Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Tuan, Q.; Kao, W. F.

doi:10.1140/epjc/s10052-018-6008-5

Cited by 14 publications

(24 citation statements)

References 103 publications

(212 reference statements)

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“…On the other hand, Eq. (4.6) admits at least one positive root if a 1 a 6 < 0 [47][48][49][50][51][52]. Therefore the corresponding anisotropic solution is unstable if a 1 a 6 < 0.…”

Section: Inflationary Phasementioning

confidence: 99%

“…In particular, we would like to obtain a new set of power-law analytic solutions with the form [43,44,[47][48][49][50][51][52]:…”

Section: Anisotropic Power-law Solutionsmentioning

confidence: 99%

“…In order to understand the stability of the set of power-law solutions, we will consider the power-law perturbation of the field equations with δα = A α t m , δσ = A σ t m , and δφ = A φ t m [47][48][49][50][51][52]. Perturbing Eqs.…”

Section: Inflationary Phasementioning

confidence: 99%

“…In particular, the anisotropy will survive the inflation if I is chosen to be a canonical function of a scalar field as shown in the KSW model [43,44,[49][50][51][52]. On the other hand, if I is chosen as a function of the kinetic term of the scalar field, the anisotropy is unstable during the inflationary phase.…”

Section: Inflationary Phasementioning

confidence: 99%

“…More interestingly, non-canonical extensions of the KSW model, in which a scalar field takes non-canonical form such as Dirac-Born-Infeld (DBI), supersymmetric Dirac-BornInfeld (SDBI), and covariant Galileon forms, have also been shown to admit stable and attractive Bianchi type I inflationary solutions [49][50][51][52]. This indicates that the cosmic no-hair conjecture does not hold for the extended KSW models due to the presence of the coupling term f 2 (φ)F μν F μν .…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic power-law inflation for a conformal-violating Maxwell model

Tuan

Kao

2018

Eur. Phys. J. C

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A set of power-law solutions of a conformalviolating Maxwell model with a non-standard scalar-vector coupling will be shown in this paper. In particular, we are interested in a coupling term of the form X 2n F μν F μν with X denoting the kinetic term of the scalar field. Stability analysis indicates that the new set of anisotropic power-law solutions is unstable during the inflationary phase. The result is consistent with the cosmic no-hair conjecture. We show, however, that a set of stable slowly expanding solutions does exist for a small range of parameters λ and n. Hence a small anisotropy can survive during the slowly expanding phase.

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“…On the other hand, Eq. (4.6) admits at least one positive root if a 1 a 6 < 0 [47][48][49][50][51][52]. Therefore the corresponding anisotropic solution is unstable if a 1 a 6 < 0.…”

Section: Inflationary Phasementioning

confidence: 99%

“…In particular, we would like to obtain a new set of power-law analytic solutions with the form [43,44,[47][48][49][50][51][52]:…”

Section: Anisotropic Power-law Solutionsmentioning

confidence: 99%

Section: Inflationary Phasementioning

confidence: 99%

Section: Inflationary Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic power-law inflation for a conformal-violating Maxwell model

Tuan

Kao

2018

Eur. Phys. J. C

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Gravitational phase transition mediated by thermalon in Einstein-Gauss-Bonnet-Maxwell-Kalb-Ramond gravity

Samart

Channuie

2020

J. High Energ. Phys.

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In this work, we study the possible existence of gravitational phase transition from AdS to dS asymptotic geometries in Einstein-Gauss-Bonnet gravity by adding the Maxwell one-form field (A µ) and the Kalb-Ramond two-form field (B µν) as impurity substitutions. The phase transitions proceed via the bubble nucleation of spherical thin-shells described by different branches of the solutions which host a dS black hole in the interior and asymptotic thermal AdS state in the exterior. We analyze the phase diagrams of the free energy and temperature to demonstrate the existence of the phase transitions in the grand canonical ensemble (fixed electrical potential). The phase transitions of having the one-form and two-form charges are possible in which the critical temperature is lower than that of the neutral case. Comparing results with existing literature, more importantly, our analyses show that the critical temperature and the Gauss-Bonnet coupling λ of the phase transitions get decreased by adding more types of the charges.

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Compact stars admitting Finch-Skea symmetry in the presence of various matter fields*

Sokoliuk¹,

Baransky²,

Sahoo³

2023

Chinese Phys. C

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In the present article authors investigate the anisotropic stellar solutions admitting Finch-Skea symmetry (viable and non-singular metric potentials) in the presence of some exotic matter fields, such as: Bose-Einstein Condensate (BEC) dark matter, Kalb-Ramond fully anisotropic rank-2 tensor field from the low-energy string theory effective action, gauge field imposing $U(1)$ symmetry. Interior spacetime is matched with both Schwarzchild and Reissner-N"ordstrom vacuum spacetimes for BEC, KB and gauge fields respectively. Further, we have studied energy conditions, Equation of State (EoS), radial derivatives of energy density and anisotropic pressures, Tolman-Oppenheimer-Volkoff equilibrium condition, relativistic adiabatic index, sound speed and surface redshift. Most of the aforementioned conditions were satisfied and therefore solutions derived in the current study lie in the physically acceptable regime.

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Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Cited by 14 publications

References 103 publications

Anisotropic power-law inflation for a conformal-violating Maxwell model

Anisotropic power-law inflation for a conformal-violating Maxwell model

Gravitational phase transition mediated by thermalon in Einstein-Gauss-Bonnet-Maxwell-Kalb-Ramond gravity

Compact stars admitting Finch-Skea symmetry in the presence of various matter fields*

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