3 papers
astro-ph.HE2021
Polarimetric signatures of the photon ring of a black hole that is pierced by a cosmic axion string
Alexander Gußmann
A black hole image contains a bright ring of photons that have closely circled the black hole on their way from the source to the detector. Here, we study the photon ring of a rota…
gr-qc2020
Scattering of axial gravitational wave pulses by monopole black holes and QNMs
Alexander Gußmann
We study scattering of short Gaussian pulses of axial gravitational waves by a black hole that has swallowed one or more global monopoles. We show how the response of the black hol…
hep-th2018
Bulk-boundary correspondence between charged, anyonic strings and vortices
Alexander Gußmann, Debajyoti Sarkar, Nico Wintergerst
We discuss a unified framework of dealing with electrically charged, anyonic vortices in 2+1 dimensional spacetimes and extended, anyonic string-like vortices in one higher dimensi…