Nonsingular Universes in Gauss–bonnet Gravity’s Rainbow

Hendi, S. H.; Momennia, Mehrab; Panah, B. Eslam; Faizal, Mir

doi:10.3847/0004-637x/827/2/153

Cited by 86 publications

(48 citation statements)

References 66 publications

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“…Our work actually offers a concise way to the fully stable nonsingular cosmologies. See also [40][41][42][43][44][45][46][47][48] for other interesting studies.…”

Section: Jhep09(2017)027 4 Discussionmentioning

confidence: 99%

A covariant Lagrangian for stable nonsingular bounce

Cai

Piao

2017

J. High Energ. Phys.

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Abstract:The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable nonsingular bounce, which has the quadratic order of the second order derivative of the field φ but the background set only by P (φ, X). With it, we explicitly construct a fully stable nonsingular bounce model for the ekpyrotic scenario.

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“…Our work actually offers a concise way to the fully stable nonsingular cosmologies. See also [40][41][42][43][44][45][46][47][48] for other interesting studies.…”

Section: Jhep09(2017)027 4 Discussionmentioning

confidence: 99%

A covariant Lagrangian for stable nonsingular bounce

Cai

Piao

2017

J. High Energ. Phys.

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“…In gravity's rainbow framework, the Hawking, Unruh, free-fall and fiducial temperatures of the black hole have also been investigated [36,37]. In addition, remnants of black objects [38], asymptotic flatness [39], nonsingular universes in Einstein and Gauss-Bonnet gravities [40,41] have been studied in the gravity's rainbow background. The zero point energy in a spherically symmetric background combining the high energy distortion of gravity's rainbow with the modification induced by a f (R) theory has been interpreted in Ref.…”

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confidence: 99%

Cosmic string in gravity’s rainbow

Momeni

Upadhyay

Myrzakulov

et al. 2017

Astrophys Space Sci

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In this paper, we study the various cylindrical solutions (cosmic strings) in gravity's rainbow scenario. In particular, we calculate the gravitational field equations corresponding to energy-dependent background. Further, we discuss the possible Kasner, quasi-Kasner and non-Kasner exact solutions of the field equations. In this framework, we find that quasiKasner solutions can not be realized in gravity's rainbow. Assuming only time-dependent metric functions, we also analyse the time-dependent vacuum cosmic strings in gravity's rainbow, which are completely different than the other GR solutions. I. OVERVIEW AND MOTIVATIONA strong notion of an observer independent minimum length scale has been found in all theories of quantum gravity, for instance, in string theory [1], noncommutative geometry [2], loop quantum gravity [3,4] and Lorentzian dynamical triangulations [5][6][7][8]. Here we point out that the nascent GW astronomy [9] could help in discriminating among general relativity or alternative theories [10]. There is no harm to assume this minimum measurable length scale as the Planck scale. The mathematical ground of general theory of relativity is based on a smooth manifold which breaks down when energies of probe reaches the order of Planck energy [11,12].Keeping this point in mind, one may expect a radically new picture of spacetime, which includes departure from the standard relativistic dispersion relation. A departure from the standard dispersion relation indicates that the system incorporates a breaking of Lorentz invariance. * Electronic address:

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“…Regarding the used method of this paper, it is interesting to extend obtained results to an energy dependent space-time and discuss the role of gravity's rainbow [92][93][94][95]. We leave this issue for future work.…”

Section: Resultsmentioning

confidence: 98%

Phase Transition of Black Holes in Brans–Dicke Born–Infeld Gravity through Geometrical Thermodynamics

Hendi

Talezadeh

Armanfard

2017

Advances in High Energy Physics

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The publication of this article was funded by SCOAP 3 .Using the geometrical thermodynamic approach, we study phase transition of Brans-Dicke Born-Infeld black holes. We apply introduced methods and describe their shortcomings. We also use the recently proposed new method and compare its results with those of canonical ensemble. By considering the new method, we find that its Ricci scalar diverges in the places of phase transition and bound points. We also show that the bound point can be distinguished from the phase transition points through the sign of thermodynamical Ricci scalar around its divergencies.

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Nonsingular Universes in Gauss–bonnet Gravity’s Rainbow

Cited by 86 publications

References 66 publications

A covariant Lagrangian for stable nonsingular bounce

A covariant Lagrangian for stable nonsingular bounce

Cosmic string in gravity’s rainbow

Phase Transition of Black Holes in Brans–Dicke Born–Infeld Gravity through Geometrical Thermodynamics

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