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Journal articles on the topic 'Vacua configuration'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATIONS BY QUARTIC SUPERPOTENTIAL FOR BIFUNDAMENTALS." International Journal of Modern Physics A 24, no. 30 (2009): 5697–724. http://dx.doi.org/10.1142/s0217751x09044711.

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The type IIA nonsupersymmetric meta-stable brane configuration consisting of three NS5-branes, D4-branes and anti-D4-branes where the electric gauge theory superpotential has a quartic term for the bifundamentals besides a mass term is constructed. By adding the orientifold 4-plane and 6-plane to this brane configuration, we also describe the intersecting brane configurations of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of corresponding gauge theories.

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2

Bellucci, Stefano, and Bhupendra Nath Tiwari. "Thermodynamic Geometry of Yang–Mills Vacua." Universe 5, no. 4 (2019): 90. http://dx.doi.org/10.3390/universe5040090.

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We study vacuum fluctuation properties of an ensemble of S U ( N ) gauge theory configurations, in the limit of many colors, viz. N c → ∞ , and explore the statistical nature of the topological susceptibility by analyzing its critical behavior at a non-zero-vacuum parameter θ and temperature T. We find that the system undergoes a vacuum phase transition at the chiral symmetry restoration temperature as well as at an absolute value of θ . On the other hand, the long-range correlation length solely depends on θ for the theories with critical exponent e = 2 or T = T d + 1 , where T d is the decoh

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3

KAWAI, HIKARU, and MATSUO SATO. "PERTURBATIVE VACUA FROM IIB MATRIX MODEL." International Journal of Modern Physics A 23, no. 14n15 (2008): 2279–80. http://dx.doi.org/10.1142/s0217751x08041086.

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It has not been clarified whether a matrix model can describe various vacua of string theory. In this talk, we show that the IIB matrix model includes type IIA string theory1. In the naive large N limit of the IIB matrix model, configurations consisting of simultaneously diagonalizable matrices form a moduli space, although the unique vacuum would be determined by complicated dynamics. This moduli space should correspond to a part of perturbatively stable vacua of string theory. Actually, one point on the moduli space represents type IIA string theory. Instead of integrating over the moduli sp

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Pimentel, Guilherme L., Alexander M. Polyakov, and Grigory M. Tarnopolsky. "Vacua on the Brink of Decay." Reviews in Mathematical Physics 30, no. 07 (2018): 1840013. http://dx.doi.org/10.1142/s0129055x18400135.

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We consider free massive matter fields in static scalar, electric and gravitational backgrounds. Tuning these backgrounds to the brink of vacuum decay, we identify a term in their effective action that is singular. This singular term is universal, being independent of the features of the background configuration. In the case of gravitational backgrounds, it can be interpreted as a quantum mechanical analog of Choptuik scaling. If the background is tuned slightly above the instability threshold, this singular term gives the leading contribution to the vacuum decay rate. Dedicated to the memory

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5

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATIONS BY HIGHER-ORDER POLYNOMIAL SUPERPOTENTIAL." International Journal of Modern Physics A 24, no. 28n29 (2009): 5495–521. http://dx.doi.org/10.1142/s0217751x0904470x.

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We construct the type IIA nonsupersymmetric meta-stable brane configuration consisting of (2k+1) NS5-branes and D4-branes where the electric gauge theory superpotential has an order (2k+2) polynomial for the bifundamentals. We find a rich pattern of nonsupersymmetric meta-stable states as well as the supersymmetric stable ones. By adding the orientifold 4-plane to this brane configuration, we also describe the intersecting brane configuration of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of corresponding gauge theory.

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6

BELLUCCI, STEFANO, and BHUPENDRA NATH TIWARI. "SCALAR MODULI, WALL CROSSING AND PHENOMENOLOGICAL PREDICTIONS." Modern Physics Letters A 27, no. 27 (2012): 1250155. http://dx.doi.org/10.1142/s0217732312501556.

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We present the scalar moduli stabilization from the perspective of the real intrinsic geometry. In this paper, we describe the physical nature of the vacuum moduli fluctuations of an arbitrary Fayet configuration. For finitely many Abelian scalar fields, we show that the framework of the real intrinsic geometry investigates the mixing between the marginal and threshold vacua. Interestingly, we find that the phenomena of wall crossing and the search of the stable vacuum configurations, pertaining to D-term and F-term scalar moduli, can be accomplished for the Abelian charges. For given vacuum e

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7

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATION AND GAUGED FLAVOR SYMMETRY." Modern Physics Letters A 22, no. 31 (2007): 2329–41. http://dx.doi.org/10.1142/s0217732307024346.

