Skip to main navigation Skip to main content
The University of Southampton
STAG Research Centre

String Theory seminar - Aron Wall Seminar

Time:
13:00 - 14:00
Date:
22 June 2016
Venue:
46/2003 (L/T B)

For more information regarding this seminar, please email Da-Wei Pang at [email protected] .

Event details

Negative energy and the focussing of light rays

In any quantum field theory, the energy flux at a point of spacetime can be negative. This would produce a repulsive gravitational field causing nearby light rays to defocus. This in turn threatens to produce a variety of exotic phenomena including traversable wormholes, warp drives, time machines, and evasion of singularity theorems. I will describe a new "quantum focussing conjecture" that prevents such pathologies. In the flat spacetime limit it reduces to a novel lower bound on the energy density, which can be proven for several classes of field theories.

Speaker information

Aron Wall , Princeton University, USA.

Privacy Settings
Powered by Fruition