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We present hydrodynamic equations with relativistic pressure and velocity in the presence of weak gravity, in a cosmological context. Previously we consistently derived special relativistic hydrodynamic equations with weak gravity in…

广义相对论与量子宇宙学 · 物理学 2018-11-14 Hyerim Noh , Jai-chan Hwang , Chan-Gyung Park

In this paper, we examine the validity of the generalized second law of thermodynamics (GSLT) of the universe bounded by the event horizon in brane-world gravity. Here we consider homogeneous and isotropic model of the universe filled with…

广义相对论与量子宇宙学 · 物理学 2011-02-09 Nairwita Mazumder , Subenoy Chakraborty

A generalization of entropy to near-equilibrium phenomena is provided by the notion of a hydrodynamic entropy current. Recent advances in holography have lead to the formulation of fluid-gravity duality, a remarkable connection between the…

高能物理 - 理论 · 物理学 2011-03-29 Ivan Booth , Michal P. Heller , Michal Spalinski

We consider a spatially flat Friedmann-Lemaitre-Robertson-Walker space time and investigate the second law and the generalized second law of thermodynamics for apparent horizon in generalized modified Gauss Bonnet theory of gravity (whose…

广义相对论与量子宇宙学 · 物理学 2011-01-17 H. Mohseni Sadjadi

We study 3-dimensional gravity on a spacetime bounded by a generic 2-dimensional causal surface. We review the solution phase space specified by 4 generic functions over the causal boundary, construct the symplectic form over the solution…

高能物理 - 理论 · 物理学 2023-07-26 H. Adami , A. Parvizi , M. M. Sheikh-Jabbari , V. Taghiloo , H. Yavartanoo

Motivated by recent results on non-vanishing spatial curvature \cite{curve} we employ the holographic model of dark energy to investigate the validity of first and second laws of thermodynamics in non-flat (closed) universe enclosed by…

广义相对论与量子宇宙学 · 物理学 2009-11-11 M. R. Setare , S. Shafei

In this paper we use the effective blackfold description of branes to extend the study of the thermal BIon, a D-brane and parallel anti-D-brane connected by a wormhole with F-string charge in hot flat space, by introducing a radial boost…

高能物理 - 理论 · 物理学 2017-12-06 Gianluca Grignani , Troels Harmark , Callum Kift , Andrea Marini , Marta Orselli

We investigate the validity of the generalized second law of thermodynamics, applying Barrow entropy for the horizon entropy. The former arises from the fact that the black-hole surface may be deformed due to quantum-gravitational effects,…

广义相对论与量子宇宙学 · 物理学 2021-09-16 Emmanuel N. Saridakis , Spyros Basilakos

The fluid/gravity correspondence establishes how gravitational dynamics, as dictated by Einstein's field equations, are related to the fluid dynamics, governed by the relativistic Navier-Stokes equations. In this work the correspondence is…

高能物理 - 理论 · 物理学 2021-11-09 A. J. Ferreira-Martins , R. da Rocha

In Newtonian physics, the excitation spectrum of a fluid is the same in all reference frames, up to a trivial shift. In special relativity, this is no longer the case. Relativity of simultaneity causes different inertial observers to…

广义相对论与量子宇宙学 · 物理学 2026-01-07 Lorenzo Gavassino

Black hole thermodynamics in Lorentz-violating gravity is subtle because different excitations propagate at different speeds and hence identify different causal horizons. We revisit Einstein--AEther gravity using the covariant phase space…

广义相对论与量子宇宙学 · 物理学 2026-04-01 Walter Arata , Stefano Liberati , Giulio Neri

It is possible to provide a physical interpretation for the field equations of gravity based on a thermodynamical perspective. The virtual degrees of freedom associated with the horizons perceived by the local Rindler observers, play a…

广义相对论与量子宇宙学 · 物理学 2010-05-12 T. Padmanabhan

The present work deals with a detailed study of universal thermodynamics in different modified gravity theories. The validity of the generalized second law of thermodynamics (GSLT) and thermodynamical equilibrium (TE) of the Universe…

广义相对论与量子宇宙学 · 物理学 2016-11-02 Saugata Mitra , Subhajit Saha , Subenoy Chakraborty

Using the generalized procedure proposed by \emph{Wu et al}\cite{wu} recently, we construct the first law of thermodynamics on apparent horizon in a general braneworld model with curvature correction terms on the brane and in the bulk,…

广义相对论与量子宇宙学 · 物理学 2010-01-07 Tao Zhu , Ji-Rong Ren , Shu-Fan Mo

We investigate the first law of thermodynamics and entropy associated to the apparent horizon of (non-flat) FLRW space-time in different theories of modified gravity and in the presence of a perfect fluid of matter. We pose our attention on…

广义相对论与量子宇宙学 · 物理学 2023-11-21 Lorenzo Sebastiani

Several general arguments indicate that the event horizon behaves as a stretched membrane. We propose using this relation to understand gravity and dynamics of black objects in higher dimensions. We provide evidence that (i) the…

高能物理 - 理论 · 物理学 2008-11-26 Vitor Cardoso , Oscar J. C. Dias , Leonardo Gualtieri

The long-wavelength effective field theory of world-volume fluctuations of black D3-branes is shown to be a hydrodynamical system to leading order in a gradient expansion. We study the system on a fiducial `cutoff' surface: the fluctuating…

高能物理 - 理论 · 物理学 2022-03-07 Roberto Emparan , Veronika E Hubeny , Mukund Rangamani

The relativistic continuity equations for the extensive thermodynamic quantities are derived based on the divergence theorem in Minkowski space outlined by St\"uckelberg. This covariant approach leads to a relativistic formulation of the…

统计力学 · 物理学 2022-10-11 Sylvain D. Brechet , Marin C. A. Girard

We study the generalized second law (GSL) of thermodynamics in $f(T)$ cosmology. We consider the universe as a closed bounded system filled with $n$ component fluids in the thermal equilibrium with the cosmological boundary. We use two…

综合物理 · 物理学 2013-02-25 Kazuharu Bamba , Mubasher Jamil , D. Momeni , Ratbay Myrzakulov

In this paper, we investigate the thermodynamic aspects of quadratic gravity in a $D$-dimensional Friedmann-Lemaitre-Robertson-Walker (FLRW) universe. First, we derive the field equations and the effective energy-momentum tensor for…

广义相对论与量子宇宙学 · 物理学 2025-07-17 Navid Safarzadeh Ilkhchi , Amin Rezaei Akbarieh , Yaghoub Heydarzade