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Non-Extensive Thermodynamics Effects in the Cosmology of f(T) Gravity
2021
Symmetry
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quantifies the non-extensive thermodynamics effects quantified by the parameter δ, which when is set equal to unity, one recovers the field equations of f(T) gravity. ...
Using f(T) gravitational theory, we construct modified cosmological models via the first law of thermodynamics by using the non-extensive thermodynamics framework, the effects of which are captured by ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/sym13010075
fatcat:oplzqhsql5clldqzphbzatmyvy
Cosmological reconstruction of f(T, 𝒯) gravity
2014
International Journal of Geometric Methods in Modern Physics (IJGMMP)
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Motivated by the newly proposal for gravity as the effect of the torsion scalar T and trace of the energy momentum tensor T,we investigate the cosmological reconstruction of different models of the Universe ...
Our aim here is to show that how this modified gravity model, f(T,T) is able to reproduce different epoches of the cosmological history. ...
Saridakis for useful comments and the anonymous reviewer for enlightening comments related to this work. ...
doi:10.1142/s0219887814500777
fatcat:4maaeno7rrfnlfr5w2kgypxhlu
f(Q, T) gravity
2019
European Physical Journal C: Particles and Fields
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We propose an extension of the symmetric teleparallel gravity, in which the gravitational action L is given by an arbitrary function f of the nonmetricity Q and of the trace of the matter energy-momentum ...
We consider several cosmological models by imposing some simple functional forms of the function f(Q,T), corresponding to additive expressions of f(Q,T) of the form f(Q,T)=α Q+β T, f(Q,T)=α Q^n+1+β T, ...
Data Availability Statement This manuscript has no associated data or the data will not be deposited [Authors' comment: There are no data for this study.] ...
doi:10.1140/epjc/s10052-019-7207-4
fatcat:3qtb5x53oba2llgaqv6x6dsqei
Growth factor inf(T,T)gravity
2016
Physical Review D
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2016 pre-print arXiv:1612.00974v1 fatcat:jze4b66yzrdpplq2m3nyii4ive
We investigate the growth factor for sub-horizon modes during late times in f(T,T) gravity, where T is the torsion scalar and T is the trace of the stress-energy tensor. ...
Furthermore, the role of the anisotropic term π^S is investigated. ...
The research work disclosed in this paper is partially funded by the ENDEAVOUR Scholarships Scheme. ...
doi:10.1103/physrevd.94.124004
fatcat:4dqpcxabifcanancx5lsmxcyq4
Constrainingf(T,T)gravity models using type Ia supernovae
2016
Physical Review D
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2016 pre-print arXiv:1603.09670v1 fatcat:6onsdid6u5blhjcjcympodt4gmOther Versions
We present an analysis of an f(T, T) extension of the Teleparallel Equivalent of General Relativity, where T denotes the torsion and T the trace of the energy-momentum tensor. ...
In particular, we construct two specific models that recover the usual continuity equation, namely, f(T, T)=T+g(T) and f(T, T)=T× g(T). ...
In fact, f (T ) gravity theories have been explored in a wide variety of aspects, namely alternative cosmological models [10] , observational constraints [11] , thermodynamics [12] , static solutions ...
doi:10.1103/physrevd.94.024034
fatcat:ypohoe2i2rgvrhdqpi2c5tsarm
Reconstruction, thermodynamics and stability of the ΛCDM model in $f(T,{ \mathcal T })$ gravity
2016
Classical and quantum gravity
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We reconstruct the ΛCDM model for f(T,T) Theory, where T is the torsion scalar and T the trace of the energy-momentum tensor. ...
We show that to maintain conservation of energy-momentum tensor should impose that F_g[y] must be linear on the trace T. This reconstruction decays in the f(T) Theory for F_g≡ Q, with Q a constant. ...
Ines G. Salako thanks IMSP for hospitality during the elaboration of this work. ...
doi:10.1088/0264-9381/33/12/125006
fatcat:asyb6xkr3zepvjgdumxy7pp4d4
Cosmological Issues in F(T) Gravity Theory
[article]
2015
arXiv
pre-print
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We explore various cosmological aspects of F(T) gravity including the evolution of the equation of state for the universe, finite-time future singularities, thermodynamics, and four-dimensional effective ...
We review recent developments on cosmology in extended teleparallel gravity, called "F(T) gravity" with T the torsion scalar in teleparallelism. ...
Furthermore, he is really grateful to all of the collaborators of our studies in terms of F (T ) gravity, especially, all the co-authors of the works in Refs. ...
arXiv:1504.04457v2
fatcat:7imvp4tmqjfdhk3vgze7c4335m
Energy-momentum squared symmetric Teleparallel gravity: f(Q,T_μνT^μν) gravity
[article]
2021
arXiv
pre-print
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In this work we propose the f(Q,T_μνT^μν) gravity as a further extension of the f(Q) and f(Q,T) gravity theories. ...
The action involves an arbitrary function of the non-metricity Q and T_μνT^μν in the gravity Lagrangian. ...
