Quarks and nuclear matter
Hadronic structure, magnetic-moment inputs and collective behavior in particle collisions.
7 problemsQuantum foundations
Measurement, gravity, and black holes challenge our account of quantum physics.
Subjects: Quantum physics · Particle physics
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3 problemsQuantum 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?
Quantum gravity
Gravity describes a changing spacetime. Quantum physics describes matter and its possibilities. How should they work together in a single physical account?
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.