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## Joint Theory Seminar David Rideout

Recent Papers of David Rideout

Description: Joint Theory Seminar

Speaker: David Rideout

Title: Evaluating the Gravitational Path Sum in Causal Set Quantum Gravity

Host: Steve Carlip

Room: 432

Abstract: 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 will present a numerical exploration of some features of the resulting functional integral, including a characterization of the phase space of the analytically continued sum. The results point to evidence that the dynamically preferred spacetime histories have a two dimensional character as one approaches the Planck scale.Date: Monday, February 13, 2017 Time: 1:30pm-2:30pm Duration: 60 minutes Access: Public Created by: High-Energy Seminars Updated: Friday, January 20, 2017 3:22pm Send Reminder: Yes - 3 days 4 hours before event

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