We revisit a question asked by Dyson:“Is a graviton detectable?” We demonstrate that in
both Dyson's original sense and in a more modern measurement-theoretic sense, it is …

In the post-LIGO era, there has been a lot of focus on primordial black holes (PBHs) heavier
than∼ 10 15 g as potential dark matter (DM) candidates. We point out that the branch of the …

High-frequency gravitational waves (HFGWs) are predicted in various exotic scenarios
involving both cosmological and astrophysical sources. These elusive signals have recently …

High frequency gravitational waves can be detected by observing the frequency modulation
they impart on photons. We discuss fundamental limitations to this method related to the fact …

A bstract We explore the possibility of embedding thermal leptogenesis within a first-order
phase transition (FOPT) such that RHNs remain massless until a FOPT arises. Their sudden …

We investigate the stochastic gravitational wave (GW) spectrum resulting from graviton
bremsstrahlung during inflationary reheating. We focus on an inflaton ϕ oscillating around a …

A bstract In the presence of electromagnetic fields, both axions and gravitational waves
(GWs) induce oscillating magnetic fields: a potentially detectable fingerprint of their …

High-frequency gravitational waves (HFGWs) carry a wealth of information on the early
Universe with a tiny comoving horizon and astronomical objects of small scale but with …

This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom
Interferometry Workshop hosted by CERN. The workshop brought together experts from …

The gravitational wave (GW) spectrum at frequencies above a kHz is a largely unexplored
frontier. We show that detectors with sensitivity to single-phonon excitations in crystal targets …