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Gravitational Entropy and Inflation [PDF]

Entropy, 2013
The main topic of this paper is a description of the generation of entropy at the end of the inflationary era. As a generalization of the present standard model of the Universe dominated by pressureless dust and a Lorentz invariant vacuum energy (LIVE ...
Øystein Elgarøy, Øyvind Grøn
doaj   +9 more sources

On the Thermodynamic Origin of Gravitational Force by Applying Spacetime Entanglement Entropy and the Unruh Effect

Entropy, 2019
We consider the thermodynamic origin of the gravitational force of matter by applying the spacetime entanglement entropy and the Unruh effect originating from vacuum quantum fluctuations.
Shujuan Liu, Hongwei Xiong
doaj   +4 more sources

Volume-Law Entropy as a Mesoscopic Anomaly [PDF]

Entropy
Area-law entropy appears in local quantum ground states, low-temperature Gibbs states, and gravitational physics, whereas classical thermodynamics is formulated with volume-extensive entropy.
Lamine Bougueroua
doaj   +2 more sources

Barrow entropy and stochastic gravitational wave background generated from cosmological QCD phase transition

Physics Letters B, 2023
In this work we investigate the stochastic gravitational wave background generated during the first-order cosmological QCD phase transition of the early universe in the framework of the Barrow entropy.
Qi-Min Feng, Zhong-Wen Feng, Xia Zhou, Qing-Quan Jiang   +3 more
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Entropy and Gravity [PDF]

Entropy, 2012
The effect of gravity upon changes of the entropy of a gravity-dominated system is discussed. In a universe dominated by vacuum energy, gravity is repulsive, and there is accelerated expansion.
Øyvind Grøn
doaj   +3 more sources

Information Storage in a Black Hole’s Gravitational Field [PDF]

Entropy
The key to resolving the black hole information loss paradox lies in clarifying the origin of black hole entropy and the mechanism by which black holes store information.
Dongshan He, Jinfang Li, Qian Qiu
doaj   +2 more sources

Theory of Gravity Dependent on Entropy

Reports in Advances of Physical Sciences, 2023
Gravitational redshift decreases the resolution of measurements, causing entropy by increasing the possible microstates of position and momentum for objects within a gravitational field.
Christopher N. Watson
doaj   +1 more source

On the entropy variation in the scenario of entropic gravity

Physics Letters B, 2018
In the scenario of entropic gravity, entropy varies as a function of the location of the matter, while the tendency to increase entropy appears as gravity.
Yong Xiao, Shi-Yang Bai
doaj   +1 more source

Island in the presence of higher derivative terms

Journal of High Energy Physics, 2021
Using extended island formula we compute entanglement entropy of Hawking radiation for black hole solutions of certain gravitational models containing higher derivative terms.
Mohsen Alishahiha, Amin Faraji Astaneh, Ali Naseh   +2 more
doaj   +1 more source

Solutions to the Cosmic Initial Entropy Problem without Equilibrium Initial Conditions

Entropy, 2017
The entropy of the observable universe is increasing. Thus, at earlier times the entropy was lower. However, the cosmic microwave background radiation reveals an apparently high entropy universe close to thermal and chemical equilibrium.
Vihan M. Patel, Charles H. Lineweaver
doaj   +1 more source