22 citations · 126 across the 20 of their papers we have counts for
20 papers
Overview of 21cm Experiments at high redshift with SKAO
CD Science Working Group, Gianni Bernardi, Daniela Breitman +81
We provide an overview of the eight SKAO Science Book chapters that motivate the Epoch of Reionisation and Cosmic Dawn experiments with SKA-Low. We describe the individual SKA-Low…
Constraining Primordial Black Holes via p-wave annihilation in light of CMB Spectral Distortion and 21-cm global signal
Shibsankar Si, Pravin Kumar Natwariya, Alekha C. Nayak
Primordial black holes (PBHs) can form spike density halos through the accretion of weakly interacting massive particles (WIMPs). In these halos, the enhanced density significantly…
Axion-Photon Conversion In Magnetized Universe: Impact On The Global 21-cm Signal
Pravin Kumar Natwariya, Vivekanand Mohapatra, Hriditi Howlader
The reported anomalous global 21-cm signal from the cosmic dawn era by Experiment to Detect the Global Epoch of Reionisation Signature (EDGES) could hint towards new phy…
Sensitivity toward dark matter annihilation imprints on 21-cm signal with SKA-Low: A convolutional neural network approach
Pravin Kumar Natwariya, Kenji Kadota, Atsushi J. Nishizawa
This study investigates the sensitivity of the radio interferometers to identify imprints of spatially inhomogeneous dark matter annihilation signatures in the 21-cm signal during…
Constraining self-interacting ultrahigh-energy muon neutrinos by cosmic microwave background spectral distortion
Pravin Kumar Natwariya, Shibsankar Si, Alekha C. Nayak +1
The neutrino telescopes have firmly established the existence of ultrahigh-energy neutrinos. Observations of these neutrinos offer a unique probe of neutrino self-interactions. Thi…
Revisiting constraints on superconducting cosmic strings in light of Dark Ages global 21-cm signal
Shibsankar Si, Vivekanand Mohapatra, Pravin kumar Natwariya +1
The Superconducting Cosmic Strings (SCS) are a special case of cosmic strings that have a core carrying a charged field. When SCS passes through magnetized regions, the charged par…
Machine Learning Constraints on Dark Matter Annihilation during the Epoch of Reionization: A CNN Analysis of the 21-cm Signal
Atsushi J. Nishizawa, Pravin Kumar Natwariya, Kenji Kadota
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…
Constraining Viscous Dark Matter in light of CMB Spectral Distortion
Shibsankar Si, Alekha C. Nayak, Pravin Kumar Natwariya
We calculate the - and \textit{y}-type spectral distortions of Cosmic Microwave Background (CMB), taking a non-standard interaction between baryons and viscous dark matter. Usin…
Primordial Magnetic Fields in Light of Dark Ages Global 21-cm Signal
Vivekanand Mohapatra, Pravin Kumar Natwariya, Alekha C. Nayak
We study the constraints on primordial magnetic fields (PMFs) in light of the global 21-cm signal observed during the dark ages. Primordial magnetic fields can heat the intergalact…
Formation of a Bose Star in a Rotating Cloud
Kuldeep J. Purohit, Pravin Kumar Natwariya, Jitesh R. Bhatt +1
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-ord…
In Search of Global 21-cm Signal using Artificial Neural Network in light of ARCADE 2
Vivekanand Mohapatra, Johnny J, Pravin Kumar Natwariya +2
Understanding the astrophysical nature of the first stars remains an unsolved problem in cosmology. The redshifted global 21-cm signal acts as a treasure trove to prob…
21 cm Line Astronomy and Constraining New Physics
Pravin Kumar Natwariya
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 predomin…
Bounds on sterile neutrino lifetime and mixing angle with active neutrinos by global 21 cm signal
Pravin Kumar Natwariya, Alekha C. Nayak
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 inje…
Rotating Scalar Field and Formation of Bose Stars
Kuldeep J. Purohit, Pravin Kumar Natwariya, Jitesh R. Bhatt +1
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 th…
Constraining spinning primordial black holes with global 21-cm signal
Pravin Kumar Natwariya, Alekha C. Nayak, Tripurari Srivastava
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…
Constraint on Primordial Magnetic Fields In the Light of ARCADE 2 and EDGES Observations
Pravin Kumar Natwariya
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 A…
EDGES signal in presence of magnetic fields
Pravin Kumar Natwariya, Jitesh R. Bhatt
We study the 21-cm differential brightness temperature in the presence of primordial helical magnetic fields for redshift . We argue that the -effect that sets in at ea…
Magnetic fields in a hot dense neutrino plasma and the Gravitational Waves
Arun Kumar Pandey, Pravin Kumar Natwariya, Jitesh R Bhatt
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…
Viscosity in cosmic fluids
Pravin Kumar Natwariya, Jitesh R Bhatt, Arun Kumar Pandey
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 vi…
Baryon-Dark matter interaction in presence of magnetic fields in light of EDGES signal
Jitesh R. Bhatt, Pravin Kumar Natwariya, Alekha C. Nayak +1
We have shown that in presence of a cosmic magnetic field the bounds on baryon dark matter cross-section (), dark-matter mass () and values of the magnetic field ($B_0…