Young@INFN 2025: 2nd event - "Gravitational waves"

by Lorenzo Piccari (Sapienza, INFN), Romeo Felice Rosato

Thursday 10 Apr 2025, 16:30 → 18:30 Europe/Rome

Sala Direzione INFN (Dipartimento di Fisica - Edi. Marconi)

1st speaker: Romeo Felice Rosato
Title: "Greybody factors as robust gravitational observables"

Abstract: "The quasinormal mode spectrum plays a crucial role in modeling post-merger ringdown signals in binary coalescences, encompassing both black holes and ultracompact horizonless objects. However, quasinormal modes suffer of many ambiguities. Motivated by a recently discovered connection between greybody factors and post-merger black hole signals, we study the robustness of greybody factors as gravitational observables for ultracompact horizonless objects, furnishing a complementary approach to quasinormal modes, unveiling non-trivial properties of those hypothetical objects."

2nd speaker: Lorenzo Piccari
Title: "What ten years of Gravitational waves looks like"

Abstract: "The first detection of a gravitational-wave signal emitted by the coalescenceo a compact binary system was made by LIGO detectors on September 14, 2015. The event, associated with a binary black hole merger, marked the beginning of gravitational-wave (GW) astronomy, offering a new way to probe our Universe. Since then, during the first three Observing Runs of the LIGO-Virgo-KAGRA (LVK) Collaboration, Advanced LIGO and Advanced Virgo uncovered 90 GW signals. Additionally, the LVK has released over 200 low-latency public alerts for new GW detections during the ongoing Fourth Observing Run. In this talk, I will provide an overview of the most relevant observational results obtained so far. Furthermore, I will discuss some of the observational goals that still need to be achieved, particularly the search for subsolar-mass binaries, which is currently one of the main focuses of my research activity."