MG15 - Talk detail

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Abstract

In a spin-network basis state, nodes of the graph describe un-entangled quantum regions of space, quantum polyhedra. In this talk, I discuss how entanglement between intertwiner degrees of freedom enforces gluing conditions for neighboring quantum polyhedra. In particular, I introduce Bell-network states, entangled states defined via squeezed vacuum techniques. I present an analysis of correlations of quantum polyhedra in a dipole, a pentagram, and a generic graph. Finally, I show that vector geometries, structures with neighboring polyhedra having adjacent faces glued back-to-back, arise from Bell-network states. The results presented show clearly the role that entanglement plays in the gluing of neighboring quantum regions of space.

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Session

Accepted

Yes

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Time

Talk

Title

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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