Gravitational waves (GWs) were recently detected for the first time. This revolutionary
discovery opens a new way of learning about particle physics through GWs from first-order …

Gravitational waves are a unique probe of the early Universe, as the Universe is transparent
to gravitational radiation right back to the end of inflation. This review summarizes detection …

The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA)
collaborations have measured a low-frequency common signal in the combination of their …

Pulsar timing arrays offer a probe of the low-frequency gravitational wave spectrum (1–100
nHz), which is intimately connected to a number of markers that can uniquely trace the …

A bstract In recent years, several pulsar timing array collaborations have reported first hints
for a stochastic gravitational wave background at nano-Hertz frequencies. Here we …

We perform a Bayesian analysis of NANOGrav 15-yr and IPTA DR2 pulsar timing residuals
and show that the recently detected stochastic gravitational-wave background is compatible …

We present the results of a search for continuous gravitational wave signals (CGWs) in the
second data release (DR2) of the European Pulsar Timing Array (EPTA) Collaboration. The …

Gravitational waves from a first-order cosmological phase transition, at temperatures at the
MeV-scale, would arguably be the most exciting explanation of the common red spectrum …

We estimate the gravitational wave spectra generated in strongly supercooled phase
transitions by bubble collisions and fluid motion. We derive analytically in the thin-wall …

We compute the gravitational wave (GW) spectrum sourced by the sound waves produced
during a first-order phase transition in the radiation-dominated epoch. The correlator of the …