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Quantum Gravity in Species Regime
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A large number of particle species allows to formulate quantum gravity in a special double-scaling limit, the species limit. In this regime, quantum gravitational amplitudes simplify substantially. An infinite set of perturbative corrections, that usually blur the picture, vanishes, whereas the collective and non-perturbative effects can be cleanly extracted. Such are the effects that control physics of black holes and of de Sitter and their entanglement curves. In string theory example, we show that the entropy of open strings matches the Gibbons-Hawking entropy of a would-be de Sitter state at the point of saturation of the species bound. This shows, from yet another angle, why quantum gravity/string theory cannot tolerate a de Sitter vacuum. Finally, we discuss various observational implications.
Forward citations
Cited by 3 Pith papers
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Black Hole Memory Burden and its Signatures in Gravitational Waves from Mergers
Swift memory burden shifts black-hole quasinormal-mode frequencies by an amount set by the memory-load parameter μ and critical exponent p, with μ able to exceed the progenitor's information content.
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The fast, the slow and the merging: probes of evaporating memory burdened PBHs
Diffuse gamma-ray and neutrino data, plus CMB ionization limits, constrain the memory-burden parameters k, q, and delta for primordial black holes and narrow viable dark matter masses to a broad but testable window.
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Micro Black Hole Dark Matter
Micro black holes could survive as dark matter down to 10^{-5} Planck masses if extra dimensions or many species strengthen the memory-burden suppression of their evaporation.
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