Zobrazeno 1 - 10
of 316
pro vyhledávání: '"Banerjee, Narayan"'
In this work, we investigate the particle creation rate in a dynamical (Vaidya) spacetime using Feynman's path integral formalism within the framework of the effective action approach. We analyze particle production rates in the region of dynamical h
Externí odkaz:
http://arxiv.org/abs/2410.12436
We investigate the interaction between the dark sectors from a dynamical systems perspective. A general setup for interacting dark energy models that incorporates both quintessence and phantom fields through a switch parameter, allowing an interactio
Externí odkaz:
http://arxiv.org/abs/2405.10604
Autor:
Dinda, Bikash R., Banerjee, Narayan
Publikováno v:
Eur. Phys. J. C (2024) 84:688
For the first time, we reconstruct the dark energy equation of the state parameter $w$ from the combination of background and perturbation observations, specifically combining the Hubble parameter data from cosmic chronometer observations and the log
Externí odkaz:
http://arxiv.org/abs/2403.14223
Based on recent data about the history of the Hubble factor, it is argued that the second law of thermodynamics holds at the largest scales accessible to observation. This is consistent with previous studies of the same question.
Comment: 11 pag
Comment: 11 pag
Externí odkaz:
http://arxiv.org/abs/2309.12298
Autor:
Dinda, Bikash R., Banerjee, Narayan
Publikováno v:
Eur. Phys. J. C (2024) 84:177
We consider a particular k-essence scalar field model for the late-time cosmic acceleration in which the sound speed, parametrized as $c_s$ is constant. We compute the relevant background and perturbation quantities corresponding to the observables l
Externí odkaz:
http://arxiv.org/abs/2309.10538
The ``ugly duckling'' of the Segr\'e-Pleba\'nski-Hawking-Ellis classification of stress-energy tensors is believed to be either impossible or extremely difficult to realise in Einstein gravity. Effective stress-energy tensors in alternative gravity o
Externí odkaz:
http://arxiv.org/abs/2307.13846
Publikováno v:
Eur. Phys. J. C 83, 815 (2023)
Using the Hayward-Kodama temperature for the apparent horizon, it is found that matter content in the Universe is not thermodynamically stable, and the entry to the late accelerated expansion is actually a second order phase transition. The cosmologi
Externí odkaz:
http://arxiv.org/abs/2303.14031
Publikováno v:
Mon. Not. R. Astron. Soc. 521, 5473 (2023)
Reasonable parametrizations of the current Hubble data set of the expansion rate of our homogeneous and isotropic universe, after suitable smoothing of these data, strongly suggests that the area of the apparent horizon increases irrespective of whet
Externí odkaz:
http://arxiv.org/abs/2301.09823
Autor:
Dinda, Bikash R., Banerjee, Narayan
Publikováno v:
Phys. Rev. D 107, 063513, 2023
We put constraints on the peak absolute magnitude, $M_B$ of type Ia supernova using the Pantheon sample for type Ia supernova observations and the cosmic chronometers data for the Hubble parameter by a model independent and non-parametric approach. O
Externí odkaz:
http://arxiv.org/abs/2208.14740
Autor:
Mukherjee, Purba, Banerjee, Narayan
Publikováno v:
Phys. Rev. D 105, 063516 (2022)
The cosmic curvature density parameter has been constrained in the present work independent of any background cosmological model. The reconstruction is performed adopting the non-parametric Gaussian Processes (GP). The constraints on $\Omega_{k0}$ ar
Externí odkaz:
http://arxiv.org/abs/2202.07886