Quasars powered by supermassive black holes of 10^10 solar masses already existed at z~6-7, when the Universe was less than 1 Gyr old. Recently, the James Webb Space Telescope has started to detect supermassive black holes of 10^7 at even z~10. To reach this mass in such a short time, supermassive black holes should have started as seed black holes of 10^2-10^5 solar masses at z > 15. Such...
I will discuss the current LISA Cosmology Working Group effort to initiate the first template-based analysis for Stochastic Gravitational Wave Background (SGWB) signals.
After introducing a databank to describe well-motivated signals from inflation, prototype their template-based searches, and forecast the constraints on the model parameters, I will examine how the signal reconstructions shed...
Ultra-light dark matter is an exciting alternative to the standard cold dark matter paradigm: it reproduces its large-scale (cosmological) predictions while solving most of its potential tension with small-scale (galactic) observations, like the "cusp-core" and "missing satellites" problems. If dark matter is made of some new ultra-light boson, dense structures are expected to form at the...
Observing sources of, almost monochromatic, continuous gravitational waves (CWs) represents one of the next major goals in gravitational-wave astronomy. The primary source would be rapidly-rotating neutron stars (NSs) in our Galaxy, either isolated or in binary systems, which are characterized by a time-varying quadrupole deformation due to an asymmetry in their mass distribution. Due to the...
The talk reviews the goals and current status of the challenge to develop accurate models of gravitational wave signals, which can be used for matched-filter based data analysis in current and future gravitational wave detectors. I will highlight the main approaches to this problem, and discuss in some more detail the phenomenological waveforms program, which has produced waveforms that have...
