We use holography as a tool to explore all-order in velocity gradients relativistic hydrodynamics. We demonstrate the link between causality and instability of the theory.
The (degenerate) geometry of event horizons is linked to Carrollian fluids. We investigate the behaviour of event horizons via a perturbative coupling to a massless scalar field, making connections to Carrollian hydrodynamics with a driving source, and discuss the fluid equilibration in tandem with the horizon’s relaxation to equilibrium. We observe that after the perturbation dies off, the...
The nature of the compact objects within the supposed 3-5M⊙ “lower mass gap” remains uncertain. Observations of GW190814 and GW230529 highlight the challenges gravitational waves face in distinguishing neutron stars from black holes. Interpreting these systems is especially difficult because classifications depend simultaneously on measurement noise, compact binary population models, and...
In this era of gravitational waves from blackhole and neutron star mergers, GW data is being collected at an amazing pace. There is a possibility of GWs of BH mergers scattering from wormholes and/or other exotic compact objects (ECOs), if they exist. Specialized groups are searching for wormhole signatures. We share the results of our study of scalar field perturbations and quasi-normal modes...
