Quantum gravity
Gravity describes a changing spacetime. Quantum physics describes matter and its possibilities. How should they work together in a single physical account?
Quantum physics
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Quantum measurement problem
A single photon gives a left or right detector click. Quantum theory predicts the odds, but treating the detectors quantum mechanically produces a superposition of possible records. How should that state account for a definite result?
Black hole information problem
If a black hole evaporates, how is the information about what fell into it represented in what comes out? The answer must reconcile quantum evolution with gravitational calculations.
Cuprate pairing mechanism
What microscopic interaction produces superconducting electron pairs across the cuprate phase diagram?
Hole-doped cuprate pseudogap
Why do hole-doped cuprates lose low-energy electronic states before superconductivity appears?
Charge order in kagome superconductors
Why does charge order break symmetry differently across the AV3Sb5 kagome superconductor family?
Non-Abelian anyons in the 5/2 fractional quantum Hall state
Do the excitations of the 5/2 fractional quantum Hall state exhibit non-Abelian exchange statistics?
Many-body localization in two dimensions
Can an isolated two-dimensional disordered interacting system avoid thermalization indefinitely?
Kitaev spin liquid in α-RuCl3
Is the field-induced state of α-RuCl3 a Kitaev spin liquid with fractional excitations?
Bilayer nickelate pairing mechanism
Nickel-oxide bilayers superconduct under high pressure and in suitably prepared ambient-pressure films. What interaction binds the electron pairs, and can one quantitative account explain the measured gaps and material dependence?
Solid-state nuclear clock accuracy
Laser-controlled clocks can already use thorium-229 nuclei inside crystals. Can their environmental shifts be measured and controlled well enough to establish a complete fractional-frequency uncertainty near 10^-18?