de Sitter thermodynamics and the braneworld

Calcagni, Gianluca

doi:10.1088/1126-6708/2005/09/060

Cited by 54 publications

(34 citation statements)

References 78 publications

(55 reference statements)

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“…Further studies on the connection between gravity and thermodynamics has been investigated in various gravity theories [2,3,4,5,6,7,8,9,10]. In the cosmological context, attempts to disclose the connection between Einstein gravity and thermodynamics were carried out in [11,12,13,14,15,16,17,18,19,20,21,22]. It was shown that the differential form of the Friedmann equation in the FRW universe can be written in the form of the first law of thermodynamics on the apparent horizon.…”

Section: Introductionmentioning

confidence: 99%

Generalized Second Law of Thermodynamics in Warped DGP Braneworld

Sheykhi

Wang

2010

Mod. Phys. Lett. A

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We investigate the validity of the generalized second law of thermodynamics on the (n − 1)-dimensional brane embedded in the (n + 1)-dimensional bulk. We examine the evolution of the apparent horizon entropy extracted through relation between gravitational equation and the first law of thermodynamics together with the matter field entropy inside the apparent horizon. We find that the apparent horizon entropy extracted through connection between gravity and the first law of thermodynamics satisfies the generalized second law of thermodynamics. This result holds regardless of whether there is the intrinsic curvature term on the brane or a cosmological constant in the bulk. The observed satisfaction of the generalized second law provides further support on the thermodynamical interpretation of gravity based on the profound connection between gravity and thermodynamics.

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Section: Introductionmentioning

confidence: 99%

Generalized Second Law of Thermodynamics in Warped DGP Braneworld

Sheykhi

Wang

2010

Mod. Phys. Lett. A

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“…The probability of the creation of a closed universe from nothing was computed in Ref. [46], and can be written as…”

Section: Constant Potentialmentioning

confidence: 99%

TACHYONIC UNIVERSES IN PATCH COSMOLOGIES WITH Ω > 1

et al. 2009

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“…Then, the Einstein field equations were obtained from the relation of entropy and horizon area together with the Clausius relation dQ = T dS where Q, S and T are the heat, the entropy and the temperature, respectively. In this regard, where the connection between gravity and thermodynamics holds, the Friedmann equations are obtained by applying the first law of thermodynamics to the apparent horizon of the FLRW universe [65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82]. The second law of thermodynamics and its generalized version is also studied in different modified gravity models such as .…”

Section: Introductionmentioning

confidence: 99%

Emergent cosmos in Einstein–Cartan theory

et al. 2018

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Based on Padmanabhan's proposal, the accelerated expansion of the universe can be driven by the difference between the surface and bulk degrees of freedom in a region of space, described by the relation dV /dt = N sur − N bulk where N sur and N bulk = −N em + N de are the degrees of freedom assigned to the surface area and the matter-energy content inside the bulk such that the indices "em" and "de" represent energy-momentum and dark energy, respectively. In the present work, the dynamical effect of the Weyssenhoff perfect fluid with intrinsic spin and its corresponding spin degrees of freedom in the framework of Einstein-Cartan (EC) theory are investigated. Based on the modification of Friedmann equations due to the spin-spin interactions, a correction term for Padmanabhan's original relation dV /dt = N sur +N em −N de including the number of degrees of freedom related with these spin interactions is obtained through the modification in N bulk term as N bulk = −N em + N spin + N de leading to dV /dt = N sur + N em − N spin − N de in which N spin is the corresponding degrees of freedom related with the intrinsic spin of the matter content of the universe. Moreover, the validity of the unified first law and the generalized second law of thermodynamics for the Einstein-Cartan cosmos are investigated. Finally, by considering the covariant entropy conjecture and the bound resulting from the emergent scenario, a total entropy bound is obtained. Using this bound, it is shown that the for the universe as an expanding thermodynamical system, the total effective Komar energy never exceeds the square of the expansion rate with a factor of 3 4π .

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de Sitter thermodynamics and the braneworld

Cited by 54 publications

References 78 publications

Generalized Second Law of Thermodynamics in Warped DGP Braneworld

Generalized Second Law of Thermodynamics in Warped DGP Braneworld

TACHYONIC UNIVERSES IN PATCH COSMOLOGIES WITH Ω > 1

Emergent cosmos in Einstein–Cartan theory

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