Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Mittal, Shikhar"'
Publikováno v:
MNRAS 534 (2024) 1317
Contribution of resolved and unresolved extragalactic point sources to the low-frequency sky spectrum is a potentially non-negligible part of the astrophysical foregrounds for cosmic dawn 21-cm experiments. The clustering of such point sources on the
Externí odkaz:
http://arxiv.org/abs/2406.17031
Publikováno v:
MNRAS 535 (2024) 1979
Lyman-$\alpha$ photons enable the cosmic dawn 21-cm signal through a process called the Wouthuysen-Field effect. An accurate model of the signal in this epoch hinges on the accuracy of the computation of the Ly$\alpha$ coupling, which requires one to
Externí odkaz:
http://arxiv.org/abs/2311.03447
Autor:
Mittal, Shikhar, Kulkarni, Girish
Publikováno v:
MNRAS 515 (2022) 2901
Apart from its anomalously large depth, the cosmological 21-cm absorption signal measured by the EDGES collaboration also has a shape that is distinctly different from theoretical predictions. Models with non-traditional components such as super-adia
Externí odkaz:
http://arxiv.org/abs/2203.07733
Autor:
Mittal, Shikhar, Kulkarni, Girish
Publikováno v:
MNRAS 510 (2022) 4992
We compute the isotropic radiation background due to Hawking emission from primordial black holes (PBHs), and examine if this background is a viable option in explaining the excess radiowave background observed by the ARCADE2 and LWA1 experiments at
Externí odkaz:
http://arxiv.org/abs/2110.11975
Publikováno v:
JCAP 03 (2022) 030
Using the global 21-cm signal measurement by the EDGES collaboration, we derive constraints on the fraction of the dark matter that is in the form of primordial black holes (PBHs) with masses in the range $10^{15}$-$10^{17}\,$g. Improving upon previo
Externí odkaz:
http://arxiv.org/abs/2107.02190
Autor:
Mittal, Shikhar, Kulkarni, Girish
Publikováno v:
MNRAS 503 (2021) 4264
The global 21-cm signal from the cosmic dawn is affected by a variety of heating and cooling processes. We investigate the impact of heating due to Lyman-$\alpha$ (Ly~$\alpha$) photons on the global 21-cm signal at cosmic dawn using an analytical exp
Externí odkaz:
http://arxiv.org/abs/2009.10746
Autor:
Mittal, Shikhar
In this work, I have derived the equation of the curve obtained on reflection of a point object in an arbitrary curved mirror if the object and the mirror are placed on the 2D Cartesian plane. I have used only the basic laws of reflection of classica
Externí odkaz:
http://arxiv.org/abs/1903.01074
Publikováno v:
Eur. J. Phys. 41 (2020) 055401 (19pp)
The Markov chain Monte Carlo (MCMC) method is used to evaluate the imaginary-time path integral of a quantum oscillator with a potential that includes both a quadratic term and a quartic term whose coupling is varied by several orders of magnitude. T
Externí odkaz:
http://arxiv.org/abs/1811.04669
Publikováno v:
In Journal of Non-Newtonian Fluid Mechanics September 2016 235:29-46
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