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Starting from an [Formula: see text] supersymmetric electric gauge theory with the gauge group Sp (N c ) × SO (2N′ c ) with fundamentals for the first gauge group factor and a bifundamental, we apply Seiberg dual to the symplectic gauge group only and arrive at the [Formula: see text] supersymmetric dual magnetic gauge theory with dual matters including the gauge singlets and superpotential. By analyzing the F-term equations of the dual magnetic superpotential, we describe the intersecting brane configuration of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of

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8

GREEN, PAUL S., and TRISTAN HÜBSCH. "SPACE-TIME VARIABLE SUPERSTRING VACUA (CALABI-YAU COSMIC YARN)." International Journal of Modern Physics A 09, no. 18 (1994): 3203–27. http://dx.doi.org/10.1142/s0217751x94001266.

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In a general superstring vacuum configuration, the “internal” space (sector) varies in space-time. When this variation is nontrivial only in two spacelike dimensions, the vacuum contains static cosmic strings with finite energy per unit length and which is, up to interactions with matter, an easily computed topological invariant. The total space-time is smooth although the “internal” space is singular at the center of each cosmic string. In a similar analysis of the Wick-rotated Euclidean model, these cosmic strings acquire expected self-interactions. Also, a possibility emerges to define a gl

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9

BENDER, M., T. DUGUET, P. H. HEENEN, and D. LACROIX. "REGULARIZATION OF MULTI-REFERENCE ENERGY DENSITY FUNCTIONAL CALCULATIONS." International Journal of Modern Physics E 20, no. 02 (2011): 259–69. http://dx.doi.org/10.1142/s0218301311017600.

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We report the first application of a recently proposed regularization procedure for multi-reference energy density functionals, which removes spurious divergent or non-continuous contributions to the binding energy, to a general configuration mixing. As an example, we present a calculation that corresponds to the particle-number and angular momentum projection of axially symmetric time-reversal invariant quasiparticle vacua of different quadrupole deformation for the nucleus 18 O . The SIII parameterization of the Skyrme energy functional is used.

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10

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATIONS WITH MULTIPLE NS5-BRANES." International Journal of Modern Physics A 24, no. 27 (2009): 5051–120. http://dx.doi.org/10.1142/s0217751x09045923.

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Starting from an [Formula: see text] supersymmetric electric gauge theory with the multiple product gauge group and the bifundamentals, we apply Seiberg dual to each gauge group, obtain the [Formula: see text] supersymmetric dual magnetic gauge theories with dual matters including the gauge singlets. Then we describe the intersecting brane configurations, where there are NS-branes and D4-branes (and anti-D4-branes), of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of this gauge theory. We also discuss the case where the orientifold 4-planes are added into the

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11

YOKOYAMA, JUN'ICHI. "VACUUM SELECTION BY INFLATION AS THE ORIGIN OF THE DARK ENERGY." International Journal of Modern Physics D 11, no. 10 (2002): 1603–8. http://dx.doi.org/10.1142/s0218271802002967.

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I propose a new mechanism to account for the observed tiny but finite dark energy in terms of a non-Abelian Higgs theory, which has infinitely many perturbative vacua characterized by a winding number, in the framework of inflationary cosmology. Inflation homogenizes field configuration and practically realizes a perturbative vacuum with vanishing winding number, which is expressed by a superposition of eigenstates of the Hamiltonian with different vacuum energy density. As a result, we naturally find a nonvanishing vacuum energy density with fairly large probability, under the assumption that

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12

Yang, Weihua. "Parity-odd parton distribution functions from 𝜃-vacuum". International Journal of Modern Physics A 34, № 26 (2019): 1950145. http://dx.doi.org/10.1142/s0217751x19501458.

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Quantum chromodynamics is a fundamental non-Abelian gauge theory of strong interactions. The physical quantum chromodynamics vacuum state is a linear superposition of the [Formula: see text]-vacua states with different topological numbers. Because of the configuration of the gauge fields, the tunneling events can induce the local parity-odd domains. Those interactions that occur in these domains can be affected by these effects. Considering the hadron (nucleon) system, we introduce the parity-odd parton distribution functions in order to describe the parity-odd structures inside the hadron in

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13

HERRERA-AGUILAR, ALFREDO. "CHARGING INTERACTING ROTATING BLACK HOLES IN HETEROTIC STRING THEORY." Modern Physics Letters A 19, no. 30 (2004): 2299–315. http://dx.doi.org/10.1142/s0217732304015117.

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We present a formulation of the stationary bosonic string sector of the whole toroidally compactified effective field theory of the heterotic string as a double Ernst system which, in the framework of general relativity describes, in particular, a pair of interacting spinning black holes; however, in the framework of low-energy string theory the double Ernst system can in particular be interpreted as the rotating field configuration of two interacting sources of black hole type coupled to dilaton and Kalb–Ramond fields. We clarify the rotating character of the Btφ-component of the antisymmetri

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14

Lucini, Biagio, Olmo Francesconi, Markus Holzmann, David Lancaster, and Antonio Rago. "Efficient computations of continuous action densities of states for lattice models." Journal of Physics: Conference Series 2207, no. 1 (2022): 012052. http://dx.doi.org/10.1088/1742-6596/2207/1/012052.

