Johan Samsing & Daniel D’Orazio Probing Black Holes with Electromagnetic and Gravitational Wave Obs.
GUEST LECTURE
Assistant Professor Johan Samsing and Assistant Professor Daniel D'Orazio from Niels Bohr International Academy visited DIAS for a joint lecture about how to probe black holes both through electromagnetic observations and gravitational waves.
The pioneering detections of gravitational waves (GWs) from the coalescence of black holes (BHs) by LIGO/Virgo mark a new era in physics. To date a few dozen binary BH mergers have been observed in this way, but how and where they form in our Universe are still major unsolved problems, which not only require upcoming data to solve, but also new ideas. In the first part of the talk Assist. Prof. J. Samsing will provide recent updates to this new and emerging field, and provide insight and possible solutions to these outstanding questions. In the second part of the talk, Assist. Prof. D. D'Orazio will move on to the supermassive binary BHs that are expected to lurk in the centers of galaxies. Supermassives are the subject of a long standing mystery in astrophysics: will they merge and what can that tell us about their co-evolution with host galaxies and the astrophysical environments that shape them? D. D'Orazio will illustrate how upcoming GW and electromagnetic searches, as well as advances in theoretical modeling, will soon illuminate this long standing issue.
Content of the video
00:00 - Introduction
02:50 - Presentation outline
03:40 - Observing gravitational waves
08:45 - Black holes merging
12:18 - An extraordinary source
16:45 - Origin of GW190521
20:54 - Gravitational waves in the future
21:35 - Intermission with one question from the audience
23:25 - The electromagnetic spectrum
26:16 - Future projects probing the low frequency gravitational wave sky
33:38 - Periodic light curve searches
40:19 - Meet Spikey: Self-lensing candidate
42:03 - Outlook
43:01 - Summary slide
43:39 - Questions from the audience
About Johan Samsing:
Johan received his PhD from the Niels Bohr Institute in 2014 in theoretical astrophysics. After that he moved to Princeton University, where he did his postdoctoral studies from 2014-2019 as an Einstein Fellow and Lyman Spitzer Fellow. Johan joined the Niels Bohr International Academy in 2019, where he is now Louis-Hansen Assistant Prof. and Villum Young Investigator.
Johan works in the new field of gravitational wave astrophysics. His current research relates to how black hole mergers might form through dynamical interaction, and how we can probe the origin of binary black holes using gravitational waves.
About Daniel D’Orazio:
Daniel received his PhD in 2016 from Columbia University. Afterwards he was awarded a NASA Einstein Postdoctoral Fellowship and an Institute for Theory and Computation Fellowship at Harvard University until joining the Niels Bohr International Academy as an Assistant Professor in 2020.
Daniel’s research lies at the interface of theory and observation and spans a wide range of topics in high energy astrophysics. His primary interests lie in harnessing tools of multi-messenger astrophysics for uncovering the origin of compact-object-binary sources of gravitational radiation, spanning the mass scale from neutron stars up to supermassive black hole binaries.
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