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Articles de revues sur le sujet « Minimal curvature strings »

Auteur : Grafiati
Publié le 2 juin 2025
Mis à jour le 31 juillet 2025

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1

Sanchez, N. G. "Advances in String Theory in Curved Backgrounds: A Synthesis Report." International Journal of Modern Physics A 18, no. 12 (2003): 2011–22. http://dx.doi.org/10.1142/s0217751x0301543x.

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A synthetic report of the advances in the study of classical and quantum string dynamics in curved backgrounds is provided, namely : the new feature of Multistring solutions; the mass spectrum of Strings in Curved backgrounds; The effect of a Cosmological Constant and of Spacial Curvature on Classical and Quantum Strings; Classical splitting of Fundamental Strings; The General String Evolution in constant Curvature Spacetimes; The Conformal Invariance Effects; Strings on plane fronted and gravitational shock waves, string falling on spacetime singularities and its spectrum. New Developments in
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2

Kotb, Mahmoud. "Nambu-Goto Strings viaWeierstrass Representation." JOURNAL OF ADVANCES IN PHYSICS 13, no. 4 (2017): 4985–92. http://dx.doi.org/10.24297/jap.v13i6.6245.

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A description of string model of gauge theory are related to minimal surfaces. notations of minimal surface and related mean and Gauss curvature discussed. The Weierstrass representation for a surface conformally which immersed in R used to represent Nambu- Goto action, action of Nambu Goto is calculated usingWeierstrass representation which can be used to calculate the Partion Function and potential, then a non-perturbative solution for action is aimed and fulfilled and a consequences of that are investigated and its mathematical and physical properties are discussed.
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3

ALEXEYEV, S. O., M. V. SAZHIN, and M. V. POMAZANOV. "BLACK HOLES OF A MINIMAL SIZE IN STRING GRAVITY." International Journal of Modern Physics D 10, no. 02 (2001): 225–30. http://dx.doi.org/10.1142/s0218271801000780.

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A lower limit for a neutral black hole size is obtained in the frames of the string gravity model with the second order curvature correction. It is shown that this effect remains when the third order curvature correction is also taken into account and argued that such restriction does exist in all perturbative orders of curvature expansions.
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4

Conzinu, P., G. Fanizza, M. Gasperini, E. Pavone, L. Tedesco, and G. Veneziano. "Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data." Journal of Cosmology and Astroparticle Physics 2025, no. 02 (2025): 039. https://doi.org/10.1088/1475-7516/2025/02/039.

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Abstract We discuss a recently proposed fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in terms of a relic stochastic background of primordial gravitons, produced in the context of the string cosmology pre-big bang scenario. We show that such interpretation cannot be reconciled with a phenomenologically viable minimal version of such scenario, while it can be allowed if one considers an equally viable but generalised, non-minimal version of pre-big bang evolution. Maintaining the S-duality symmetry throughout the high-curva
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5

ABDALLA, E., та A. LIMA-SANTOS. "FACTORIZABLE S-MATRIX FOR $\frac{{\rm SO} (D)}{{\rm SO} (2) \otimes {\rm SO} (D -2)}$ NON-LINEAR σ MODELS WITH FERMIONS". Modern Physics Letters A 03, № 03 (1988): 311–17. http://dx.doi.org/10.1142/s0217732388000374.

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We compute the exact S matrix for the non-linear sigma model with symmetry SO(D)/SO(2)⊗SO(D−2) coupled to fermions in a minimal or supersymmetric way. The model has some relevance in string theory with non-zero external curvature.
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6

Zhang, Binqi, Jingen Deng, Hai Lin, et al. "Study on Erosion Model Optimization and Damage Law of Coiled Tubing." Energies 16, no. 6 (2023): 2775. http://dx.doi.org/10.3390/en16062775.

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Coiled tubing (CT) is used as a velocity string to transport high-velocity gas in drainage gas recovery technology. Sand particles flowing at high speed can cause serious erosion of the pipe wall. Long-term erosion wear leads to the degradation of the string strength and can even cause local perforation. In order to study the erosion wear problem of CT, a gas–solid erosion experimental device was established for a full-size pipe with different radii of curvature. A 3D laser confocal technique was used to examine and characterize the microscopic erosion morphology of the inner wall of the CT. T
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7

Ahmad, Daud, and Bilal Masud. "A Coons Patch Spanning a Finite Number of Curves Tested for Variationally Minimizing Its Area." Abstract and Applied Analysis 2013 (2013): 1–15. http://dx.doi.org/10.1155/2013/645368.

