New models and Big Bang Nucleosynthesis constraints in $f(Q)$ gravity

Anagnostopoulos, Fotios K.; Gakis, Viktor; Saridakis, Emmanuel N.; Basilakos, Spyros

doi:10.48550/arxiv.2205.11445

Cited by 9 publications

(14 citation statements)

References 55 publications

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“…Now, we assume that the various particles (neutrinos, electrons, photons) temperatures are the same, and low enough in order to use the Boltzmann distribution instead of the Fermi-Dirac one, and we neglect the electron mass compared to the electron and neutrino energies. The final expression for the conversion rate is [84][85][86][87]…”

Section: Big Bang Nucleosynthesis Constraintsmentioning

confidence: 99%

“…The freeze-out temperature T f , in which the decoupling takes place, corresponds to H(T f ) = λ tot (T f ) c q T 5 f , with c q ≡ 4A 4! 9.8×10 −10 GeV −4 [84][85][86][87]. Now if we use (18) and H(T f ) = λ tot (T f ) c q T 5 f , we acquire…”

Section: Big Bang Nucleosynthesis Constraintsmentioning

confidence: 99%

“…Specifically, the amount of modification needed in order to fulfill the late-time cosmological requirements must not at the same time spoil the successes of early-time cosmology, and among them the BBN phase. Hence, whatever are the advantages of a specific modified theory of gravity, if it cannot satisfy the BBN constraints it must be excluded [84][85][86][87].…”

Section: Introductionmentioning

confidence: 99%

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Big Bang Nucleosynthesis constraints on $f(T,T_G)$ gravity

Asimakis,

Saridakis,

Basilakos

et al. 2022

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We confront f (T, TG) gravity, with Big Bang Nucleosynthesis (BBN) requirements. The former is obtained using both the torsion scalar, as well as the teleparallel equivalent of the Gauss-Bonnet term, in the Lagrangian, resulting to modified Friedmann equations in which the extra torsional terms constitute an effective dark energy sector. We calculate the deviations of the freeze-out temperature T f , caused by the extra torsion terms in comparison to ΛCDM paradigm. Then we impose five specific f (T, TG) models and we extract the constraints on the model parameters in order for the ratio |∆T f /T f | to satisfy the observational BBN bound. As we find, in most of the models the involved parameters are bounded in a narrow window around their General Relativity values as expected, as in the power-law model where the exponent n needs to be n 0.5. Nevertheless the logarithmic model can easily satisfy the BBN constraints for large regions of the model parameters. This feature should be taken into account in future model building.

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Section: Big Bang Nucleosynthesis Constraintsmentioning

confidence: 99%

Section: Big Bang Nucleosynthesis Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Big Bang Nucleosynthesis constraints on $f(T,T_G)$ gravity

Asimakis,

Saridakis,

Basilakos

et al. 2022

Preprint

Self Cite

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“…The theory has also been successfully confronted with various observational data sets coming from the CMBR, SNIa, BAO, redshift space distortion, etc [25][26][27][28][29]. Anagnostopoulos et al [30] showed that f (Q) gravity can safely pass the Big Bang Nucleosynthesis constraints. The behavior of the dynamical parameters of f (Q) gravity constrained by the scale factor and model parameters was studied in Refs.…”

Section: Introductionmentioning

confidence: 99%

Constraining Parameters for the Accelerating Models in Symmetric Teleparallel Gravity

A.¹,

Shekh

Mishra³

et al. 2023

Preprint

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“…Testing against a variety of recent background data, including Type Ia Supernovae, Pantheon data, Hubble data, etc., has been done to provide observational limits on the background behavior of numerous f (Q) models [37,38]. Furthermore, f (Q) gravity comfortably passes the constraints imposed by Big Bang Nucleosynthesis (BBN) [39]. Using reconstruction methods, F. Esposito et al [40] investigated exact isotropic and anisotropic cosmological solutions.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of $Λ$CDM Universe in $f(Q)$ Gravity

Gadbail,

Mandal,

Sahoo

2022

Preprint

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In this manuscript, we present a number of fascinating explicit reconstructions for the f (Q) gravity from the background of Friedmann-Laîmatre-Robertson-Walker (FLRW) evolution history. We find the more general functions of non-metricity scalar Q that admit exact ΛCDM expansion history. Adding extra degrees of freedom to the matter sector is the only method to get the scale factor to behave in this manner for more generic functions of Q. In addition, a cosmological reconstruction for modified f (Q) gravity is constructed in terms of e-folding. It is shown how any FLRW cosmology can arise from a specific f (Q) theory. We also reconstruct the well-known cosmological evolution for the specific examples of ΛCDM cosmology.

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New models and Big Bang Nucleosynthesis constraints in $f(Q)$ gravity

Cited by 9 publications

References 55 publications

Big Bang Nucleosynthesis constraints on $f(T,T_G)$ gravity

Big Bang Nucleosynthesis constraints on $f(T,T_G)$ gravity

Constraining Parameters for the Accelerating Models in Symmetric Teleparallel Gravity

Reconstruction of $Λ$CDM Universe in $f(Q)$ Gravity

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