2 papers
astro-ph.GA2025
Microlensing Black Hole Shadows-II: Constraining Primordial Black Hole Dark Matter using the photon rings of M87 and Sgr A*
Himanshu Verma, Priyanka Sarmah, Joseph Silk +1
The resolution of photon rings of Sgr~A and M87 is the next milestone of upcoming EHT-like interferometries. We extend the formalism developed in our previous work~\cite{Verma:…
astro-ph.CO2025
Probing memory-burdened Primordial Black Holes with global 21 cm signal
Priyanka Sarmah, Kingman Cheung
We investigate the imprints of memory-burdened primordial black holes (PBH) on the global 21 cm signal during the cosmic dawn. Recent studies reopened the possibility of a mass win…