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In wellbehaved classical systems, the lightlike components of the stressenergy are positive. For a gravitating system, this implies gravitational lensing, which in turn leads to many famous results about general relativity. Ordinary states in QFT, however, can violate this positivity property. A quantum gravity generalization of gravitational lensing, called “quantum focusing” has recently been conjectured. Its nongravitational limit, the quantum null energy condition, was recently proven. In this talk, I will use gauge/gravity duality to prove an integrated version of the fully gravitational quantum focusing conjecture, to first subleading order in quantum fluctuations of the spacetime.
\n\nSPEAKER:
Netta Engelhardt, Princeton University
464 Loomis
falseMathematical and Theoretical Physics Seminar: Towards a Proof of Quantum Focusing
Speaker 
(signup)
Netta Engelhardt, Princeton University 

Date:  11/29/2018 
Time:  12:30 p.m. 
Location:  464 Loomis 
Sponsor:  Physics 
Event Type:  Seminar/Symposium 
In wellbehaved classical systems, the lightlike components of the stressenergy are positive. For a gravitating system, this implies gravitational lensing, which in turn leads to many famous results about general relativity. Ordinary states in QFT, however, can violate this positivity property. A quantum gravity generalization of gravitational lensing, called “quantum focusing” has recently been conjectured. Its nongravitational limit, the quantum null energy condition, was recently proven. In this talk, I will use gauge/gravity duality to prove an integrated version of the fully gravitational quantum focusing conjecture, to first subleading order in quantum fluctuations of the spacetime.

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