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Abstract The Logarithmic Linear Relaxation (LLR) algorithm is an efficient method for computing densities of states for systems with a continuous spectrum. A key feature of this method is exponential error reduction, which allows us to evaluate the density of states of a system over hundreds of thousands of orders of magnitude with a fixed level of relative accuracy. As a consequence of exponential error reduction, the LLR method provides a robust alternative to traditional Monte Carlo calculations in cases in which states suppressed by the Boltzmann weight play nevertheless a relevant role, e

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15

VARGAS MONIZ, P. "SPHERICALLY SYMMETRIC GRAVITATIONAL FIELDS: BLACK HOLES AND MIDISUPERSPACE QUANTIZATION NEAR THE APPARENT HORIZON." International Journal of Modern Physics A 17, no. 18 (2002): 2459–83. http://dx.doi.org/10.1142/s0217751x02009941.

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The purpose of this paper is to investigate the quantum vacua directly implied by the wave function of a gravitational configuration characterized by the presence of an apparent horizon, namely the Vaidya space–time solution. Spherical symmetry is a main feature of this configuration, with a scalar field constituting a source [a Klein–Gordon geon or Berger–Chitre–Moncrief–Nutku (BCMN) type model]. The subsequent analysis requires solving a Wheeler–DeWitt equation near the apparent horizon (following the guidelinesintroduced by A. Tomimatsu,18; M. Pollock,19 and developed by A. Hosoya and I. Od

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16

Franco, Sebastián, Iñaki Garcia-Etxebarria, and Angel M. Uranga. "Non-supersymmetric meta-stable vacua from brane configurations." Journal of High Energy Physics 2007, no. 01 (2007): 085. http://dx.doi.org/10.1088/1126-6708/2007/01/085.

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17

HU, SEN, ZHI HU, and RUORAN ZHANG. "GENERALIZED RICCI FLOW AND SUPERGRAVITY VACUUM SOLUTIONS." International Journal of Modern Physics A 25, no. 12 (2010): 2535–49. http://dx.doi.org/10.1142/s0217751x10048238.

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We first give a proof that the supersymmetric configurations satisfy the equations of motion for type II supergravity. In flux compactifications, the string vacua preserving N = 2 supersymmetry are the twisted generalized Calabi–Yau manifold. The modulus space of the string vacua can be constructed. We discuss the generalized Dirac operator which adds a torsional term to the ordinary Dirac operator and compute its index by the path integral method. Via the variation of the action of supergravity one can introduce the generalized Ricci flow equations. We consider deforming the manifold with the

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18

Ahn, Changhyun. "Brane configurations for nonsupersymmetric meta-stable vacua in SQCD with adjoint matter." Classical and Quantum Gravity 24, no. 5 (2007): 1359–70. http://dx.doi.org/10.1088/0264-9381/24/5/017.

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19

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATIONS WITH FIVE NS5-BRANES." International Journal of Modern Physics A 24, no. 28n29 (2009): 5465–93. http://dx.doi.org/10.1142/s0217751x09044723.

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From an [Formula: see text] supersymmetric electric gauge theory with the gauge group SU (Nc) × SU (N′c) with fundamentals for each gauge group, the bifundamentals and a symmetric flavor and a conjugate symmetric flavor for SU (Nc), we apply Seiberg dual to each gauge group independently and obtain two [Formula: see text] supersymmetric dual magnetic gauge theories with dual matters including the gauge singlets. By analyzing the F-term equations of the dual magnetic superpotentials, we describe the intersecting brane configurations of type IIA string theory corresponding to the meta-stable non

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20

Gillard, Mike, and Paul Sutcliffe. "Domain walls and double bubbles." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2109 (2009): 2911–25. http://dx.doi.org/10.1098/rspa.2009.0227.

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We study configurations of intersecting domain walls in a Wess–Zumino model with three vacua. We introduce a volume-preserving flow and show that its static solutions are configurations of intersecting domain walls that form double bubbles, that is, minimal area surfaces which enclose and separate two prescribed volumes. To illustrate this field theory approach to double bubbles, we use domain walls to reconstruct the phase diagram for double bubbles in the flat square two-torus and also construct all known examples of double bubbles in the flat cubic three-torus.

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21

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATIONS OF TRIPLE PRODUCT GAUGE GROUPS." International Journal of Modern Physics A 24, no. 25n26 (2009): 4869–922. http://dx.doi.org/10.1142/s0217751x09045935.

