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 analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A
good fit is found for a string tension G μ∼ 10-12–10-11 and a string intercommutation …

Classically conformal Standard Model extensions predict an intriguing thermal history of the
early Universe. In contrast to the common paradigm, the onset of the electroweak phase …

In recent years, methods for Bayesian inference have been widely used in many different
problems in physics where detection and characterization are necessary. Data analysis in …

The Laser Interferometer Space Antenna (LISA) will detect gravitational waves (GWs)
emitted by massive black hole binaries (MBHBs) in the low-frequency (∼ mHz) band. Low …

Every signal propagating through the universe is diffracted by the gravitational fields of
intervening objects, aka gravitational lenses. Diffraction is most efficient when caused by …

We discuss a new source of gravitational waves (GWs) from first-order phase transitions.
The collisions of bubbles of the new phase can efficiently produce particles that couple to …

In light of NANOGrav data, we provide for the first time possible observational signatures of
Superstring theory. First, we work with inflection-point inflationary potentials naturally …

We compute the expected response of detector arms of gravitational wave observatories to
polymerized gravitational waves. The mathematical and theoretical features of these waves …

Gravitational waves might help resolve the tension between early and late Universe
measurements of the Hubble constant, and this possibility can be enhanced with a …