In a Universe with nearly-Gaussian initial curvature perturbations, the abundance of primordial black holes can be derived from the curvature power spectrum. When the latter is enhanced within a narrow range around a characteristic scale, the resulting mass function has a single distinct peak, corresponding to Schwarzschild radii set by the horizon entry time of that scale. In contrast, we...
I will discuss how the new cosmological Baryon Acoustic Oscillations (BAO) measurements by the DESI
collaboration have changed the status of the so-called Hubble tension, i.e. the mismatch between global
cosmological measurements and local measurements of H0 (by the SH0ES Collaboration). In particular, in
models with Dark Radiation the tension decreases to a moderate level, around 2 sigma and...
The memory burden effect describes how the information load carried by a system contributes to its stabilization. This phenomenon is particularly significant in systems with a high capacity for information storage, such as black holes and other entities with maximal microstate degeneracy, commonly. The effect has several key implications. Notably, it slows the further decay of a black...
