BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Bondi-type accretion onto a Kerr black hole in the kinetic regime DTSTART:20251113T143000Z DTEND:20251113T160000Z DTSTAMP:20260517T083918Z UID:53233710-8439-4926-b637-ddbab3c7431c SEQUENCE:2 CREATED:20251111T094124Z DESCRIPTION:We derive an exact solution representing a Bondi-type stationa ry accretion of a kinetic (Vlasov) gas onto the Kerr black hole. The solut ion is exact in the sense that relevant physical quantities\, such as the particle current density or the accretion rates\, are expressed as explici t integrals\, which can be evaluated numerically. We provide an analytic a pproximation which allows us to obtain simple formulas for the mass\, ener gy\, and angular momentum accretion rates. These formulas are used to deri ve characteristic time scales of the black hole mass growth and the associ ated spin-down in two different scenarios: assuming that the ambient energ y density is either constant or decreases on a cosmological scale. LAST-MODIFIED:20251111T094216Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/httpsvideoconf-colibrizoomu sj2379957042/ X-ALT-DESC;FMTTYPE=text/html:

We derive an exact solution representing a Bondi-type stationary accretion of a kinetic (Vlas ov) gas onto the Kerr black hole. The solution is exact in the sense that relevant physical quantities\, such as the particle current density or the accretion rates\, are expressed as explicit integrals\, which can be eval uated numerically.

We provide an analytic approximation which al lows us to obtain simple formulas for the mass\, energy\, and angular mome ntum accretion rates. These formulas are used to derive characteristic tim e scales of the black hole mass growth and the associated spin-down in two different scenarios: assuming that the ambient energy density is either c onstant or decreases on a cosmological scale.

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