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  • Baryon-Dark matter interaction in presence of magnetic fields in light of EDGES signal 
    Bhatt, Jitesh R.; Natwariya, Pravin Kumar; Nayak, Alekha C.; Pandey, Arun Kumar (Springer, 2020-04)
    We have shown that in presence of a cosmic magnetic field the bounds on baryon dark matter cross-section (σ^), dark-matter mass (md) and values of the magnetic field (B0) can strongly influence each other. This requires ...
  • Bounds on sterile neutrino lifetime and mixing angle with active neutrinos by global 21 cm signal 
    Natwariya, Pravin Kumar; Nayak, Alekha Chandra (Elsevier, 2022-04)
    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 ...
  • Constraining spinning primordial black holes with global 21-cm signal 
    Natwariya, Pravin Kumar; Nayak, Alekha C.; Srivastava, Tripurari (Royal Astronomical Society, 2022-03)
    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 ...
  • Constraint on primordial magnetic fields in the light of ARCADE 2 and EDGES observations 
    Natwariya, Pravin Kumar (SpringerOpen, 2021-05)
    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 ...
  • EDGES signal in the presence of magnetic fields 
    Natwariya, Pravin Kumar; Bhatt, Jitesh R. (Oxford University Press, 2020-09)
    We study the 21-cm differential brightness temperature in the presence of primordial helical magnetic fields for redshift z = 10�30. We argue that the ?-effect that sets in at earlier time can be helpful in lowering the ...
  • Magnetic fields in a hot dense neutrino plasma and the gravitational waves 
    Pandey, Arun Kumar; Natwariya, Pravin Kumar; Bhatt, Jitesh R. (American Physical Society, 2020-01)
    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 ...
  • Viscosity in cosmic fluids 
    Natwariya, Pravin Kumar; Bhatt, Jitesh R.; Pandey, Arun Kumar (Springer, 2020-08)
    The effective theory of large-scale structure formation based on 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 ...

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