The overarching concern of our research program is the form and character of formulations of quantum theory general enough both to pose quantum questions in space and time (as opposed to merely at a moment of time), and to encompass a quantum theory of spacetime — quantum gravity. These issues are explored through applying quantum mechanics to the universe as whole as described by quantum mechanical models of gravity, a field called quantum cosmology, and by studying how quantum mechanics itself can be used to describe closed systems with no external observers.

Publications

• Cosmological dynamics in spin-foam loop quantum cosmology: challenges and prospects [(with P. Singh) Class. Quantum Grav. 34 074001 (2017)]
• The consistent histories approach to loop quantum cosmology [Int. J. Mod. Phys. D25 1642009 (2016)]
• Consistent probabilities in loop quantum cosmology [(with P. Singh) Class. Quantum Grav. 30 205008 (2013)]
• Dynamical eigenfunctions and critical density in loop quantum cosmology [Class. Quantum Grav. 30 035010 (2013)]
• Consistent probabilities in Wheeler-DeWitt quantum cosmology [(with P. Singh) Phys. Rev. D 82 123526-123546 (2010)]
• A Bell inequality analog in quantum measure theory [(with F. Dowker, J. Henson, S. Major, D. Rideout, and R. Sorkin) J. Phys. A: Math. Theor. 40 501-523 (2007)]
• Generalized quantum theory of recollapsing homogeneous cosmologies [(with J.B. Hartle) Phys. Rev. D 69 123525-123547 (2004)]
• The geometry of consistency: decohering histories in generalized quantum theory
• Observation of the final boundary condition: extragalactic background radiation and the time symmetry of the universe [Ann. Phys. 251 384-425 (1996)]