Description
Chair: Sukanta Bose
Gravitational waves could be gravitationally lensed just like light. Strong lensing makes gravitational waves appear as repeated events with different amplitudes within our detectors. We will investigate recent forecasts for observed lensed event rates, including sub-threshold searches. We will also discuss a pressing issue related to the current lensed event searches: the rising probability...
The science case for a broad program of gravitational wave (GW) detection across all frequency bands is exceptionally strong. At present, there is a dearth of coverage by existing and proposed searches in the GW frequency band lying between the peak sensitivities of PTAs and LISA, roughly 0.1-100 microhertz. In this talk, I will outline a conceptual mission proposal to access this band. I will...
The future of Gravitational Waves (GWs) is bright. LIGO and Virgo have detected more than 70 signals from black hole and/or neutron star mergers. All measured signals come in-band at around 30 Hz as suspension control noise, fueled by many cross couplings between angular and translational degrees of freedom, is dominant below 30 Hz. It is impossible to know, but exciting to imagine what...
Gravitational-wave detectors are very sensitive instruments that suffer from a huge number of noises. If we aim to observe gravitational waves with Earth-based detectors, we need to take care of every source that can prevent the observation.
Seismic noise poses a huge challenge to the sensitivity in the the low frequency band and it is tackled with suspensions and active controls. The low...
Seismic noise, the related gravitational gradient noise (Newtonian noise) and the thermal noise of the suspension last stage and of the test masses determine the sensitivity of current gravitational-wave detectors at low frequencies. Seismic and Newtonian noises can be mitigated by installing the detectors under the ground, while the thermal noise can be reduced by cryogenically cooling down...
Gravitational waves excite quadrupolar vibrations of elastic bodies. Monitoring these vibrations was one of the first concepts proposed for the detection of gravitational waves by Joseph Weber. At laboratory scale, these experiments became known as resonant-bar detectors, which form an important part of the history of GW detection. Due to the dimensions of these bars, the targeted signal...
Strong gravitational lensing of gravitational waves can produce duplicate signals separated in time with different amplitudes. We consider the case in which strong lensing produces identifiable gravitational wave events and weaker sub-threshold signals hidden in the noise background. We present a search method for the sub-threshold signals using targeted template banks targeting specific...
