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VERSION:2.0
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SUMMARY:Shadow of a Black Hole in Loop Quantum Gravity and its super-radia
 nce property
DTSTART:20220630T143000Z
DTEND:20220630T163000Z
DTSTAMP:20260916T121456Z
UID:36d604f1-4b45-4214-a21e-ea4434d97760
SEQUENCE:3
CREATED:20220628T141329Z
DESCRIPTION:Abstract:We will discuss the shadow calculation of the loop qu
 antum gravity motivated regular black hole recently proposed by Ashtekar\,
  Olmedo and Singh (AOS black hole hereafter). In the process\, we also con
 struct the rotating loop quantum gravity inspired solution of the original
 ly proposed static spherically symmetric AOS black hole by applying the mo
 dified Newman-Janis algorithm. We study the quantum effects on the shadows
  of both the non-rotating and rotating loop quantum black hole solutions. 
 It is observed that the general shape of the shadow for nonrotating AOS bl
 ack hole is circular in shape as is expected for its classical counterpart
  too\, but the presence of loop quantum gravity inspired modification cont
 racts the shadow radius and the effect reduces with the increase in the ma
 ss of the black hole. On a similar note\, in the rotating situation\, we f
 ind contraction in shadow radius due to quantum effects and the tapered na
 ture of the shadow as expected from the classical Kerr case. However\, ins
 tead of the symmetrical contraction\, like non-rotating one\, we found mor
 e contraction on one side relative to the other when we compare our result
  with the shadow of the Kerr black hole. We finally studied super-radiance
  in rotating AOS background and observed that the super-radiance condition
  for massless scalar field is identical to that of the Kerr case with the 
 rotation of the BH being more compared to Kerr in the low mass regime. Wit
 h an increase in mass of the rotating AOS black hole\, the difference from
  Kerr starts to become insignificant. We also perform the calculation of t
 he super-radiance amplification factor using Teukolsky formalism in the AO
 S background and present a comparative study of the amplification factors 
 of the AOS and Kerr black holes with respect to changing mass and spin of 
 the holes.
LAST-MODIFIED:20220628T142555Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/shadow-of-a-black-hole-in-
 loop-quantum-gravity-and-its-super-radiance-property/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="vjlql"></p><p data-block-k
 ey="6hua5">Abstract:</p><p data-block-key="aq7p">We will discuss the shado
 w calculation of the loop quantum gravity motivated regular black hole rec
 ently proposed by Ashtekar\, Olmedo and Singh (AOS black hole hereafter). 
 In the process\, we also construct the rotating loop quantum gravity inspi
 red solution of the originally proposed static spherically symmetric AOS b
 lack hole by applying the modified Newman-Janis algorithm. We study the qu
 antum effects on the shadows of both the non-rotating and rotating loop qu
 antum black hole solutions. It is observed that the general shape of the s
 hadow for nonrotating AOS black hole is circular in shape as is expected f
 or its classical counterpart too\, but the presence of loop quantum gravit
 y inspired modification contracts the shadow radius and the effect reduces
  with the increase in the mass of the black hole. On a similar note\, in t
 he rotating situation\, we find contraction in shadow radius due to quantu
 m effects and the tapered nature of the shadow as expected from the classi
 cal Kerr case. However\, instead of the symmetrical contraction\, like non
 -rotating one\, we found more contraction on one side relative to the othe
 r when we compare our result with the shadow of the Kerr black hole. We fi
 nally studied super-radiance in rotating AOS background and observed that 
 the super-radiance condition for massless scalar field is identical to tha
 t of the Kerr case with the rotation of the BH being more compared to Kerr
  in the low mass regime. With an increase in mass of the rotating AOS blac
 k hole\, the difference from Kerr starts to become insignificant. We also 
 perform the calculation of the super-radiance amplification factor using T
 eukolsky formalism in the AOS background and present a comparative study o
 f the amplification factors of the AOS and Kerr black holes with respect t
 o changing mass and spin of the holes.</p>
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