Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of
cosmological focus: to probe the expansion rate of the universe, and to understand …

We review the particle theory origin of inflation and curvaton mechanisms for generating
large scale structures and the observed temperature anisotropy in the cosmic microwave …

Recently, pulsar timing array (PTA) experiments have provided compelling evidence for the
existence of the nanohertz stochastic gravitational wave background (SGWB). In this work …

Cosmic string networks offer one of the best prospects for detection of cosmological
gravitational waves (GWs). The combined incoherent GW emission of a large number of …

We examine which information on the early cosmological history can be extracted from the
potential measurement by third-generation gravitational-wave observatories of a stochastic …

Using recent simulation results, we provide the mass and speed spectrum of cosmic string
loops. This is the quantity of primary interest for many phenomenological signatures of …

We review several cosmological backgrounds of gravitational waves accessible to direct-
detection experiments, with a special emphasis on those backgrounds due to first-order …

Using a new parallel computing technique, we have run the largest cosmic string
simulations ever performed. Our results confirm the existence of a long transient period …

If cosmic strings are formed in the early universe, their associated loops emit gravitational
waves during the whole cosmic history and contribute to the stochastic gravitational wave …

Cosmic strings, if they exist, source nonlinear and non-Gaussian perturbations all the way
back to the time of equal matter and radiation (and earlier). Here, we compute the mass …