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In surface modeling a surface frequently encountered is a Coons patch that is defined only for a boundary composed offouranalytical curves. In this paper we extend the range of applicability of a Coons patch by telling how to write it for a boundary composed of an arbitrary number of boundary curves. We partition the curves in a clear and natural way into four groups and then join all the curves in each group intooneanalytic curve by using representations of the unit step function including one that isfully analytic. Having a well-parameterized surface, we do some calculations on it that are m
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8

Avis Akbar, Sari Wulandari Hafsari, and Lia Yunita. "Evaluasi Penyimpangan Lintasan Pengeboran Berarah Dan Pengaruhnya Terhadap Pembebanan Drill String pada Sumur “A-A” Lapangan "CPG." Jurnal Offshore: Oil, Production Facilities and Renewable Energy 8, no. 1 (2024): 24–36. https://doi.org/10.30588/jo.v8i1.2015.

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In drilling activities, wellbores inevitably experience deviation, commonly referred to as a crooked hole. If the deviation is significant, the loading on the drill string becomes one of the reasons why drilling does not go as planned and may even fail. The purpose of the research is to determine whether there is a deviation in the drilling path between the planned trajectory and the actual trajectory in well 'A-A' in the CPG field. By evaluating the drilling path deviation, it can be determined whether the load experienced by the drill string exceeds the predefined limits. The Minimum of Curv
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9

D’AURIA, RICCARDO, PIETRO FRE’, GUIDO DE MATTEIS, and IGOR PESANDO. "SUPERSPACE CONSTRAINTS AND CHERN-SIMONS COHOMOLOGY IN D=4 SUPERSTRING EFFECTIVE THEORIES." International Journal of Modern Physics A 04, no. 14 (1989): 3577–613. http://dx.doi.org/10.1142/s0217751x89001412.

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The linear multiplet, composed of the dilaton ϕ, of an antisymmetric gauge field Bμν and of a spinor χ is always present in any superstring induced N=1D=4 supergravity model. We consider its coupling to supergravity using only superspace Bianchi identities and the rheonomy approach. In this way, our results are fully general and independent from the choice of any Lagrangian, a concept which is never mentioned in this paper. We consider two situations corresponding to two different free differential algebras: (1) the case where there are no Chern-Simons terms in the Bμν field strength Hμνρ and
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10

Emmerson, Parker Yaohushuason. "Geometry of Phenomenological Velocity: Energy Numbers, Curvature and Fukaya-Type Categories." May 27, 2025. https://doi.org/10.5281/zenodo.15523017.

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Thank you, Yaohushua for letting me continue to distribute these mathematical gesturing forms so interesting. The paper constructs an algebraic–geometric framework around the “phenomenological ve-locity” expression v = pN/D that arose in previous informal work. We introduce (i) theenergy-number field E, (ii) a non-commutative velocity-string algebra V, (iii) a curvature scalarKPV defined from a “PV–Hessian”, and (iv) a curved A∞ category Fukv (M ) obtained from anordinary Fukaya category by multiplication with v. Basic structural results are proved; se
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11

Andriot, David, Susha Parameswaran, Dimitrios Tsimpis, Timm Wrase, and Ivonne Zavala. "Exponential quintessence: curved, steep and stringy?" Journal of High Energy Physics 2024, no. 8 (2024). http://dx.doi.org/10.1007/jhep08(2024)117.

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Abstract We explore the possibility that our universe’s current accelerated expansion is explained by a quintessence model with an exponential scalar potential, V = V0e−λ ϕ, keeping an eye towards λ ≥ $$ \sqrt{2} $$ 2 and an open universe, favorable to a string theory realisation and with no cosmological horizon. We work out the full cosmology of the model, including matter, radiation, and optionally negative spatial curvature, for all λ > 0, performing an extensive analysis of the dynamical system and its phase space. The minimal physical requirements of a past epoch of radiation dominatio
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12

Suzuki, Ryotaku, and Shinya Tomizawa. "New black ring with all independent conserved charges in five-dimensional minimal supergravity." Physical Review D 110, no. 12 (2024). https://doi.org/10.1103/physrevd.110.124041.

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We present a new exact solution for a general non-BPS black ring in the bosonic sector of five-dimensional minimal supergravity. This obtained solution carries four independent conserved charges: the mass, two angular momenta, an electric charge, and an additional dipole charge related to other charges. By employing the Ehlers-Harrison transformation, we derive this solution by transforming a five-dimensional vacuum solution into a charged solution in the theory. Previously, our work produced a vacuum doubly rotating black ring solution possessing a Dirac-Misner string singularity by using the
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13

Wagner, Fabian L. K. "Towards quantum mechanics on the curved cotangent bundle." Classical and Quantum Gravity, January 8, 2024. http://dx.doi.org/10.1088/1361-6382/ad1c36.

