Primordial gravitational waves in horizon cosmology and constraints on entropic parameters

Odintsov, Sergei D.; D’Onofrio, Simone; Paul, Tanmoy

doi:10.1103/physrevd.110.043539

Phys. Rev. D

2024

DOI: 10.1103/physrevd.110.043539

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Primordial gravitational waves in horizon cosmology and constraints on entropic parameters

Sergei D. Odintsov,

Simone D’Onofrio,

Tanmoy Paul

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2024

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Cited by 2 publications

References 58 publications

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Exact Model of Gravitational Waves and Pure Radiation

Osetrin,

Epp,

Filippov

2024

Symmetry

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An exact non-perturbative model of a gravitational wave with pure radiation is constructed. It is shown that the presence of dust matter in this model contradicts Einstein’s field equations. The exact solution to Einstein’s equations for gravitational wave and pure radiation is obtained. The trajectories of propagation and the characteristics of radiation are found. For the considered exact model of a gravitational wave, a retarded time equation for radiation is obtained. The obtained results are used to construct an exact model of gravitational wave and pure radiation for the Bianchi type IV universe.

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Exact Model of Gravitational Waves and Pure Radiation

Osetrin,

Epp,

Filippov

2024

Symmetry

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Different Aspects of Entropic Cosmology

Nojiri,

Odintsov,

Paul

2024

Universe

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We provide a short review of the recent developments in entropic cosmology based on two thermodynamic laws of the apparent horizon, namely the first and the second laws of thermodynamics. The first law essentially provides the change in entropy of the apparent horizon during the cosmic evolution of the universe; in particular, it is expressed by TdS=−d(ρV)+WdV (where W is the work density and other quantities have their usual meanings). In this way, the first law actually links various theories of gravity with the entropy of the apparent horizon. This leads to a natural question—“What is the form of the horizon entropy corresponding to a general modified theory of gravity?”. The second law of horizon thermodynamics states that the change in total entropy (the sum of horizon entropy + matter fields’ entropy) with respect to cosmic time must be positive, where the matter fields behave like an open system characterised by a non-zero chemical potential. The second law of horizon thermodynamics importantly provides model-independent constraints on entropic parameters. Finally, we discuss the standpoint of entropic cosmology on inflation (or bounce), reheating and primordial gravitational waves from the perspective of a generalised entropy function.

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Primordial gravitational waves in horizon cosmology and constraints on entropic parameters

Cited by 2 publications

References 58 publications

Exact Model of Gravitational Waves and Pure Radiation

Exact Model of Gravitational Waves and Pure Radiation

Different Aspects of Entropic Cosmology

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