Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Natwariya, Pravin Kumar"'
We explore the impact of dark matter annihilation on the 21-cm signal during the cosmic dawn and epoch of reionization (EoR). Using modified 21cmFAST simulations and convolutional neural networks (CNNs), we investigate how energy injected into the in
Externí odkaz:
http://arxiv.org/abs/2410.04755
We calculate the $\mu$- and \textit{y}-type spectral distortions of Cosmic Microwave Background (CMB), taking a non-standard interaction between baryons and viscous dark matter. Using the CMB spectral distortion observations, we can constrain any exo
Externí odkaz:
http://arxiv.org/abs/2404.13271
We study the constraints on the primordial magnetic fields in light of Dark Ages global 21-cm signal. An early absorption signal in the redshift of $200 \leq z \leq 30$ is predicted in the $\Lambda\rm CDM$ model of cosmology. During the Dark Ages, th
Externí odkaz:
http://arxiv.org/abs/2402.18565
Publikováno v:
Astrophys Space Sci 368, 97 (2023)
In this paper, we study the evolutions of a self-gravitating cloud of bosonic dark matter with finite angular momentum and self-interaction. This is achieved by using the sixth-order pseudospectral operator splitting method to solve the system of non
Externí odkaz:
http://arxiv.org/abs/2311.12789
Understanding the astrophysical nature of the first stars still remains an unsolved problem in cosmology. The redshifted global 21-cm signal $(\text{T}_{21})$ acts as a treasure trove to probe the Cosmic Dawn era -- when the intergalactic medium was
Externí odkaz:
http://arxiv.org/abs/2306.02039
Autor:
Natwariya, Pravin Kumar
The 21 cm signal appears to be a treasure trove to provide an insight into the period when the first generation of luminous objects formed in the Universe. Hydrogen is the predominating fraction of the total baryonic matter during cosmic dawn (CD). T
Externí odkaz:
http://arxiv.org/abs/2301.02655
Publikováno v:
Physics Letters B 827, 136955 (2022)
Sterile neutrinos can be a possible candidate for dark matter. Sterile neutrinos are radiatively unstable and can inject photon energy into the intergalactic medium (IGM). The injection of photon energy into IGM can modify the temperature and ionizat
Externí odkaz:
http://arxiv.org/abs/2202.06007
We study numerical evolutions of an initial cloud of self-gravitating bosonic dark matter with finite angular momentum and self-interaction in kinetic regime. It is demonstrated that such a system can undergo gravitational condensation and form a Bos
Externí odkaz:
http://arxiv.org/abs/2109.02601
Publikováno v:
Mon. Not. R. Astron. Soc. 510, 4236 (2021)
We study the upper projected bounds on the dark matter fraction in the form of the primordial black holes (PBHs) with a non-zero spin by using the absorption feature in the global 21-cm signal at redshift z ~ 17. The mass and spin are fundamental pro
Externí odkaz:
http://arxiv.org/abs/2107.12358
Autor:
Natwariya, Pravin Kumar
Publikováno v:
Eur. Phys. J. C 81, 394 (2021)
We study the constraints on primordial magnetic fields (PMFs) in the light of the Experiment to Detect the Global Epoch of Reionization Signature (EDGES) low-band observation and Absolute Radiometer for Cosmology, Astrophysics and Diffuse Emission (A
Externí odkaz:
http://arxiv.org/abs/2007.09938