Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Adil Shahnawaz"'
In recent years, the Lambda Cold Dark Matter (LCDM) model, which has been pivotal in cosmological studies, has faced significant challenges due to emerging observational and theoretical inconsistencies. This paper explores alternative cosmological mo
Externí odkaz:
http://arxiv.org/abs/2406.06757
The Hubble constant, $H_0$, tension is the tension among the local probes, Supernovae Ia, and the Cosmic Microwave Background Radiation. It has been almost a decade, and this tension still puzzles the community. Here, we add intermediate redshift pro
Externí odkaz:
http://arxiv.org/abs/2405.01452
Publikováno v:
JCAP 2407 (2024) 072
Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts $z \gtrsim 5$: these observations are in tension with the predictions not only of
Externí odkaz:
http://arxiv.org/abs/2401.12659
Publikováno v:
JCAP 2310 (2023) 072
Early data from the James Webb Space Telescope (JWST) has uncovered the existence of a surprisingly abundant population of very massive galaxies at extremely high redshift, which are hard to accommodate within the standard $\Lambda$CDM cosmology. We
Externí odkaz:
http://arxiv.org/abs/2307.12763
Autor:
Adil, Shahnawaz A., Akarsu, Ozgur, Di Valentino, Eleonora, Nunes, Rafael C., Ozulker, Emre, Sen, Anjan A., Specogna, Enrico
This paper introduces the class of omnipotent dark energy (DE) models characterized by nonmonotonic energy densities that are capable of attaining negative values with corresponding equation of state parameters featuring phantom divide line (PDL) cro
Externí odkaz:
http://arxiv.org/abs/2306.08046
Autor:
Adil, Shahnawaz A., Akarsu, Özgür, Malekjani, Mohammad, Colgáin, Eoin Ó, Pourojaghi, Saeed, Sen, Anjan A., Sheikh-Jabbari, M. M.
Hubble constant $H_0$ and weighted amplitude of matter fluctuations $S_8$ determinations are biased to higher and lower values, respectively, in the late Universe with respect to early Universe values inferred by the Planck collaboration within flat
Externí odkaz:
http://arxiv.org/abs/2303.06928
Bimetric gravity is an interesting alternative to standard GR given its potential to provide a concrete theoretical framework for a ghost-free massive gravity theory. Here we investigate a class of Bimetric gravity models for their cosmological impli
Externí odkaz:
http://arxiv.org/abs/2301.11000
In view of the recent measurement of $H_{0}$ from HST and SH0ES team, we explore the possibility of existence of a negative cosmological constant (AdS vacua in the dark energy sector) in the Universe. In this regard, we consider quintessence fields o
Externí odkaz:
http://arxiv.org/abs/2112.10641
We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The possibility is realized by assuming an interaction between dark matter and
Externí odkaz:
http://arxiv.org/abs/2106.03093
The present work deals with a dark energy model that has an oscillating scalar field potential along with a cosmological constant (CC). The oscillating part of the potential represents the contribution of a light axion field in the dark energy that h
Externí odkaz:
http://arxiv.org/abs/2005.08813