https://doi.org/10.1140/epjp/s13360-024-04965-y
Regular Article
On inflation and axionic dark matter in a scaled gravity
1
Département de Physique, Equipe des Sciences de la matière et du rayonnement, ESMaR, Faculté des Sciences, Université Mohammed V de Rabat, Rabat, Morocco
2
LPHE-MS, Faculté des Sciences, Université Mohammed V de Rabat, Rabat, Morocco
Received:
31
October
2023
Accepted:
31
January
2024
Published online:
9
February
2024
Motivated by the modified gravity theories 
and inflationary physics, we first propose and investigate an inflation model in a scaled gravity 
, where 
is a dimensionless scaling parameter. The latter is also implemented in a particular potential ![$$V(\phi )=M^{4}\left[ 1-\cos \left( \frac{\phi }{\mu }\right) ^{\beta }\right] $$](/articles/epjplus/abs/2024/02/13360_2024_Article_4965/13360_2024_Article_4965_tex_eq4.png)
being considered to drive the inflation via a parameter coupling scenario. Using the slow-roll approximations, the gravity scale parameter is approached with respect to the range of the associated computed cosmological observables 
and r according to the recent Planck and BICEP/Keck data. Then, we discuss the axionic dark matter in the suggested gravity model by considering the case where the inflaton is taken to be identified with an axion-like field 
with the decay constant 
. Referring to the known data, the underlying inflation scale M is constrained to be much lower than the corresponding axion scale 
.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
