QG2 - Quantum Gravity Phenomenology |
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Speaker |
Bianchi, Eugenio |
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Coauthors |
Gupta, Anuradha; Haggard, Hal; Sathyaprakash, B. S. |
| Talk Title |
Bekenstein-Hawking entropy and the spin of primordial black holes |
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Abstract |
I discuss the phenomenological implications of a prediction shared by all current approaches to quantum gravity: the Bekenstein-Hawking entropy formula. I show that this formula defines a microcanonical ensemble for the spin of black holes. In this ensemble, most of the configurations have small spin as higher spins correspond to a smaller entropy. The ensemble describes primordial black holes formed in the early universe where no orbital mechanism selects a specific spin. The prediction is that primordial black holes have spins peaked at 0, and first-generation primordial mergers have spin peaked at 0.69. I present a preliminary statistical analysis of this prediction, together with a comparison to current astrophysical models of spin alignment, for the best-measured spin parameters through GWs of all the six binary black hole mergers discovered by aLIGO and AdV detectors so far. The imminent transition from single gravitational-wave events to population analyses could provide the first experimental test of the Bekenstein-Hawking entropy. |
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