Scientific Calendar Event

Starts 22 Feb 2024 16:00
Ends 22 Feb 2024 17:00
Central European Time
Luigi Stasi seminar room and via Zoom

Unstable domain wall (DW) networks in the early universe can emit a large amount of gravitational waves (GW) before annihilating.
In the context of the recent GW signal reported by Pulsar Timing Arrays (PTA) collaborations, I will explore them as a possible interpretation.
Next, I will address a crucial question: do unstable Domain Wall networks also lead to significant production of Primordial Black Holes (PBH)? I will then present two main consequences. Firstly, I will assess the compatibility of the DW interpretation of the PTA signal with observational constraints on PBHs. Secondly, I will consider the possibility that Dark Matter can be entirely in the form of asteroid-mass PBHs, resulting from the DW collapse. In this case, I will demonstrate that observable GW signals should be detectable at interferometers (such as LIGO-Virgo-KAGRA and future instruments like LISA and Einstein Telescope).

To join via Zoom:

Meeting ID: 922 5327 1346

Passcode: 170232