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From an [Formula: see text] supersymmetric electric gauge theory with the gauge group [Formula: see text] with fundamentals for each gauge group and the bifundamentals, we apply Seiberg dual to each gauge group and obtain the [Formula: see text] supersymmetric dual magnetic gauge theories with dual matters including the additional gauge singlets. By analyzing the F-term equations of the dual magnetic superpotentials, we describe the intersecting brane configurations of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of this gauge theory. We apply also to the cas

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22

Alvira, Elena. "Molecular Simulation of the Separation of Isoleucine Enantiomers by β-Cyclodextrin". Molecules 24, № 6 (2019): 1021. http://dx.doi.org/10.3390/molecules24061021.

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Molecular mechanics and dynamics simulations were carried out to study the capacity of isoleucine enantiomers to form inclusion complexes with β–cyclodextrin, and to be discriminated by this chiral compound, in vacuo and with different solvents. Solvents were characterized not only by the value of dielectric constant ε in the Coulombic interaction energy, but also by the neutral and zwitterion configurations of isoleucine. Whereas the discrimination between the enantiomers for ε ≤ 2 is due to the electrostatic contribution, these differences are mainly due to the Lennard-Jones potential for ε

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23

ELITZUR, SHMUEL, AMIT GIVEON, DAVID KUTASOV, ELIEZER RABINOVICI, and GOR SARKISSISAN. "D-BRANES IN THE BACKGROUND OF NS FIVEBRANES." International Journal of Modern Physics A 16, no. 05 (2001): 880–90. http://dx.doi.org/10.1142/s0217751x01003962.

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We study the dynamics of D-branes in the near-horizon geometry of NS fivebranes. This leads to a holographically dual description of the physics of D-branes ending on and/or intersecting NS5-branes. We use it to verify some properties of such D-branes which were deduced indirectly in the past, and discuss some instabilities of non-supersymmetric brane configurations. Our construction also describes vacua of Little String Theory which are dual to open plus closed string theory in asymptotically linear dilaton spacetimes.

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24

Sidharth, B. G., C. R. Das, L. V. Laperashvili, and H. B. Nielsen. "Gravi-weak unification and the black-hole-hedgehog’s solution with magnetic field contribution." International Journal of Modern Physics A 33, no. 32 (2018): 1850188. http://dx.doi.org/10.1142/s0217751x18501889.

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In the present paper, we investigated the gravitational black-hole-hedgehog’s solution with magnetic field contribution in the framework of the [Formula: see text]-gravity described by the Gravi-weak unification (GWU) model. Assuming the Multiple Point Principle (MPP), we considered the existence of the two degenerate vacua of the Universe: the first Electroweak (EW)-vacuum with [Formula: see text] GeV (“true vacuum”), and the second Planck scale (“false vacuum”) with [Formula: see text] GeV. In these vacua, we investigated different topological defects. The main aim of this paper is an invest

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25

Park, Eun Kyung, and Pyung Seong Kwon. "A torsion-free background solution of the string theory." International Journal of Geometric Methods in Modern Physics 16, no. 05 (2019): 1950079. http://dx.doi.org/10.1142/s0219887819500798.

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We find a background solution of the string theory which has a special property distinguished from the usual background solutions. This background solution does not produce the NS-NS two-form fields under T-duality and therefore the background vacua described by this solution essentially do not involve NS-NS type branes in their configurations, unlike the case of the ordinary Calabi–Yau ansatz. As a result the non-linear [Formula: see text]-models, whose target space metrics are given by these T-dual partners, can both be torsion-free.

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26

Espinosa, J. R., and J. Huertas. "Pseudo-bounces vs. new instantons." Journal of Cosmology and Astroparticle Physics 2021, no. 12 (2021): 029. http://dx.doi.org/10.1088/1475-7516/2021/12/029.

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Abstract Some false vacua do not decay via bounces. This usually happens when a flat direction of the tunneling action due to scale invariance is lifted to a sloping valley by a scale breaking perturbation, pushing the bounce off to infinity. We compare two types of alternative decay configurations that have been proposed recently to describe decay in such cases: pseudo-bounces and new instantons. Although both field configurations are quite similar, we find that the pseudo-bounce action is lower than the new instanton one and describes more faithfully the bottom of the action valley. In addit

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27

AHN, CHANGHYUN. "META-STABLE BRANE CONFIGURATIONS OF MULTIPLE PRODUCT GAUGE GROUPS WITH ORIENTIFOLD 6 PLANE." International Journal of Modern Physics A 24, no. 25n26 (2009): 4805–68. http://dx.doi.org/10.1142/s0217751x09045959.

