APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Philipp Podsiadlowski (U Oxford)
Title: The formation of massive black-hole binaries: understanding the Advanced LIGO detections
Date: Tue, Sep 19, 2017, 12:00 - 13:00
Place: Lecture Hall
Abstract: The Advanced LIGO (aLIGO) gravitational-wave detector has reported the discovery of the first direct detection of gravitational waves confirming Einstein’s Theory of General Relativity in its extreme limit. All sources of these gravitational waves detected so far were caused by the merging of two massive stellar-mass black holes.

In this talk I will first briefly summarize the main aLIGO results and then discuss in detail the three main channels that have been proposed to explain their origin, involving
(1) dynamical formation,
(2) common-envelope evolution, and
(3) chemical homogeneous evolution (CHE),
and how it may be possible to distinguish among these models.

I will then focus on the CHE formation model, showing recent results from our own work, including cosmological simulations and their implications for the future detection of intermediate-mass black-hole mergers, gamma-ray bursts, pair-instability supernovae and neutron-star/black-hole mergers. The model also has applications to ultra-luminous X-ray sources, in particular the most luminous ones.