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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:20260915T225236Z
UID:1083deae-b8c0-438c-9fd7-c502d74cde19
SEQUENCE:1
CREATED:20250424T084009Z
DESCRIPTION: Stephen Hawking predicted that black holes should radiate\, b
 ut observation of this Hawking radiation from a real astrophysical black h
 ole seems unlikely\, since the predicted temperature of the radiation is e
 xtremely low. Bill Unruh asserted that Hawking radiation might be observab
 le 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 con
 densate. We confirm that the Hawking radiation is spontaneous\, thermal\, 
 and stationary. Furthermore\, we follow the time evolution of the Hawking 
 radiation\, and compare and contrast it with the predictions for real blac
 k holes. We observe the ramp up of the Hawking radiation\, similar to a re
 al black hole. The spontaneous Hawking radiation ends\, and stimulated Haw
 king radiation begins\, when the sonic black hole forms an inner horizon i
 n addition to the event horizon. 
LAST-MODIFIED:20250424T084009Z
LOCATION:Anfiteatro PA1 (Piso -1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/en/events/spontaneous-hawking-radiati
 on-in-a-sonic-black-hole/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="57hm0"> Stephen Hawking pr
 edicted that black holes should radiate\, but observation of this Hawking 
 radiation from a real astrophysical black hole seems unlikely\, since the 
 predicted temperature of the radiation is extremely low. Bill Unruh assert
 ed that Hawking radiation might be observable in a sonic black hole\, in w
 hich sound plays the role of light. <br/><br/>We make such an observation 
 in a sonic black hole formed from a Bose-Einstein condensate. We confirm t
 hat the Hawking radiation is spontaneous\, thermal\, and stationary. Furth
 ermore\, we follow the time evolution of the Hawking radiation\, and compa
 re and contrast it with the predictions for real black holes. We observe t
 he ramp up of the Hawking radiation\, similar to a real black hole.<br/><b
 r/> The spontaneous Hawking radiation ends\, and stimulated Hawking radiat
 ion begins\, when the sonic black hole forms an inner horizon in addition 
 to the event horizon. </p>
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