Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Hossain, Md. Wali"'
Autor:
Akthar, Shiriny, Hossain, Md. Wali
We present a general parametrization for energy density of a quintessence field, a minimally coupled canonical scalar field which rolls down slowly during the late time. This parametrization can mimic all classes of quintessence dynamics, namely scal
Externí odkaz:
http://arxiv.org/abs/2411.15892
In this paper, we introduce a unified model of early and late dark energy. We call it {\it quintessential early dark energy} model in which early and late dark energy are explained by a single scalar field. In other words two different energy scales
Externí odkaz:
http://arxiv.org/abs/2408.03229
Autor:
Hossain, Md. Wali, Maqsood, Afaq
Publikováno v:
Phys. Rev. D {\bf 109}, 103512 (2024)
In this paper, we compare the scalar field dynamics in axion-like and power law potentials for both positive and negative values of the exponents. We find that, for positive exponents, both the potentials exhibit similar scalar field dynamics and it
Externí odkaz:
http://arxiv.org/abs/2311.17825
Publikováno v:
J. Astrophys. Astr. (2023) 44:85
We show the detectability of interacting and non-interacting cubic Galileon models from the $\Lambda$CDM model through the 21 cm power spectrum. We show that the interferometric observations like the upcoming SKA1-mid can detect both the interacting
Externí odkaz:
http://arxiv.org/abs/2208.11560
Publikováno v:
Universe 2021, 7, 167
We revisit the cosmological dynamics of the cubic Galileon model in light of the recently proposed model-independent analyses of the Pantheon supernova data. At the background level, it is shown to be compatible with data and preferred over standard
Externí odkaz:
http://arxiv.org/abs/2007.06425
Publikováno v:
Phys. Rev. D 102, 043510 (2020)
We use N-body simulation to study the structure formation in the Cubic Galileon Gravity model where along with the usual kinetic and potential term we also have a higher derivative self-interaction term. We find that the large scale structure provide
Externí odkaz:
http://arxiv.org/abs/2004.12659
Publikováno v:
Phys. Rev. D 100, 086017 (2019)
For any quasi de Sitter background, we show that a recently proposed scalar weak gravity conjecture (sWGC) follows from the swampland distance conjecture, together with the covariant entropy bound. While pointing out the limitations of our argument,
Externí odkaz:
http://arxiv.org/abs/1904.05810
Publikováno v:
JHEP 06 (2019) 070
The string theory swampland proposes that there is no UV-completion for an effective field theory with an exact (metastable) de Sitter vacua, thereby ruling out standard $\Lambda$CDM cosmology if the conjecture is taken seriously. The swampland crite
Externí odkaz:
http://arxiv.org/abs/1902.11014
Publikováno v:
JHEP 03 (2019) 006
One class of single-field inflationary models compatible with the recently-conjectured Swampland criteria would be those in which a Hubble slow-roll parameter $\epsilon_\text{H}$ is not the same as $\epsilon_\text{V} \sim (V'/V)^2$. However, a roadbl
Externí odkaz:
http://arxiv.org/abs/1809.01277
Publikováno v:
Phys. Rev. D 99, 043504 (2019)
In this paper, we have studied bi-gravity theory in a very specific limit where we focused only on one degree of freedom generated by the massive graviton. We have analyzed the model in the context of cosmology and demonstrated that the model can giv
Externí odkaz:
http://arxiv.org/abs/1808.04137