The Solution of the Cosmological Constant Problem: The Cosmological Constant Exponential Decrease in the Super-Early Universe

Babourova, O. V.; Frolov, B. N.

doi:10.3390/universe6120230

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…One can check numerically that it is positive and decreases towards 0 very rapidly. Such an asymptotically vanishing effective cosmological constant scenario was previously discussed in [24][25][26][27][28][29]. Next we show that although the universe is late time de Sitter (dS)-like, it is anti-de Sitter (AdS)-like in the very early universe.…”

Section: Dark Energy From a Running Barrow Entropy Indexsupporting

confidence: 64%

Sign Switching Dark Energy from a Running Barrow Entropy

Di Gennaro,

Ong

2022

Preprint

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Section: Dark Energy From a Running Barrow Entropy Indexsupporting

confidence: 64%

Sign Switching Dark Energy from a Running Barrow Entropy

Di Gennaro,

Ong

2022

Preprint

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“…The cosmological constant problem [55] has yet to be solved, despite much research in the area. One possibility is a dynamic cosmological parameter [56] which can fit the observations [57] or fit the observations even better than the standard ΛCDM model [58]. For t → 0 , the deceleration parameter q tends to be constant.…”

Section: Discussionmentioning

confidence: 99%

Anisotropic Cosmological Model in a Modified Theory of Gravitation

Tiwari¹,

Беешам

Mishra

et al. 2021

Universe

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Current observations indicate that, on a large enough scale, the universe is homogeneous and isotropic. However, this does not preclude the possibility of some anisotropy having occurred during the early stages of the evolution of the universe, which could then have been damped out later. This idea has aroused interest in the Bianchi models, which are homogeneous but anisotropic. Secondly, there is much interest in modified gravity these days due to the problems that the usual ΛCDM model faces in general relativity. Hence, in this paper, a study was conducted on the Bianchi type-I cosmological model in f(R,T)-modified gravity. Following some ideas from cosmography, a specific form of the deceleration parameter was assumed, leading to a model that exhibited a transition from early deceleration to late-time acceleration. The derived model approached isotropy at late times. The physical properties of the model were discussed, and expressions for the various parameters of the model were derived. It is also possible to make progress towards solving the cosmological constant problem, since in this model in f(R,T) gravity, a variable cosmological-type parameter arose, which was large early on but decreased to a constant value in later times.

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“…This problem has still not been solved, despite much research in the area. One possibility is a dynamic cosmological parameter [12] which can either fit the observations [13], or fit them even better than the standard ΛCDM model [14].…”

Section: Introductionmentioning

confidence: 99%

FLRW Cosmological Models with Dynamic Cosmological Term in Modified Gravity

Tiwari¹,

Беешам

Shukla³

2021

Universe

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Although the standard lambda cold dark matter cosmological model is quite successful in describing the universe, there are still several issues that are still not resolved. Some of these are the cosmological constant problem, certain anomalies in the cosmic microwave background radiation and whether general relativity is valid on large scales. Therefore, it is interesting to examine modified theories in an attempt to solve these problems, and to examine the entire range of possibilities that are allowed. In this work, we examine one of these modified theories, viz., f(R,T) gravity. We study the homogeneous and isotropic models in this theory, which have some pleasing features, such as no initial singularity, a dynamic cosmological term, and a transition from early deceleration to late-time acceleration as intimated by observations. The physical parameters of the model, as well as the energy conditions, are discussed and a viable cosmological model can be constructed.

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The Solution of the Cosmological Constant Problem: The Cosmological Constant Exponential Decrease in the Super-Early Universe

Cited by 8 publications

References 31 publications

Sign Switching Dark Energy from a Running Barrow Entropy

Sign Switching Dark Energy from a Running Barrow Entropy

Anisotropic Cosmological Model in a Modified Theory of Gravitation

FLRW Cosmological Models with Dynamic Cosmological Term in Modified Gravity

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