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VERSION:2.0
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SUMMARY:Spontaneous Hawking radiation in a sonic black hole
DTSTART:20250430T160000Z
DTEND:20250430T170000Z
DTSTAMP:20260905T201521Z
UID:1083deae-b8c0-438c-9fd7-c502d74cde19
SEQUENCE:2
CREATED:20250424T084020Z
DESCRIPTION:Stephen Hawking predicted that black holes should radiate\, bu
 t observation of this Hawking radiation from a real astrophysical black ho
 le seems unlikely\, since the predicted temperature of the radiation is ex
 tremely low. Bill Unruh asserted that Hawking radiation might be observabl
 e in a sonic black hole\, in which sound plays the role of light. We make 
 such an observation in a sonic black hole formed from a Bose-Einstein cond
 ensate. We confirm that the Hawking radiation is spontaneous\, thermal\, a
 nd stationary. Furthermore\, we follow the time evolution of the Hawking r
 adiation\, and compare and contrast it with the predictions for real black
  holes. We observe the ramp up of the Hawking radiation\, similar to a rea
 l black hole. The spontaneous Hawking radiation ends\, and stimulated Hawk
 ing radiation begins\, when the sonic black hole forms an inner horizon in
  addition to the event horizon.
LAST-MODIFIED:20250424T084032Z
LOCATION:Anfiteatro PA1 (Piso -1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/spontaneous-hawking-radiat
 ion-in-a-sonic-black-hole/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="57hm0">Stephen Hawking pre
 dicted that black holes should radiate\, but observation of this Hawking r
 adiation from a real astrophysical black hole seems unlikely\, since the p
 redicted temperature of the radiation is extremely low. Bill Unruh asserte
 d that Hawking radiation might be observable in a sonic black hole\, in wh
 ich sound plays the role of light.<br/><br/> We make such an observation i
 n a sonic black hole formed from a Bose-Einstein condensate. We confirm th
 at the Hawking radiation is spontaneous\, thermal\, and stationary. Furthe
 rmore\, we follow the time evolution of the Hawking radiation\, and compar
 e and contrast it with the predictions for real black holes. We observe th
 e ramp up of the Hawking radiation\, similar to a real black hole.<br/><br
 /> The spontaneous Hawking radiation ends\, and stimulated Hawking radiati
 on begins\, when the sonic black hole forms an inner horizon in addition t
 o the event horizon.</p>
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