Testing creation cold dark matter cosmology with the radiation temperature–redshift relation

Baranov, Iuri P. R.; Jesus, J. F.; Lima, J. A. S.

doi:10.1007/s10714-019-2516-3

Cited by 8 publications

(3 citation statements)

References 87 publications

(157 reference statements)

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“…Such predictions have been backed by numerous observations. For instance, the expected timedilation of remote events has been found in the light curves of supernovae Ia [5,6,7,8], a thermal radi- * yves-henri.sanejouand@univ-nantes.fr ation at a temperature of T 0 = 2.7 • K has been observed [9,10] and its redshift dependence has been confirmed [11,12,13].…”

Section: Introductionmentioning

confidence: 98%

A framework for the next generation of stationary cosmological models

Sanejouand

2020

Preprint

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According to a generic tired-light hypothesis found consistent with H(z) data, the density number of galaxies has been nearly constant over the last 10 Gyr at least, the density number of star-forming galaxies, as probed by sources of gamma-ray bursts, being constant as well, meaning that, as far as galaxies are concerned, the Universe has been stationary. On the other hand, an analysis of the luminosity distances of quasars and supernovae Ia shows that the Universe is far from being as transparent as assumed nowadays, the photon lifetime along the line-of-sight being one third of the Hubble time.

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Section: Introductionmentioning

confidence: 98%

A framework for the next generation of stationary cosmological models

Sanejouand

2020

Preprint

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“…A covariant formulation of the irreversible thermodynamics was developed in [73]. In fact, irreversible thermodynamics and thermodynamics of open systems is a widely studied field, since it is useful in various applications [74][75][76][77][78][79][80][81][82][83][84].…”

Section: Introductionmentioning

confidence: 99%

Gravitational induced particle production in scalar-tensor $f(R,T)$ gravity

Pinto,

Harko,

Lobo

2022

Preprint

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We explore the possibility of gravitationally generated particle production in the scalar-tensor representation of f (R, T ) gravity. Due to the explicit nonminimal curvature-matter coupling in the theory, the divergence of the matter energy-momentum tensor does not vanish. We explore the physical and cosmological implications of this property by using the formalism of irreversible thermodynamics of open systems in the presence of matter creation/annihilation. The particle creation rates, pressure, temperature evolution and the expression of the comoving entropy are obtained in a covariant formulation and discussed in detail. Applied together with the gravitational field equations, the thermodynamics of open systems lead to a generalization of the standard ΛCDM cosmological paradigm, in which the particle creation rates and pressures are effectively considered as components of the cosmological fluid energy-momentum tensor. We also consider specific models, and compare the scalar-tensor f (R, T ) cosmology with the ΛCDM scenario and the observational data for the Hubble function. The properties of the particle creation rates, of the creation pressures, and entropy generation through gravitational matter production are further investigated in both the low and high redshift limits.

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“…[14]. Various models of cosmological particle creation have also been used by many authors to model the late development of the universe [15,16,17]. The negative pressure arising in such cases can also produce a de Sitter space in the early universe if the rate of particle production in the early universe was high.…”

Section: Introductionmentioning

confidence: 99%

The nature of cosmological metric perturbations in presence of gravitational particle production

Bhattacharya¹,

Chatterjee²,

Hussain³

2020

Preprint

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The present paper addresses the issue of cosmological metric perturbations in models of cosmology accompanied by gravitational particle production. The general structure of such theories is constructed and then the paper focusses on metric perturbations of the de Sitter space in the early Universe full of radiation, such spaces can occur in presence of gravitational particle production. The main focus of the calculations is on scalar metric perturbations. The paper briefly opines on vector and tensor perturbations of the de Sitter space in question. The results show that the metric perturbations can have finite instability in the short scale and these instabilities may produce the inhomogeneities in the early radiation dominated universe. The instabilities are in general finite and do not tend to blow up to infinity. The tensor perturbations do not show any instability in the present model.

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Testing creation cold dark matter cosmology with the radiation temperature–redshift relation

Cited by 8 publications

References 87 publications

A framework for the next generation of stationary cosmological models

A framework for the next generation of stationary cosmological models

Gravitational induced particle production in scalar-tensor $f(R,T)$ gravity

The nature of cosmological metric perturbations in presence of gravitational particle production

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