3 papers
astro-ph.CO2026
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…
astro-ph.CO2026
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…
astro-ph.CO2025
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…