[astroseminar at Sapienza] Gravity theory webinar Wed Nov 4th @4pm: Vishal Baibhav (Johns Hopkins University)

[Paolo Pani]

Dear All,

next Wednesday (*Nov 4th at 4pm*) there will be a webinar by Vishal Baibhav
(Johns Hopkins University):


*The mass gap, the spin gap, and the origin of merging binary black holes*
Two of the dominant channels to produce the black-hole binary mergers
observed by LIGO and Virgo are believed to be the isolated evolution of
stellar binaries in the field and dynamical formation in star clusters.
Their relative efficiency can be characterized by a “mixing fraction.” Pair
instabilities prevent stellar collapse from generating black holes more
massive than about 45 M_sun . This “mass gap” only applies to the field
formation scenario, and it can be filled by repeated mergers in clusters.
Similar reasoning applies to the binary’s effective spin. If black holes
are born slowly rotating, the high-spin portion of the parameter space (the
“spin gap”) can only be populated by black hole binaries that were
assembled dynamically. In this talk, I will show how future
gravitational-wave events in either the mass gap, the spin gap, or both can
be leveraged to infer the mixing fraction between the field and cluster
formation channels. I will also discuss how recent detections, GW190521 and
GW190412, fit in this context.

Zoom link:
https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
ID meeting: 812 8370 7469
Passcode: 915450

This and future gravity theory seminars are also available at this public
calendar:
https://docs.google.com/document/d/1KRW5GYCzd2yQQxscSNIb7syQ7HTA2RTH1HL5QL6Me8k/edit?ts=5e7d02d1

Cheers,
Paolo

-- 
Paolo Pani
Associate Professor
ERC StG Fellow, DarkGRA project
Junior Fellow, Scuola Superiore di Studi Avanzati Sapienza

Physics Department (Marconi Building), 2nd floor, room 253
Sapienza University of Rome
Piazzale Aldo Moro 5 - 00185 Rome (Italy)
+39 06 4991 4276 (int 24276)

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