Physics and Astronomy Colloquium Series
Next Seminar
Thursday, February 16
4:00 PM
Dr. Kassahun Betre
Stanford University
"Spacetime Geometry from Quantum Graphity"
Abstract:
Quantum Graphity has been proposed as one approach towards a theory of Quantum Gravity in which a fully quantum mechanical, background independent system in the high energy gives rise to a low energy state that resembles ordinary spacetime through ensemble averaging. The high energy states of the Quantum Graphity system are random graphs with microscopic degrees of freedom that live on the edges and vertices. With a suitably chosen Hamiltonian, the low energy limit of the system will become a discretized regular lattice. While this program is promising, much work remains to be done to show that low dimensional Riemannian geometric structure and General Relativistic dynamics can result through statistical mechanics.
Two important aspects to this program are: First, further rigorous formulation is required to arrive at the precise way in which geometric notions of the low energy regular lattice are related to the graphs of the high energy system. Second, a suitable Hamiltonian that will give rise to a regular lattice in the low energy limit needs to be determined. In this colloquium, I will give an overview of the program of Quantum Graphity and progress made so far in the field. I will then describe a new approach towards a suitable Hamiltonian that can generate uniform dimensions in the low energy limit.
The Physics and Astronomy Colloquium Series is open to all members of the university. Unless otherwise noted, talks are held on Thursday afternoons at 4:005:20 in Mendocino 1015. Schedule is regularly updated as dates, titles, and abstracts are received. Please check back often. To receive updates about the Colloquium Series, please join our Events Mailing List. For past semesters' series, see our archive. Spring 2017 Semester Schedule February 7, 2017 February 9, 2017 February 14, 2017 February 16, 2017 March 2, 2017 March 30, 2017 April 6, 2017 April 20, 2017 May 4, 2017 May 9, 2017 May 11, 2017
