Cosmic strings are predicted by various well-motivated models in high-energy particle physics and are potential sources of a gravitational wave background (GWB) detectable by LISA. Predicting their GWB relies on three key ingredients: the dynamics of the string network, the GW emission from loops, and the cosmic history of the Universe. Each of these components carries theoretical...
In the quest to explore the distant Universe, gravity’s universal nature provides crucial aid, as any clump of matter may act as a giant lens to magnify the radiation emitted by otherwise too-faint objects. Thanks to the gravitational lensing of electromagnetic waves, we have mapped the elusive dark matter, found the furthest galaxies, and even discovered exoplanets.
Gravitational waves...
Gravitational waves emitted from binary black hole mergers exhibit highly distinctive characteristics. When these waves undergo gravitational lensing, the resulting distortions in amplitude and phase can be identified. This phenomenon can thus be leveraged to probe small-scale dark matter structures that are still largely unexplored. In this talk, I will discuss recent advances in this field,...
We study the stochastic gravitational wave background sourced by a network of cosmic superstrings and demonstrate that incorporating higher-mass string species, beyond the fundamental string, is crucial for accurately modeling the resulting gravitational wave spectrum across frequencies ranging from nanohertz to kilohertz.
Using the multi-tension velocity-dependent one-scale model to evolve...
Superconducting cosmic strings are intriguing relics of high-energy physics beyond the Standard Model, with the potential to leave observable imprints in the form of gravitational waves. In this talk, I will present recent progress on the stochastic gravitational wave background generated by chiral superconducting cosmic string networks. For the first time, we incorporate the effects of vector...
I will discuss three topics related to the characterization of the stochastic gravitational-wave background using pulsar timing arrays and astrometry: the potential detection of its kinematic dipole, the prospects for measuring its circular polarization, and a novel method for identifying the presence of scalar polarization.
