MG14 - Talk detail |
Participant |
Parikh , Maulik | |||||||
Institution |
Arizona state university - Department of Physics - Tempe - Arizona - USA | |||||||
Session |
AT3 |
Accepted |
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Order |
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Talk |
Oral abstract |
Title |
Two Roads to the Null Energy Condition | |||||
Coauthors | ||||||||
Abstract |
The null energy condition has sweeping consequences in general relativity. We argue here that it has been misunderstood as a property of matter, when in fact it is better viewed as a constraint on spacetime geometry. We then derive precisely the geometric formulation of the null energy condition from worldsheet string theory, where it is simply the Virasoro condition for a closed string moving in a curved background. But further, we show that there is an entirely different thermodynamic origin of the null energy condition, if gravity emerges from some holographic theory. Thus, rather than being an incidental property of matter, the validity of the null energy condition appears to hint at the origins of gravity. |
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Pdf file |
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Session |
ES3 |
Accepted |
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Time |
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Talk |
Oral abstract |
Title |
The Physical Origin of the Null Energy Condition | |||||
Coauthors | ||||||||
Abstract |
The energy conditions are seemingly reasonable but ad hoc assumptions about matter that are used to greatly constrain the set of physical solutions to Einstein's equations. However, the energy conditions have thus far lacked a physical origin. Here I derive the null energy condition from first principles in two different ways. This at last provides a physical basis for the most important local constraint on solutions of Einstein's equations. |
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Pdf file |
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Session |
BH5 |
Accepted |
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Time |
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Talk |
Oral abstract |
Title |
The Volume of Black Holes | |||||
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Abstract |
We propose a simple definition of volume for stationary spacetimes. The proposed volume is constant in time, independent of the choice of stationary time slicing, and applies even in the absence of a globally timelike Killing vector. If time permits, we will also discuss the effect of topology on black hole nucleation. |
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Pdf file |
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Session |
ST2 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Rindler-AdS/CFT | |||||
Coauthors | ||||||||
Abstract |
In anti-de Sitter space a highly accelerating observer perceives a Rindler horizon. For AdS3, the holographic duality is especially tractable, allowing quantum-gravitational aspects of Rindler horizons to be probed. We recover the thermodynamics of Rindler-AdS space directly from the boundary conformal field theory. We derive the temperature from the two-point function and obtain the Rindler entropy density precisely, including numerical factors, using the Cardy formula. We also probe the causal structure of the spacetime, and find from the behavior of the one-point function that the CFT knows when a source has fallen across the Rindler horizon. |
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Pdf file |
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