Conveners
AIP: Relativity and Gravitation: ASGRG 1
- Karelle Siellez (University of California Santa Cruz)
AIP: Relativity and Gravitation: ASGRG 2
- Krzysztof Bolejko
Future interferometric gravitational-wave detectors are predicted to be impacted by low-frequency relative displacement motion between their seismic isolation platforms. We will present the advantages, sensitivity targets and latest prototype developments towards a digitally-enhanced interferometric sensor for measuring this motion.
This talk discusses a rigorous analysis of phasemeter behaviour in the ultra weak-light regime. We explore the fundamental limit in optical power at which heterodyne phase tracking measurements can be reliably performed, Focused on application in space-based interferometry.
This research illustrates a novel method of stabilizing the laser in the LISA mission with respect to two references – the on-board optical cavity, and the inter-spacecraft separations or the arms of the interferometer
We present the characterization of the simultaneous four offset-optical phase-locked loop set up used as part of a Newtonian noise sensor readout, and discuss their performance and limits with respect to the scientific requirements for the experiment.
Designing Hartmann wavefront sensor telescopes for improved sensing of thermal aberrations in large diameter optics inside gravitational wave interferometers.
In this talk, we will present our latest developments of the advanced low-frequency rotational accelerometer that has direct utilization in seismology applications and seismic isolation in gravitation wave detectors.
The gravitational-wave observation of GW200129 hinted at the presence of spin-precession - an important observation for understanding black-hole binary formation. We discuss how this observation may instead be attributed to noise transients in the gravitational-wave detectors.
Black holes, white holes and wormholes can be treated in a unified fashion. Starting from two natural assumptions many of their properties, sometimes in conflict with the usual semiclassical expectations, can be obtained.
Physical black holes are considered to be trapped regions bounded by the apparent horizon. Even though assuming that semi-classical physics is valid and curvature is not diverging there, other things suggest that the apparent horizon is a mildly singular surface.
This talk focuses on work completed in adapting continuous gravitational wave search techniques, currently only sensitive to long lived stable neutron stars, to be suited to detecting young neutron stars with rapidly changing frequency.
Exact solutions to Einstein's field equations are notoriously difficult. In this work we obtain expressions for the metric tensor for the interior of a star, i.e., for static spherically symmetric space-times with positive and monotonically decreasing density and pressure.
In quantum gravity, it is anticipated that there exist "quantum superpositions of spacetime". Here, I develop a framework for constructing such superpositions to analyse a mass-superposed black hole. My results corroborate Bekenstein's conjecture for the mass quantisation of black holes.
