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New models and big bang nucleosynthesis constraints in f(Q) gravity
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Journal Article
New models and big bang nucleosynthesis constraints in f(Q) gravity
2023
Overview
The
f
(
Q
) theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time Universe. We use the Big Bang Nucleosynthesis (BBN) formalism and observations in order to extract constraints on various classes of
f
(
Q
) models. In particular, we calculate the deviations that
f
(
Q
) terms bring on the freeze-out temperature
T
f
in comparison to that of the standard
Λ
CDM evolution, and then we impose the observational bound on
δ
T
f
T
f
to extract constraints on the involved parameters of the considered models. Concerning the polynomial model, we show that the exponent parameter should be negative, while for the power-exponential model and the new hyperbolic tangent-power model we find that they pass the BBN constraints trivially. Finally, we examine two DGP-like
f
(
Q
) models, and we extract the bounds on their model parameters. Since many gravitational modifications, although able to describe the late-time evolution of the Universe, produce too-much modification at early times and thus fall to pass the BBN confrontation, the fact that
f
(
Q
) gravity can safely pass the BBN constraints is an important advantage of this modified gravity class.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V,SpringerOpen
