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Seminar
Speaker
Apratim Ganguly (ICTS-TIFR, Bangalore)
Date & Time
Fri, 31 January 2020, 11:30 to 12:30
Venue
Emmy Noether Seminar Room, ICTS Campus, Bangalore
Resources
Abstract

Massive astrophysical compact halo objects (MACHOs) are viable compact dark matter (DM) candidates, the presence of which in the interstellar medium will lead to lensing of electromagnetic (EM)/gravitational-wave (GW) signals. Various EM lensing searches have constrained the DM density fraction, f_DM, in the form of MACHOs better than f_DM < 10^(−5) in the mass range < 10^(-16) M_sun and > 10^5 M_sun. On the other hand, LIGO-Virgo detectors (10Hz < f < 100Hz) are well suited to probe MACHOs in the mass range 10 − 10^5 M_sun via GW lensing. The lensed lens waveform will have a frequency dependent magnification/demagnification in the wave-optics limit (λ_(GW) ∼ R_(Sch)^(lens) ), which is true for MACHOs. In this talk, we will discuss how the search of lensing signature in GW events observed by LIGO-Virgo can be used to put better constraints on f_DM