BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Black Holes and Dark Matter DTSTART:20220505T143000Z DTEND:20220505T160000Z DTSTAMP:20260730T182000Z UID:20d9b53b-b9a3-46ca-be99-c70407f7e459 SEQUENCE:1 CREATED:20220502T143242Z DESCRIPTION: Abstract:The discovery of gravitational wave signals from mer ger events of massive binary-black-hole (BBH) systems have prompted a rene wed debate in the scientific community about the interplay between Black H ole phenomenology and Dark Matter searches. On the one hand\, Black Holes of primordial origin (PBHs) may have formed in the early Universe and coul d constitute a significant portion of the elusive dark matter that\, accor ding to standard cosmology\, makes up the majority of the matter content i n the universe. On the other hand\, peculiar classes of Black Holes can be studied as "\;portals"\; to Dark Matter detection in the Gravitat ional Wave channel\, due to the large density of DM that is expected to be present around them. In the first part of the talk\, I will review the mo st promising multi-messenger avenues towards detection of PBHs. I will fir st focus on the radio/X-ray band\, and present the prospects of discovery for both a hypothetical PBH population and the guaranteed population of as trophysical isolated black holes in our Galaxy\, based on the broad-band e mission from the interstellar gas that is being accreted onto them. Then\, I will turn my attention to the gravitational wave domain\, and discuss t he merger rate of black-hole binaries. I will present a detailed evaluatio n of the expected rate from a generic (subdominant) component of PBHs\, an d analyze the role of future observation at high redshift to identify a pr imordial component on top of the rate associated to astrophysical BHs. In the final part of my talk\, I will turn my attention to the impact of Dark Matter overdensities around Intermediate-Mass Black Holes\, and on their impact on the gravitational waveform emitted in presence of an Intermediat e-Mass-Ratio inspiral. I will demonstrate that the dephasing effect induce d by the presence of the DM is observable in this channel\, and the proper ties of the DM overdensity can be measured by the upcoming LISA observator y. LAST-MODIFIED:20220502T143242Z LOCATION:Sala de Seminários do DF\, Pavilhão de Física\, 2º piso URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/black-holes-and-dark-matte r/ X-ALT-DESC;FMTTYPE=text/html:

Abstract:
The discovery of gravitational wave signals from merger events of massive bina ry-black-hole (BBH) systems have prompted a renewed debate in the scientif ic community about the interplay between Black Hole phenomenology and Dark Matter searches. On the one hand\, Black Holes of primordial origin (PBHs ) may have formed in the early Universe and could constitute a significant portion of the elusive dark matter that\, according to standard cosmology \, makes up the majority of the matter content in the universe. On the oth er hand\, peculiar classes of Black Holes can be studied as "\;portals "\; to Dark Matter detection in the Gravitational Wave channel\, due t o the large density of DM that is expected to be present around them. In t he first part of the talk\, I will review the most promising multi-messeng er avenues towards detection of PBHs. I will first focus on the radio/X-ra y band\, and present the prospects of discovery for both a hypothetical PB H population and the guaranteed population of astrophysical isolated black holes in our Galaxy\, based on the broad-band emission from the interstel lar gas that is being accreted onto them. Then\, I will turn my attention to the gravitational wave domain\, and discuss the merger rate of black-ho le binaries. I will present a detailed evaluation of the expected rate fro m a generic (subdominant) component of PBHs\, and analyze the role of futu re observation at high redshift to identify a primordial component on top of the rate associated to astrophysical BHs. In the final part of my talk\ , I will turn my attention to the impact of Dark Matter overdensities arou nd Intermediate-Mass Black Holes\, and on their impact on the gravitationa l waveform emitted in presence of an Intermediate-Mass-Ratio inspiral. I w ill demonstrate that the dephasing effect induced by the presence of the D M is observable in this channel\, and the properties of the DM overdensity can be measured by the upcoming LISA observatory.

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