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Starting from an [Formula: see text] supersymmetric electric gauge theory with the gauge group [Formula: see text] with fundamentals for each gauge group, the bifundamentals, a symmetric flavor and a conjugate symmetric flavor for SU (Nc), we apply Seiberg dual to each gauge group, obtain the [Formula: see text] supersymmetric dual magnetic gauge theories with dual matters including the gauge singlets, and describe the intersecting brane configurations of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of this gauge theory. We also discuss the case where a symme

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28

Sidharth, B. G., C. R. Das, L. V. Laperashvili, and H. B. Nielsen. "Gravitational black-holes-hedgehogs and two degenerate vacua of the Universe." International Journal of Modern Physics D 27, no. 03 (2018): 1850022. http://dx.doi.org/10.1142/s0218271818500220.

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In the present paper, assuming the Multiple Point Principle (MPP) as a new law of Nature, we considered the existence of the two degenerate vacua of the Universe: the first Electroweak (EW) vacuum at [Formula: see text][Formula: see text]GeV — “true vacuum”, and the second Planck scale “false vacuum” at [Formula: see text] GeV. In these vacua, we investigated different topological defects. The main aim of this paper is an investigation of the black-hole-hedgehogs configurations as defects of the false vacuum. In the framework of the [Formula: see text] gravity, described by the Gravi-Weak unif

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29

Das, C., L. Laperashvili, H. Nielsen, and B. Sidharth. "Explaining Defects of the Universal Vacua with Black Holes-Hedgehogs and Strings." Universe 5, no. 3 (2019): 78. http://dx.doi.org/10.3390/universe5030078.

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Assuming the Multiple Point Principle (MPP) as a new law of Nature, we considered the existence of the two degenerate vacua of the Universe: (a) the first Electroweak (EW) vacuum at v 1 ≈ 246 GeV—“true vacuum”, and (b) the second Planck scale “false vacuum” at v 2 ∼ 10 18 GeV. In these vacua, we investigated different topological defects. The main aim of the paper is an investigation of the black-hole-hedgehogs configurations as defects of the false vacuum. In the framework of the f ( R ) gravity, described by the Gravi-Weak unification model, we considered a black-hole solution, which corresp

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30

DAS, SUMIT R., AVINASH DHAR, and SPENTA R. WADIA. "CRITICAL BEHAVIOR IN TWO-DIMENSIONAL QUANTUM GRAVITY AND EQUATIONS OF MOTION OF THE STRING." Modern Physics Letters A 05, no. 11 (1990): 799–813. http://dx.doi.org/10.1142/s0217732390000895.

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We show how consistent quantization determines the renormalization of couplings in a quantum field theory coupled to gravity in two dimensions. The special status of couplings corresponding to conformally invariant matter is discussed. In string theory, where the dynamical degree of freedom of the two-dimensional metric plays the role of time in target space, these renormalization group equations are themselves the classical equations of motion. Time independent solutions, like classical vacuua, correspond to the situation in which matter is conformally invariant. Time dependent solutions, lik

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31

STARIKOV, E. B., J. P. LEWIS, and O. F. SANKEY. "BASE SEQUENCE EFFECTS ON CHARGE CARRIER GENERATION IN DNA: A THEORETICAL STUDY." International Journal of Modern Physics B 19, no. 29 (2005): 4331–57. http://dx.doi.org/10.1142/s0217979205032802.

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We have thoroughly analyzed the electronic structure of stacked DNA Watson–Crick (WC) base pair dimers using ab initio Hartree–Fock and semiempirical Hartree–Fock-configuration-interaction quantum chemistry. We consider all the possible base compositions and sequences at the nucleoside level in vacuo. The results show that in such systems charge carrier generation could in principle be possible via charge transfer excitons, which turn out to dominate the first excited electronic states of the WC base pairs and their stacked dimers, and this process is largely sequence- and conformation-depende

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Nielsen, Steen Brøndsted, Mogens Brøndsted Nielsen, and Angel Rubio. "Spectroscopy of Nitrophenolates in Vacuo: Effect of Spacer, Configuration, and Microsolvation on the Charge-Transfer Excitation Energy." Accounts of Chemical Research 47, no. 4 (2014): 1417–25. http://dx.doi.org/10.1021/ar500025h.

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Zarechnaya, O. M., and V. A. Mikhailov. "Multiple Noncovalent Binding in the Intermediates and Products of the Reaction of <i>N,N</i>-Dimethylformamide with Bromine." Журнал общей химии 94, no. 1 (2024): 10–28. http://dx.doi.org/10.31857/s0044460x24010022.

