Výsledky vyhledávání - "Pandey, Arun Kumar"

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Thermal SZ effect in a magnetized IGM dominated by interacting DM decay/annihilation during dark ages

During cosmic dawn, the thermal history of the universe is well studied, and a study of this era can give us some of the most useful insight into the universe before the recombination epoch. Its precise modeling and future high-precision measurements

Externí odkaz: http://arxiv.org/abs/2204.08088

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Generating Seed magnetic field \`a la Chiral Biermann battery

Autor: Pandey, Arun Kumar, Anand, Sampurn

Publikováno v: Phys Review D 104, 063508 (2021)

Cosmological and astrophysical observations indicate the presence of magnetic field over all scales. In order to explain these magnetic fields, it is assumed that there exists a seed magnetic field that gets amplified by dynamos. These seed fields ma

Externí odkaz: http://arxiv.org/abs/2109.01579

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Gravitational waves in neutrino plasma and NANOGrav signal

Autor: Pandey, Arun Kumar

Publikováno v: European Physical Journal C, 81, 399 (2021)

The recent finding of the gravitational wave (GW) signal by the NANOGrav collaboration in the nHZ frequency range has opened up the door for the existence of stochastic GWs. In the present work, we have argued that in a hot dense neutrino asymmetric

Externí odkaz: http://arxiv.org/abs/2011.05821

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Implications of baryon-dark matter interaction on IGM temperature and tSZ effect with magnetic field

Autor: Pandey, Arun Kumar, Malik, Sunil, Seshadri, T. R.

We show that the combined effect of cosmic magnetic field and a possible non-standard interaction between baryons and dark matter has interesting consequences on the thermal Sunyaev$-$Zel${'}$dovich (tSZ) effect depending on the temperature and the i

Externí odkaz: http://arxiv.org/abs/2006.07901

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Magnetic fields in a hot dense neutrino plasma and the Gravitational Waves

Autor: Pandey, Arun Kumar, Natwariya, Pravin Kumar, Bhatt, Jitesh R

Publikováno v: Phys. Rev. D 101, 023531 (2020)

In the present work, we have studied the spectrum of the primordial gravitational waves due to magnetic instability in the presence of neutrino asymmetry. The magnetic instability generates a helical magnetic field on a large scale. The anisotropic s

Externí odkaz: http://arxiv.org/abs/1911.05412

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Viscosity in cosmic fluids

Autor: Natwariya, Pravin Kumar, Bhatt, Jitesh R, Pandey, Arun Kumar

Publikováno v: Eur. Phys. J. C 80, 767 (2020)

The effective theory of large-scale structure formation based on $\Lambda$CDM paradigm predicts finite dissipative effects in the resulting fluid equations. In this work, we study how viscous effect that could arise if one includes self-interaction a

Externí odkaz: http://arxiv.org/abs/1907.03445

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Baryon-Dark matter interaction in presence of magnetic fields in light of EDGES signal

Autor: Bhatt, Jitesh R., Natwariya, Pravin Kumar, Nayak, Alekha C., Pandey, Arun Kumar

Publikováno v: Eur. Phys. J. C 80, 334 (2020)

We have shown that in presence of a cosmic magnetic field the bounds on baryon dark matter cross-section ($\hat \sigma$), dark-matter mass ($m_d$) and values of the magnetic field ($B_0$) can strongly influence each other. This requires to rework the

Externí odkaz: http://arxiv.org/abs/1905.13486

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