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Quantum Black Holes: Conformal Anomaly Effects, Echoes in Gravitational Waves

Abedi, Jahed | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50841 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Arfaei, Hessamaddin; Afshordi, Niayesh
  7. Abstract:
  8. In this thesis by studying the extreme physical conditions near black hole horizons and singularity, we attack intriguing problems in the exciting era of quantum black holes and gravitational wave astronomy. We considered the backreaction of the energy due to quantum fluctuations of the background fields for a Schwarzschild black hole, in semi-classical gravity. We have shown that it results in modification of the horizon and also formation of an inner horizon. The process of the collapse of a thin shell stops before formation of the singularity. After the collapse stops the reverse process takes place. We also demonstrate the existence of a cold remnant for the black hole. We generalized the methode to other black holes and find corrections to thermodynamical quantities of quantum modified black holes. We search for observational signatures of echoes in the gravitational wave data released by LIGO, following the three black hole merger events GW150914, GW151226, and LVT151012.In particular, we look for repeating damped echoes with time-delays of 8M logM (+spin corrections, in Planck units), corresponding to Planckscale departures from GR near their respective horizons. We report a first tentative evidence at 2:5 significance (or p-value of 0.01) of signatures of Planck-scale structure near the event horizons. We found possible empirical evidence for alternatives to classical black holes, such as in firewall or fuzzball paradigms
  9. Keywords:
  10. Event Horizon ; Singularity ; Planck Mass ; Quantum Black Holes ; Gravitational Waves

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