped Radio Galaxies." Astrophysical Journal 948, no. 1 (2023): 25. http://dx.doi.org/10.3847/1538-4357/acc652.

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Abstract Jet precession is sometimes invoked to explain asymmetries in radio galaxy (RG) jets and “X/S/Z-shaped” RGs, caused by the presence of a binary black hole companion to the source active galactic nucleus or by accretion instabilities. We present a series of simulations of RG jet precession to examine how these sources would evolve over time, including a passive distribution of cosmic-ray electrons so we can model radio synchrotron emissions and create synthetic radio maps of the sources. We find that a single source viewed from different angles can result in differing RG morphological

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Klein, Ygal Y., and Boaz Katz. "Librating Kozai–Lidov Cycles with a Precessing Quadrupole Potential Are Analytically Approximately Solved." Astronomical Journal 167, no. 2 (2024): 80. http://dx.doi.org/10.3847/1538-3881/ad18b6.

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Abstract The very long term evolution of the hierarchical restricted three-body problem with a slightly aligned precessing quadrupole potential is investigated analytically for librating Kozai–Lidov cycles (KLCs). Klein & Katz presented an analytic solution for the approximate dynamics on a very long timescale developed in the neighborhood of the KLCs' fixed point where the eccentricity vector is close to unity and aligned (or anti-aligned) with the quadrupole axis and for a precession rate equal to the angular frequency of the secular Kozai–Lidov equations around this fixed point. In this

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Hirose, Masahito, and Yoji Osaki. "Superhump Periods in SU Ursae Majoris Stars: Eigenfrequency of the Eccentric Mode of an Accretion Disk." Publications of the Astronomical Society of Japan 45, no. 4 (1993): 595–604. https://doi.org/10.1093/pasj/45.4.595.

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Abstract Superhump periods of SU UMa-type dwarf novae are thought to be given by the synodic (beat) periods between a slowly-precessing eccentric disk and the orbiting secondary star. The precession rate of the eccentric disk in SU UMa stars is formulated as an eigenvalue of the oscillation of the eccentric ( onearmed) mode in the accretion disk. It is shown that the eigenvalue problem is reduced to that of the Sturm-Liouville type and that the precession rate of the eccentric disk is given by the eigenfrequency of the fundamental mode. The eigenfrequency of this mode is examined both analytic

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Weng, Zi-Hua. "Spin angular momentum of proton spin puzzle in complex octonion spaces." International Journal of Geometric Methods in Modern Physics 14, no. 07 (2017): 1750102. http://dx.doi.org/10.1142/s021988781750102x.

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The paper focuses on considering some special precessional motions as the spin motions, separating the octonion angular momentum of a proton into six components, elucidating the proton angular momentum in the proton spin puzzle, especially the proton spin, decomposition, quarks and gluons, and polarization and so forth. Maxwell was the first to use the quaternions to study the electromagnetic fields. Subsequently the complex octonions are utilized to depict the electromagnetic field, gravitational field, and quantum mechanics and so forth. In the complex octonion space, the precessional equili

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de Haas, E. P. J. (Paul). "The geodetic precession as a 3D Schouten precession and a gravitational Thomas precession." Canadian Journal of Physics 92, no. 10 (2014): 1082–93. http://dx.doi.org/10.1139/cjp-2013-0716.

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The Gravity Probe B (GP-B) experiment measured the geodetic precession due to parallel transport in a curved space–time metric, as predicted by de Sitter, Fokker, and Schiff. The Schiff treatment included Thomas precession and argued that it should be zero in a free fall orbit. We review the existing interpretations regarding the relation between the Thomas precession and the geodetic precession for a gyroscope in a free fall orbit. Schiff and Parker had contradictory views on the status of the Thomas precession in a free fall orbit, a contradiction that continues to exist in the literature. I

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MEUNIER, PATRICE, CHRISTOPHE ELOY, ROMAIN LAGRANGE, and FRANÇOIS NADAL. "A rotating fluid cylinder subject to weak precession." Journal of Fluid Mechanics 599 (March 6, 2008): 405–40. http://dx.doi.org/10.1017/s0022112008000335.

