Joint cosmology seminar at Tufts:
Tuesday, September 13, 2016, 2:30 pm
574 Boston Ave, Room 316
Refreshments at 2:00 outside room 304
Special Seminar: Evaluating the Gravitational Path Sum in Causal Set Quantum Gravity
The functional integral for gravity poses numerous challenges, one of which is simply deciding the nature of the set of spacetime histories over which one should sum. I will propose an answer to this question in terms of a natural discretization of gravity, which is based on causal structure and the imposition of a finite number of degrees of freedom in a compact region of spacetime. Given a recently discovered form for an action functional on such histories, I begin a numerical exploration of some features of the resulting functional integral, including a characterization of the phase space of the analytically continued sum.