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Gravitational Physics

3
Open Unknowns
0
Cross-Domain Bridges
2
Active Hypotheses

Open Unknowns (3)

Unknown Does the island formula (quantum extremal surface prescription) provide a complete resolution of the black hole information paradox in full quantum gravity, or only within the semiclassical approximation where the bulk geometric saddle points are well-defined โ€” and what is the mechanism by which bulk quantum fields reconstruct the interior from boundary data after the Page time? u-black-hole-information-paradox-bulk-reconstruction
Unknown What is the precise mathematical mechanism by which AdS/CFT duality maps quantum gravity in anti-de Sitter space to conformal field theory on its boundary? u-gauge-gravity-duality-mechanism
Unknown How does quantum gravity reduce to general relativity in the semiclassical limit, and what observable corrections to GR does quantum gravity predict? u-quantum-gravity-semiclassical-limit

Active Hypotheses

Hypothesis The nanohertz gravitational wave background detected by pulsar timing arrays is dominated by a stochastic superposition of gravitational waves from supermassive black hole binary inspirals, with a characteristic strain spectrum h_c(f) โˆ f^{-2/3} confirming the circular inspiral origin, and the amplitude encoding the SMBHB merger rate ร— mass function. high
Hypothesis The island formula's quantum extremal surface is the gravitational analog of the decoding threshold in quantum error correction: islands appear precisely when the entanglement wedge reconstruction map transitions from reconstructing exterior to interior operators, providing a quantum-information-theoretic derivation of the Page time as the threshold for interior information recovery. medium

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