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Abstract The minimal-length paradigm is a cornerstone of quantum gravity phenomenology. Recently, it has been demonstrated that minimal-length quantum mechanics can alternatively be described as an undeformed theory set on a nontrivial momentum space. However, there is no fully consistent formulation of these theories beyond Cartesian coordinates in flat space and, in particular, no position representation. This paper is intended to take the first steps in bridging this gap. Consequently, we find a natural position representation of the position and momentum operators on general curved cotangent
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14

Blitz, Samuel. "Toward a classification of conformal hypersurface invariants." Journal of Mathematical Physics 64, no. 8 (2023). http://dx.doi.org/10.1063/5.0147870.

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Hypersurfaces embedded in conformal manifolds appear frequently as boundary data in boundary-value problems in cosmology and string theory. Viewed as the non-null conformal infinity of a spacetime, we consider hypersurfaces embedded in a Riemannian (or Lorentzian) conformal manifold. We construct a finite and minimal family of hypersurface tensors—the curvatures intrinsic to the hypersurface and the so-called “conformal fundamental forms”—that can be used to construct natural conformal invariants of the hypersurface embedding up to a fixed order in hypersurface-orthogonal derivatives of the bu
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15

De Luca, G. Bruno, Eva Silverstein, and Gonzalo Torroba. "Hyperbolic compactification of M-theory and de Sitter quantum gravity." SciPost Physics 12, no. 3 (2022). http://dx.doi.org/10.21468/scipostphys.12.3.083.

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We present a mechanism for accelerated expansion of the universe in the generic case of negative-curvature compactifications of M-theory, with minimal ingredients. M-theory on a hyperbolic manifold with small closed geodesics supporting Casimir energy -- along with a single classical source (7-form flux) -- contains an immediate 3-term structure for volume stabilization at positive potential energy. Hyperbolic manifolds are well-studied mathematically, with an important rigidity property at fixed volume. They and their Dehn fillings to more general Einstein spaces exhibit explicit discrete par
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16

Oikonomou, V. K., Ardit Gkioni, Iason Sdranis, Pyotr Tsyba, and Olga Razina. "Rescaled Einstein-Gauss-Bonnet Gravity Inflation." Classical and Quantum Gravity, March 14, 2025. https://doi.org/10.1088/1361-6382/adc0dc.

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Abstract We study the inflationary phenomenology of a rescaled
Einstein-Gauss-Bonnet gravity. In this framework, the
gravitational constant of the Einstein-Hilbert term is rescaled
due to effective terms active in the high curvature era.
Basically, the total theory is an $F(R,G,\phi)$ theory with the
Gauss-Bonnet part contributing only a non-minimal coupling to the
scalar field, so it is a theory with string theory origins and
with a non-trivial $F(R)$ gravity part. The $F(R)$ gravity part in
the high curvature regime contributes
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17

Suzuki, Ryotaku, and Shinya Tomizawa. "Nonuniqueness of capped black holes: Large and small bubbles." Physical Review D 111, no. 6 (2025). https://doi.org/10.1103/physrevd.111.064066.

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We present a new non-BPS solution describing an asymptotically flat, stationary, biaxisymmetric capped black hole in the bosonic sector of five-dimensional minimal supergravity. This solution describes a spherical black hole, while the exterior region of the horizon exhibits a nontrivial topology of [R4#CP2]\B4 on a time slice. This solution extends our previously constructed three-parameter solution to a more general four-parameter solution. To derive this solution, we utilize a combination of the Ehlers and Harrison transformations and then impose appropriate boundary conditions on the solut
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18

Suzuki, Ryotaku, and Shinya Tomizawa. "Solution generation of a capped black hole." Physical Review D 110, no. 2 (2024). http://dx.doi.org/10.1103/physrevd.110.024026.

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Utilizing the electric Harrison transformation developed in five-dimensional minimal supergravity, we construct an exact solution characterizing non-BPS (Bogomol’nyi-Prasad-Sommerfield) charged rotating black holes with a horizon cross section of a lens space L(n;1). Among these solutions, only the ones corresponding to n=0 and n=1 do not have any curvature singularities, conical singularities, Dirac-Misner string singularities, and orbifold singularities both on and outside the horizon; additionally, they are free from closed timelike curves. The solution for n=0 corresponds to the charged di
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19

Wu, Chen-Hao, Ya-Peng Hu, and Hao Xu. "Hawking evaporation of Einstein–Gauss–Bonnet AdS black holes in $$D\geqslant 4$$ dimensions." European Physical Journal C 81, no. 4 (2021). http://dx.doi.org/10.1140/epjc/s10052-021-09140-6.

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AbstractEinstein–Gauss–Bonnet theory is a string-generated gravity theory when approaching the low energy limit. By introducing the higher order curvature terms, this theory is supposed to help to solve the black hole singularity problem. In this work, we investigate the evaporation of the static spherically symmetric neutral AdS black holes in Einstein–Gauss–Bonnet gravity in various spacetime dimensions with both positive and negative coupling constant $$\alpha $$ α . By summarizing the asymptotic behavior of the evaporation process, we find the lifetime of the black holes is dimensional dep
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