We adapt a method, originally developed for continuous gravitational-wave searches, to directly detect dark photon dark matter. The method involves optimally choosing the analysis coherence time as a function of the frequency band analyzed, such that all of the signal's power will be confined to one frequency bin during the observation time. We describe the dark photon signal in detail, and...
Electromagnetic detectors (and generators) of gravitational waves have been considered since the early 70s, besides of the mechanical detectors and laser interferometers. The so-called Gertsenshtein effect describes the generation of gravitational waves when light passes through some constant magnetic field. However, it is the reverse phenomena – electromagnetic waves arising when incoming...
Advanced gravitational wave detectors operate under extreme conditions of temperature and/or radiation. We will discuss both the advantages and challenges of employing custom chips for these systems. Specific challenges are highlighted for the Einstein Telescope and LISA design cases with the current techniques and work done to ensure reliable performance in each of the environments.
As a way of an introduction, I will briefly discuss some recent work on models of the early universe in which the abundance of dark matter is set by a period of late-time thermal inflation. Such scenarios terminate in very strong phase transitions which can be detected by upcoming gravitational wave interferometers.
We use of the 3+1 formalism of numerical relativity to investigate the robustness of Starobinsky and Higgs inflation to inhomogeneous initial conditions dominated by either scalar field gradients or by the kinetic energy density. Strong Sub-Hubble fluctuations generically lead to inflation after a dynamical phase driven by an oscillatory equation of state. On the other hand, Super-Hubble...
