A recent "firewall" proposal claims to have settled the black hole information paradox. It suggests that an infalling observer is expected to encounter high-energy quanta in a region near the horizon. The fate of the observers or the very existence of the ‘’firewall’’ itself is still up for debate. Leaving those aside, we are interested in understanding observational signatures of the ‘’firewall’’ at the classical level. With this motivation, we consider a reflective ‘’firewall’’ just outside the event horizon of a Kerr black hole. I will discuss the results of our model and imprint of the ‘’firewall’’ leaves on the emission-line profile of a radiating Keplerian disk. The optical appearance of the black hole-accretion disk system will also be discussed in this context. 

The Cryogenic Underground Observatory for Rare Events (CUORE), hosted at the Laboratori Nazionali del Gran Sasso in Italy, is the first one-tonne scale cryogenic experiment searching for neutrinoless double-beta (0νββ) decay of 130Te. The discovery of this process would demonstrate that lepton number is not a symmetry of nature and that neutrinos are massive Majorana particles. The CUORE experiment has also the potential for the search for rare events and/or for physics beyond the Standard Model other than the 0νββ decay. CUORE is currently in stable operating mode, an exposure of more than 1 tonne∙yr has been achieved and the data taking is currently underway to collect 5 years of run time. In this talk, the current results of CUORE's main analyses will be presented, as well as a review of the detector performance and the analysis techniques. The seminar conclusion will provide an insight on the future perspectives of 0vββ decay searches utilising cryogenic calorimeters, mainly the CUPID experiment.

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