Acknowledgments The author acknowledges the Inter University Centre for Astronomy and Astrophysics (IUCAA), Pune, India for granting visiting associateship. ...
arXiv:2107.10240v1
fatcat:tam7swl5ond43ju3ife4rbudoe
Non-minimal geometry-matter couplings in Weyl-Cartan space-times: Myrzakulov f(R,T,Q,T) gravity
[article]
2021
arXiv
pre-print
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A thermodynamic interpretation of the nonconservation of the energy-momentum tensor is also developed in the framework of the thermodynamics of the irreversible processes in open systems. ...
We investigate the cosmological implications of the theory for two different choices of the gravitational action, corresponding to an additive and a multiplicative algebraic structure of the function f ...
The action of the theory is given by S = [f (R, T ) + L m ] √ −gd 4 x. The astrophysical and cosmological applications of f (R, T ) theory were studied extensively in . ...
arXiv:2110.00358v1
fatcat:fxvs7cg4ibbtbjtjhc5sz5l56i
Friedmann cosmology with particle creation in modified f(R,T) gravity
[article]
2014
arXiv
pre-print
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The theoretical and observational consequences of thermodynamics of open systems, which allow particle creation are investigated in modified f(R,T) (R is the Ricci scalar and T is the trace of energy-momentum ...
A simplest particular model f(R,T)=R+2f(T) and "gamma-law" equation of state p=(γ-1)ρ are assumed to explore the role of particle creation in the early and late time evolution of the universe. ...
Sharif and Zubair 63 have discussed a non-equilibrium thermodynamics in f (R, T ) gravity by taking two forms of the energy-momentum tensor of dark components which endorses second law of thermodynamics ...
arXiv:1408.0633v2
fatcat:5jqtvy2esbfs3im4vj2ccs4d3u
Energy conditions in f(Q,T) gravity
2020
Physica Scripta
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2020 pre-print arXiv:2010.00281v1 fatcat:xn6nqma3onfz3lrm3qbmfjkp7e
The recently proposed f(Q, T) gravity (Xu et al. Eur. Phys. J. C 79 (2019) 708) is an extension of the symmetric teleparallel gravity. ...
In this paper, we examined the essence of some well prompted forms of f(Q,T) gravity models i.e. f(Q,T)= mQ+bT and f(Q,T)= m Q^n+1+b T where m, b, and n are model parameters. ...
The coupling between Q and T results in the non-conservation of the energy-momentum tensor, which entails some significant thermodynamic change of the Universe as in f (R, T) gravity [6] . ...
doi:10.1088/1402-4896/abaddc
fatcat:vilpgnilm5bsdabpcul6g4ni7e
Bulk viscosity in F(T, TG) gravity
2017
Canadian journal of physics (Print)
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Concluding Remarks In cosmology, viscous fluid models have extensively been considered to explore expanding nature of the universe. ...
Many dark energy models have been discussed in F (G) gravity as well [17, 18] . In this paper, we evaluate the EoS parameter by introducing bulk viscosity in the background of F (T, T G ) gravity. ...
doi:10.1139/cjp-2016-0785
fatcat:h7ag2ivynnfk5lk3d2kjrqnctu
Further matters in space-time geometry:f(R,T,RμνTμν)gravity
2013
Physical Review D
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We consider a gravitational model in which matter is non-minimally coupled to geometry, with the effective Lagrangian of the gravitational field being given by an arbitrary function of the Ricci scalar ...
The cosmological implications of the model are investigated for both the conservative and non-conservative cases, and several classes of analytical solutions are obtained. ...
The astrophysical and cosmological implications of the f (R, T ) gravity theory have been extensively investigated recently [32] . ...
doi:10.1103/physrevd.88.044023
fatcat:6jlmaljyfjbklesay5lwxhofsu
Holographic polytropic f(T)-gravity models
[article]
2015
arXiv
pre-print
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The present paper reports a study on the cosmological consequences arising from reconstructing f(T) gravity through new holographic-polytropic dark energy. ...
We obtain the deceleration parameter, effective equation of state as well as torsion equation of state parameters from total density and pressure in both cases. ...
However, the maximum entropy in a box possessing volume L 3 (growing with the area of the box) behaves non-extensively in the framework of BH thermodynamics so called Bekenstein entropy bound. ...
arXiv:1510.01611v1
fatcat:plerwrmqinbbfcwnxn25klvvii
Violation of the First Law of Thermodynamics inf(R,T) Gravity
2012
Chinese Physics Letters
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2012 pre-print arXiv:1209.2916v1 fatcat:reziq23d35dhxacwb3dtbvbufyOther Versions
We have proved, in general, that the first law of black bole thermodynamics is violated for f(R,T) gravity. ...
But there might exist some special cases in which the first law for f(R,T) gravity is recovered. ...
This model is an extension of a former model f (R). In this extension, there is a non-minimally coupling between the Ricci scalar R and the trace of the energy-momentum tensor. ...
doi:10.1088/0256-307x/29/10/109801
fatcat:nf6wekdffragbh7mmm3ec3eqve
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