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Astrophysics, Gravitation and Cosmology Seminar - Keisuke Inomata (KICP/Chicago) "Enhancement mechanism of gravitational waves induced by scalar perturbations"

Event Type
Seminar/Symposium
Sponsor
Department of Physics
Location
Via Zoom
Virtual
wifi event
Date
Oct 6, 2021   12:00 pm  
Speaker
Keisuke Inomata (KICP/Chicago)
Contact
Brandy Koebbe
E-Mail
bkoebbe@illinois.edu
Views
52
Originating Calendar
Physics - Astrophysics, Gravitation, and Cosmology Seminar

The scalar perturbations, the origin of the CMB anisotropies and the large scale structure, can induce gravitational waves (GWs) through the interaction at second order in perturbations. This kind of GW has a lot of attention recently because it can be used to investigate small-scale scalar perturbations, which could produce primordial black holes (PBHs) as dark matter and BHs detected by LIGO-Virgo collaborations. In this seminar, I will talk about the enhancement of the induced GWs, which occurs right after a sudden reheating at the end of the early matter-dominated era. This enhancement mechanism is named the “Poltergeist mechanism”. The induced GWs are much enhanced due to the fast oscillation of the subhorizon scalar perturbations after the reheating. This kind of GW enhancement could happen right after a PBH-dominated era.

References: arXiv:1904.12879, 1904.12878, 2003.10455.

 

 

 

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