Research Interest
- High-energy cosmic rays, neutrinos, gamma-rays
- Multi-messenger probes of dark matter
- Active Galactic Nuclei & Blazar properties
- Gamma-ray Burst and GW connection
Overview
I work on theoretical high-energy astrophysics. In my PhD, we studied the origin and propagation of ultrahigh-energy cosmic rays (UHECRs; $E\gtrsim10^{17}$ eV), the astrophysical properties of their accelerators and explaining the observed spectrum, mass composition and anisotropy. We have estimated the observed secondary cosmogenic photon and neutrino fluxes to restrict the allowed source models.
Another interesting problem is the origin of the astrophysical neutrino signal observed by the IceCube neutrino observatory. We tried to explain the diffuse TeV-PeV neutrinos and its connection to photohadronic ($p\gamma$) or hadronuclear ($pp$) processes in Fermi-LAT detected blazars. Line-of-sight UHECR interactions are also found to explain VHE gamma-ray emission from blazars and $\gamma$-ray bursts.
I have also worked on constraining the timescale of superheavy dark matter decay from multi-messenger signals. Currently, I am modeling the observed multiwavelength spectral energy distribution (SED) and neutrino flux from tidal disruption events (TDEs). I am interested in working on Galactic/extragalactic cosmic rays, gamma-ray and neutrino astrophsyics, the connection between short gamma-ray bursts (sGRB) and gravitational wave (GW) events stemming from compact binary mergers, etc.
I am familiar with Python and C programming language, multiprocessing, and public simulations for cosmic ray propagation, electromagnetic cascades, etc. I have written numerical codes for lepto-hadronic emission in blazar jets for modeling the non-thermal emission. I have also done analytical calculations for the absorption of high-energy gamma rays in the Galactic radiation fields and prompt dark matter decay.
