The first generation of stars, often called Population III (or Pop III), form from metal-free
primordial gas at redshifts z∼ 30 and below. They dominate the cosmic star-formation …

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 …

The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency
gravitational-wave background (GWB). While many physical processes can source such low …

Abstract The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders
about the fundamental theory of nature at play in the extreme gravity regime, where the …

Spectroscopy with the James Webb Space Telescope has opened the possibility of
identifying moderate-luminosity active galactic nuclei (AGNs) in the early Universe, at and …

We establish a generic, fully relativistic formalism to study gravitational-wave emission by
extreme-mass-ratio systems in spherically symmetric, nonvacuum black hole spacetimes …

In the recent years, primordial black holes (PBHs) have emerged as one of the most
interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could …

Abstract The James Webb Space Telescope is revealing a new population of dust-reddened
broad-line active galactic nuclei (AGN) at redshifts z≳ 5. Here we present deep …

We produce gravitational waveforms for nonspinning compact binaries undergoing a
quasicircular inspiral. Our approach is based on a two-timescale expansion of the Einstein …

Previous works have argued that future gravitational-wave detectors will be able to probe
the properties of astrophysical environments where binaries coalesce, including accretion …