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Reaction of nonionic N,N-dimethylformamide (DMF) with bromine under controllable conditions leads to a number of ionic compounds, mainly to bis(N,N-dimethylformamide)hydrogen dibromobromate. Computations with DFT (ωB97xV/dgdzvp) were made for geometry, thermochemistry and electron configuration of products and supposed intermediates. Two labile particles [bis(N,N-dimethylformamide)hydrogen cation and dibromobromate-anion] form stable highly conductive ionic liquid that can be distilled in vacuo without losses or decomposition. A number of molecular complexes of DMF with bromine and water presu

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Arano Lean, Milagros. "Rebels on trial! The configuration of the enemy in the Comentarios of Álvar Núñez Cabeza de Vaca." Nuevas de Indias. Anuario del CEAC 2 (December 22, 2017): 1. http://dx.doi.org/10.5565/rev/nueind.22.

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MATUTE, ERNESTO A. "ELECTROWEAK QUARK–LEPTON SYMMETRY AND WEAK TOPOLOGICAL-CHARGE CONFINEMENT IN THE STANDARD MODEL WITH DIRAC NEUTRINOS." International Journal of Modern Physics A 22, no. 21 (2007): 3669–91. http://dx.doi.org/10.1142/s0217751x0703683x.

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The standard electroweak model with Dirac neutrinos is extended by way of the principles of electroweak quark–lepton symmetry and weak topological-charge confinement to account for quark–lepton charge relations which, if not accidental, are indicative of charge structures. A mixing in quarks and leptons of underlying integer local charges with integer weak topological charges associated with an additive group Z3, fixed by the anomaly cancellation requirement, is discussed. It is found that the electroweak difference between topological quarks and leptons is the nonequivalence between the topol

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36

Montiel, F., L. G. Bennetts, V. A. Squire, F. Bonnefoy, and P. Ferrant. "Hydroelastic response of floating elastic discs to regular waves. Part 2. Modal analysis." Journal of Fluid Mechanics 723 (April 16, 2013): 629–52. http://dx.doi.org/10.1017/jfm.2013.124.

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AbstractValidation of a linear numerical model of wave interactions with floating compliant discs is sought using data obtained from the wave basin experiments reported in Part 1 (Montiel et al. J. Fluid Mech., vol. 723, 2013, pp. 604–628). Comparisons are made for both single-disc tests and the two-disc tests in which wave interactions between discs are observed. The deflection of the disc or discs is separated into the natural modes of vibration in vacuo. The decomposition allows the rigid-body motions and flexural motions to be analysed separately. Rigid-body motions are accurately replicat

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37

Douglas, Michael R. "The String Theory Landscape." Universe 5, no. 7 (2019): 176. http://dx.doi.org/10.3390/universe5070176.

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String/M theory is formulated in 10 and 11 space-time dimensions; in order to describe our universe, we must postulate that six or seven of the spatial dimensions form a small compact manifold. In 1985, Candelas et al. showed that by taking the extra dimensions to be a Calabi–Yau manifold, one could obtain the grand unified theories which had previously been postulated as extensions of the Standard Model of particle physics. Over the years since, many more such compactifications were found. In the early 2000s, progress in nonperturbative string theory enabled computing the approximate effectiv

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Raczyńska, Ewa Daniela. "On Some Origins of Tautomeric Preferences in Neutral Creatinine in Vacuo: Search for Analogies and Differences in Cyclic Azoles and Azines." Symmetry 16, no. 1 (2024): 98. http://dx.doi.org/10.3390/sym16010098.

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In order to look for the origins of tautomeric preferences in neutral creatinine in vacuo, we examined prototropic conversions for model azoles, namely mono-hydroxy and mono-amino imidazoles, and also for their selected 1-methyl derivatives. All possible isomeric forms of creatinine and model compounds, resulting from intramolecular proton transfer (prototropy), conformational isomerism about –OH, and configurational isomerism about =NH, were studied in the gas phase (model of non-polar environment) by means of quantum-chemical methods. Because the bond-length alternation is a consequence of t

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Sondak, E., M. Perl, and D. Pnueli. "The Dynamic Response to Impact Loading of a Fluid-Supported Rectangular Plate." Journal of Vibration and Acoustics 111, no. 4 (1989): 423–29. http://dx.doi.org/10.1115/1.3269878.

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This work considers the elastodynamic response of a rectangular plate supported by a fluid on one side, and subjected to impact loading on the other side. The presence of the fluid in our problem has the effect, first, of lowering the natural frequency of the plate due to the increased inertia, and secondly, of damping its vibrations owing to the energy carried off in the form of sound waves. The deflection of the plate is approximated by a double infinite series in the spatial coordinates. Each term of the series consists of a product of two modes of deflection of beams, having the same bound

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Budesinsky, Milos, Ivana Cisarova, Jaroslav Podlaha, et al. "Structures of cyclic dipeptides: an X-ray and computational study of cis- and trans-cyclo(Pip-Phe), cyclo(Pro-Phe) and their N-methyl derivatives." Acta Crystallographica Section B Structural Science 66, no. 6 (2010): 662–77. http://dx.doi.org/10.1107/s0108768110040243.