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In this paper, we report experimental and theoretical results on the flow inside a precessing and rotating cylinder. Particle image velocimetry measurements have revealed the instantaneous structure of the flow and confirmed that it is the sum of forced inertial (Kelvin) modes, as predicted by the classical linear inviscid theory. But this theory predicts also that the amplitude of a mode diverges when its natural frequency equals the precession frequency. A viscous and weakly nonlinear theory has therefore been developed at the resonance. This theory has been compared to experimental results

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IORIO, LORENZO. "SPIN PRECESSION IN THE DVALI–GABADADZE–PORRATI BRANEWORLD SCENARIO." International Journal of Modern Physics D 15, no. 04 (2006): 469–72. http://dx.doi.org/10.1142/s0218271806008188.

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In this letter, we work out the secular precession of the spin of a gyroscope in geodesic motion around a central mass in the framework of the Dvali–Gabadadze–Porrati multidimensional gravity model. Such an effect, which depends on the mass of the central body and on the orbit radius of the gyroscope, contrary to the precessions of the orbital elements of the orbit of a test body, is far too small to be detected.

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Wasserman, I., J. M. Cordes, S. Chatterjee, and G. Batra. "Nonaxisymmetric Precession of Magnetars and Fast Radio Bursts." Astrophysical Journal 928, no. 1 (2022): 53. http://dx.doi.org/10.3847/1538-4357/ac38a6.

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Abstract The repeating fast radio bursts (FRBs) 180916.J0158 and 121102 are visible during periodically occurring windows in time. We consider the constraints on internal magnetic fields and geometries if the cyclical behavior observed for FRB 180916.J0158 and FRB 121102 is due to the precession of magnetars. In order to frustrate vortex line pinning we argue that internal magnetic fields must be stronger than about 1016 G, which is large enough to prevent superconductivity in the core and destroy the crustal lattice structure. We conjecture that the magnetic field inside precessing magnetars

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Nietz, V. V. "Precessing Ball Solitons in Kinetics of a Spin-Flop Phase Transition." Physics Research International 2011 (July 14, 2011): 1–8. http://dx.doi.org/10.1155/2011/643738.

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The fundamentals of precessing ball solitons (PBS), arising as a result of the energy fluctuations during spin-flop phase transition induced by a magnetic field in antiferromagnets with uniaxial anisotropy, are presented. The PBS conditions exist within a wide range of amplitudes and energies, including negative energies relative to an initial condition. For each value of the magnetic field, there exists a precession frequency for which a curve of PBS energy passes through a zero value (in bifurcation point), and hence, in the vicinity of this point the PBS originate with the highest probabili

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Ol’shanskii, V. Yu. "Regular Precession of a Gyrostat in Three Force Fields." Прикладная математика и механика 87, no. 4 (2023): 571–88. http://dx.doi.org/10.31857/s0032823523040100.

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The article gives a solution to the problem of possible conditions of regular precession in the motion of a gyrostat around a fixed point under the action of two uniform and one inhomogeneous field. For the known case with equal precession and proper rotation velocities, new solutions are indicated with the precession axis deviated from the symmetry axis of the inhomogeneous field. New cases of regular precession are found, when the ratio of precession and proper rotation velocities is equal to two or one second. Application of the results to precession in orthogonal fields and to precession o

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Britzen, Silke, Christian Fendt, Michal Zajaček, et al. "3C 84: Observational Evidence for Precession and a Possible Relation to TeV Emission." Galaxies 7, no. 3 (2019): 72. http://dx.doi.org/10.3390/galaxies7030072.

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3C 84 (NGC 1275, Perseus A) is a bright radio source at the center of an ongoing merger, where HST observations show two colliding spiral galaxies. 3C 84 holds promise to improve our understanding about how of the activity of active galactic nuclei, the formation of supermassive binary black holes, feedback processes, and galaxy collisions are interrelated. 3C,84 is one of only six radio galaxies, which reveal TeV emission. The origin of this TeV emission is still a matter of debate. Our present study is based on high resolution radio interferometric observations (15 GHz) of the pc-scale jet i

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Newton, Alicia. "Precession control." Nature Geoscience 4, no. 12 (2011): 819. http://dx.doi.org/10.1038/ngeo1346.

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Wilczek, Frank. "Precision precession." Nature 410, no. 6824 (2001): 28–29. http://dx.doi.org/10.1038/35065188.

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