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Dynamics of triple black hole systems in hierarchically merging massive galaxies
Loren Hoffman, Abraham Loeb
Galaxies with stellar bulges are generically observed to host supermassive black holes (SMBHs). The hierarchical merging of galaxies should therefore lead to the formation of SMBH…
Eavesdropping on Radio Broadcasts from Galactic Civilizations with Upcoming Observatories for Redshifted 21cm Radiation
Abraham Loeb, Matias Zaldarriaga
The question of whether intelligent life exists elsewhere is one of the fundamental unknowns about our Universe. Over the past decade more than 200 extra-solar planets have been di…
The Physics and Early History of the Intergalactic Medium
Rennan Barkana, Abraham Loeb
The intergalactic medium - the cosmic gas that fills the great spaces between the galaxies - is affected by processes ranging from quantum fluctuations in the very early universe t…
CMB Anisotropies from Outflows in Lyman Break Galaxies
Daniel Babich, Abraham Loeb
Thomson scattering of the Cosmic Microwave Background (CMB) on moving electrons in the outflows of Lyman Break Galaxies (LBGs) at redshifts 2-8 contributes to the small-scale CMB a…
Hypervelocity Collisions of Binary Stars at the Galactic Centre
Idan Ginsburg, Abraham Loeb
Recent surveys have identified seven hypervelocity stars (HVSs) in the halo of the Milky Way. Most of these stars may have originated from the breakup of binary star systems by the…
Production of Hypervelocity Stars through Encounters with Stellar-Mass Black Holes in the Galactic Centre
Ryan M. O'Leary, Abraham Loeb
Stars within 0.1 pc of the supermassive black hole Sgr A* at the Galactic centre are expected to encounter a cluster of stellar-mass black holes (BHs) that have segregated to that…