arXiv subjects

Athar Husain

Publications and source records attributed to Athar Husain.

5 recordsLinked to original sources

arXiv2000

Cosmic Tau Neutrinos

The collisions between accelerated protons and the photons present in cosmos can be a main source of high-energy neutrinos (E \geq 10^6 GeV) of all flavors above the atmospheric neutrino background. I discuss here the possibility of photohadronic production of high-energy cosmic tau neutrinos in an astrophysical site and study some of the effects of vacuum neutrino flavor mixing on their subsequent propagation. I also discuss the prospects for observations of these high-energy cosmic tau neutrinos in new large neutrino telescopes

hep-ph↗

arXiv2000

Neutrino Conversions in Active Galactic Nuclei

I discuss the possibility of production of high energy cosmic neutrinos (E \geq 10^{6} GeV) in cores of active galactic nuclei and study some of the effects of neutrino mixing on their subsequent propagation. I also discuss the prospects for observations of these high energy cosmic neutrinos in new km^{2} surface area underwater/ice neutrino telescopes.

hep-ph↗

arXiv1999

High Energy Cosmic Tau Neutrinos

I discuss the possibility of production of high energy cosmic tau neutrinos ($E \geq 10^{6}$ GeV) in an astrophysical site and study some of the effects of neutrino mixing on their subsequent propagation. I also discuss the prospects for observations of these high energy cosmic tau neutrinos through double shower events in new km$^{2}$ surface area under water/ice neutrino telescopes.

hep-ph↗

arXiv1999

Spin-flavour conversions of neutrinos in collapsing stars

I discuss in some detail the spin-flavour conversions of neutrinos in the almost isotopically neutral region of collapsing stars along with the resulting experimental signatures. In particular, I show that for realistic magnetic field strength, the observable effects may exist for neutrino magnetic moment, $μ\sim (2-3)\times 10^{-14}μ_B$ ($μ_B$ is the Bohr magneton) with relevant neutrino mass squared difference, $Δm^2 \sim (10^{-9}-10^{-8}) eV^2$.

hep-ph↗

arXiv1998

Tau neutrinos from active galactic nuclei

We study the appearance of $ν_τ$ from active galactic nuclei (AGN) through neutrino spin-flip. We consider two situations: i) Spin (flavour)-precession in a reasonable strength of magnetic field in AGN, $B_{AGN}$ ii) Adiabatically resonant conversions caused by an interplay of $B_{AGN}$ and the violation of equivalence principle. Observational consequences for both situations are discussed.

hep-ph↗