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The crystal structures of eight cyclodipeptides are determined, incorporating pipecolic acid or proline and phenylalanine or N-methyl phenylalanine. This set of structures allows the evaluation of the effects on molecular conformation and crystal packing of imino acid ring-size, relative configuration of the two amino acids, and N-methylation. In the non-methylated compounds, hydrogen-bonding interactions form one-dimensional motifs that dominate the packing arrangement. Three compounds have more than one symmetry-independent molecule in the asymmetric unit (Z′ > 1), indicative of a broad a

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Goudjil, Meriem, Enrique Gutiérrez-Puebla, Paola Bonazzi, Eugenio Lunedei, Djillali Mezaoui, and Luca Bindi. "Synthesis and crystal structure of a series of stoichiometric (n)-ITB molybdenum-bronze oxides containing trivalent arsenic." Zeitschrift für Kristallographie - Crystalline Materials 234, no. 9 (2019): 569–79. http://dx.doi.org/10.1515/zkri-2019-0018.

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Abstract A series of six new single crystals of fully stoichiometric As3+-bearing Mo-oxides and partially W-substituted Mo-oxides with formula AsmO(Mo1−xWxO3)p (m = 1, 2; p = 5, 7, 9, 10 and 11 and 0 ≤ x ≤ 0.6) was successfully grown using vapor-phase transport in vacuo. The crystal structures were determined using single-crystal X-ray diffraction data. All these compounds exhibit acentric orthorhombic symmetry with Z = 2, and belong to the so-called (n)-ITB (intergrowth tungsten bronzes) family, with n = 2, 3, 4 and 5. The six (n)-ITB phases have the following formulae: (2)-AsMo5O16 (Pm 2a),

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Phelps, Geoff. "Forward modeling of gravity data using geostatistically generated subsurface density variations." GEOPHYSICS 81, no. 5 (2016): G81—G94. http://dx.doi.org/10.1190/geo2015-0663.1.

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Using geostatistical models of density variations in the subsurface, constrained by geologic data, forward models of gravity anomalies can be generated by discretizing the subsurface and calculating the cumulative effect of each cell (pixel). The results of such stochastically generated forward gravity anomalies can be compared with the observed gravity anomalies to find density models that match the observed data. These models have an advantage over forward gravity anomalies generated using polygonal bodies of homogeneous density because generating numerous realizations explores a larger regi

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Rauk, A., D. A. Armstrong, and J. Berges. "Glutathione radical: Intramolecular H abstraction by the thiyl radical." Canadian Journal of Chemistry 79, no. 4 (2001): 405–17. http://dx.doi.org/10.1139/v01-063.

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Ab initio computations (B3LYP/6-31G(D)) were used to predict transition structures and energies of activation for intramolecular H atom transfer to a thiyl radical (RS.) from the α-CH bonds of glutathione (1) and from the model compounds, N-formylcysteinylglycine (2) and N-(2-thioethanyl)-γ-glutamine (3). For each compound, transition structures were located by in vacuo calculations on the neutral non-zwitterionic system. Thermodynamic functions derived at the same level and single point calculations at the B3LYP/6-311+G(3df,2p) level, were used to derive free energies of activation (ΔG[Formu

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Saad, A. J., Triyono Triyono, A. Supriyanto, N. Muhayat, and Z. Yuliadi. "Effect of Holding Time on the Diffusion Behavior at Interface of Dissimilar Metals Joint between Aluminum and Carbon Steel Joint Using Element Promoter." Modern Applied Science 8, no. 5 (2014): 1. http://dx.doi.org/10.5539/mas.v8n5p1.

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Holding time is used for optimizing the bond diffusion between aluminum Al and Carbon steel SS400. The objective of this research was to investigate the effects of holding time on the interface reactions of diffusion welding between aluminum and carbon steel. Holding time variations of 10, 15, 30 and 45 minutes were applied at 950°C using mixture of Cu and Fe powder as elements promoter. Single lap joint configuration was performed in vacum furnace to join the dissimilar materials which allowed bonding diffusion. Microstructure was examined on the same test piece. It was found that during diff

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TIWARY, AMIT S., PARTHA SARATHI SENGUPTA, and ASOK K. MUKHERJEE. "MODELING THE GROUND STATE GEOMETRY AND ESTIMATING THE CHARGE TRANSFER TRANSITION ENERGY OF THE TOLUENE–ICl MOLECULAR COMPLEX BY AB INITIO AND DFT METHODS." Journal of Theoretical and Computational Chemistry 07, no. 03 (2008): 331–46. http://dx.doi.org/10.1142/s0219633608003782.

