Primordial Black Holes (PBHs) are fascinating astrophysical objects that could provide valuable insights into the early universe, cosmology, and gravitational physics.
The standard formation scenario assumes that PBHs originate from the gravitational collapse of large curvature fluctuations generated during inflation. These same large scalar fluctuations, which can lead to PBH formation...
The physics of Primordial Black Holes has garnered significant interest in recent years, largely due to the numerous detections of gravitational
waves originating from BH binary mergers and the hypothesis that some of
these may be of primordial origin.
We show that in realistic models where primordial black holes are formed due to the collapse of sizeable inflationary perturbations, their...
The detection of gravitational waves (GWs) from binary black hole mergers has opened an exciting new avenue for cosmological research. Because GWs interact very weakly with matter, there is potential to observe primordial GWs among the signals captured by current and future detectors. This provides a unique opportunity to probe the early universe physics. Primordial GWs are typically generated...
Mounting evidence suggests that the semi-classical description of a black hole breaks down at the latest after losing an~$O(1)$ fraction of its mass. As a result, effects such as memory burden can slow down evaporation so that small primordial black holes (PBHs), in particular those in the mass range~$10^{6}\, \text{g}$ to~$10^{9}\, \text{g}$, become viable dark matter candidates. I will...
Although there is substantial observational evidence for an
early period of exponential expansion of the Universe, known as
inflation, followed by a subsequent era of radiation domination, the
intermediate period connecting these two epochs, referred to as
reheating, remains challenging to constrain. In this talk, I will
present the primordial black hole (PBH) reheating scenario,...
Primordial black holes (PBHs) serve as a compelling candidate for dark matter and a potential probe of early universe physics. One promising avenue for constraining their abundance is through the stochastic gravitational wave background (SGWB) induced by primordial curvature perturbations. In this talk, I will present how current and future gravitational wave observatories—including Pulsar...
Primordial black holes (PBHs) are possible sources of a gravitational-wave background (GWB), detectable with LISA and the next observing runs of LIGO--Virgo--KAGRA. In case of a detection, it will be crucial to distinguish the possible sources of this GWB. One possibility is to exploit the duty cycle that quantifies the number of sources present in the time domain signal, which can be very...
