29 March 2021

Space Science at Droptower SEMINAR TALK

Location: ZARM Bremen - Online seminar
When: 29.3.2021, 17:00 CET - Online

Speaker: Oleg Tsupko (Space Research Institute, Russian Academy of
Sciences, Moscow, Russia)

Title: Black hole shadow as a standard ruler in cosmology

Abstract: Advancements in the black hole shadow observations may
allow us not only to investigate physics in the strong gravity
regime, but also to use them in cosmological studies. We propose
to use the shadow of supermassive black holes as a standard ruler
for cosmological applications, assuming the black hole mass can
be determined independently. First, observations at low redshift
distances can be used to constrain the Hubble constant independently.
Secondly, the angular size of shadows of high redshift black holes
is increased due to cosmic expansion and may also be reachable
with future observations. -- This talk is  based on joint work
with Z. Fan and G.S. Bisnovatyi-Kogan.