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Out of several plausible isomeric structures of the toluene–ICl charge transfer (CT) complex, the most feasible one was determined by a detailed ab initio and DFT study at the HF, B3LYP, and mPW1PW91 levels using 6-31++G(d, p) basis set. Potential energy surface scans were performed with six possible structures ( I and Cl facing the o-, m-, and p-carbon atoms of toluene separately); the structures at the local minima of the surfaces were subjected to frequency calculation and the ones having no negative frequency were accepted as the real structure in the ground state. These structures were th

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Kaman, Singh, and Prasad Mahendra. "Solid state conductance in sucrose and its allied crystalline products." Journal of Indian Chemical Society Vol. 82, May 2005 (2005): 437–40. https://doi.org/10.5281/zenodo.5830102.

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Department of Physical Chemistry, Natiunal Sugar Institute. Kanpur-208 017. India <em>E-maiI</em> : drkamansingh@ yahoo.com <em>Manuscript received 12 October 2004, accepted 19 January 2005</em> The de electrical conductivity of AnalaR reagent sucrose (ARS), refined sugar (RS), beet sugar (BS) and plantation white sugar (PWS) across the temperature range of 305-350 K has been measured <em>in vacuo</em> employing an abonite conductivity cell of the configuration Cu/pellet/Cu. The aforesaid crystals have measurable electronic conductivities, with temperature dependence similar to that

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BUENDÍA MÉNDEZ, ALICIA. "Vivienda, función social y cesión de uso obligatoria a partir de la Sentencia del Tribunal Constitucional núm. 120/2024, de 8 de octubre." Revista Vasca de Administración Pública / Herri-Arduralaritzarako Euskal Aldizkaria, no. 131 (April 1, 2025): 103–39. https://doi.org/10.47623/ivap-rvap.131.2025.04.

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El presente trabajo tiene por objeto el análisis de la opinión mayoritaria y de los votos particulares vertidos por los Magistrados D. Ricardo Enríquez Sancho, D. Enrique Arnaldo Alcubilla, Dña. Concepción Espejel Jorquera y D. César Tolosa Tribiño en la Sentencia del Tribunal Constitucional núm. 120/2024, de 8 de octubre, y ello a partir de la configuración sustantiva del derecho constitucional al disfrute de una vivienda digna y adecuada. En este contexto, el examen se centra en la sistematización de los distintos mecanismos legislativos para la movilización del parque de vivienda vacía, con

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Vidadala, Ramasubbarao. "Study and optimization of Diels-Alder reaction of piperine in aqueous ionic solutions using Gn.HCl as a catalyst." Journal of Green Chemistry and Chemical Engineering 1, no. 1 (2021): 1–7. http://dx.doi.org/10.55124/jgce.v1i1.18.

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V. Rama Subbaraoa* aNatural Products Laboratory, Organic Chemistry Division-I, Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500007, India. Study and optimization of Diels-Alder reaction of piperine in aqueous ionic solutions using Gn.HCl as a catalyst. The semi-synthesis of these products using intermolecular [4+2] cycloaddition reaction has been described. Obtained products were characterized using IR, HNMR, CNMR and Mass Spectroscopy. Introduction An outsized number of phenomena concern to and are conducted in liquid phase involving ionic species (Mil

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Adachi, Yuki, C. S. Lim, and Nobuhito Maru. "On the vacuum structure of gauge-Higgs unification models." Progress of Theoretical and Experimental Physics, August 18, 2022. http://dx.doi.org/10.1093/ptep/ptac107.

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Abstract In this paper, we discuss the vacuum structure of the gauge-Higgs unification theory, which is one of the attractive candidates of physics beyond the standard model. This scenario has a remarkable feature, namely it has infinitely degenerate vacua due to the characteristic periodic potential of the Higgs filed, to be identified with the extra space component of the higher dimensional gauge field. We address a question, whether to form the superposition of such degenerate vacua, like the θ-vacuum in QCD, is necessary or not, in order to realize the true vacuum state of the theory. We d

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Gong, Jinn-Ouk, Maria Mylova, and Misao Sasaki. "New shape of parity-violating graviton non-Gaussianity." Journal of High Energy Physics 2023, no. 10 (2023). http://dx.doi.org/10.1007/jhep10(2023)140.

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Abstract We show that the general vacuum states that respect the de Sitter symmetry, known as the α-vacua, can introduce non-vanishing parity-violating tensor non-Gaussianities. This is due to the mixing by the Bogoliubov transformation of the positive and negative frequency modes of the Bunch-Davies vacuum. We calculate explicitly the bispectra of tensor perturbations and show that the amplitude can be exponentially enhanced for certain choices of the squeezing parameter α and the phase ϕ of the α-vacua. We find a new shape for the parity-violating tensor bispectrum which peaks in the flatten

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