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 …

It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

Pulsar timing arrays (PTAs) have reported evidence for a stochastic gravitational wave (GW)
background at nanohertz frequencies, possibly originating in the early Universe. We show …

We discuss the interpretation of the detected signal by pulsar timing array (PTA)
observations as a gravitational wave background of cosmological origin. We combine …

Abstract The Einstein Telescope (ET), a proposed European ground-based gravitational-
wave detector of third-generation, is an evolution of second-generation detectors such as …

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 …

Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark
discovery, potentially providing a significant clue to some of our most basic, big-picture …

We present a set of tools to assess the capabilities of LISA to detect and reconstruct the
spectral shape and amplitude of a stochastic gravitational wave background (SGWB). We …

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 …

Kination denotes an era in the cosmological history corresponding to an equation of state
$\omega=+ 1$ such that the total energy density of the universe redshifts as the sixth inverse …