CaltechAUTHORS
  A Caltech Library Service

What is the Entropy in Entropic Gravity?

Carroll, Sean M. and Remmen, Grant N. (2016) What is the Entropy in Entropic Gravity? Physical Review D, 93 (12). Art. No. 124052. ISSN 2470-0010. http://resolver.caltech.edu/CaltechAUTHORS:20160210-142850363

[img] PDF - Published Version
See Usage Policy.

309Kb
[img] PDF - Submitted Version
See Usage Policy.

1288Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20160210-142850363

Abstract

We investigate theories in which gravity arises as a consequence of entropy. We distinguish between two approaches to this idea: holographic gravity, in which Einstein’s equation arises from keeping entropy stationary in equilibrium under variations of the geometry and quantum state of a small region, and thermodynamic gravity, in which Einstein’s equation emerges as a local equation of state from constraints on the area of a dynamical light sheet in a fixed spacetime background. Examining holographic gravity, we argue that its underlying assumptions can be justified in part using recent results on the form of the modular energy in quantum field theory. For thermodynamic gravity, on the other hand, we find that it is difficult to formulate a self-consistent definition of the entropy, which represents an obstacle for this approach. This investigation points the way forward in understanding the connections between gravity and entanglement.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.93.124052DOIArticle
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.124052PublisherArticle
http://arxiv.org/abs/1601.07558arXivDiscussion Paper
ORCID:
AuthorORCID
Carroll, Sean M.0000-0002-4226-5758
Remmen, Grant N.0000-0001-6569-8866
Additional Information:© 2016 American Physical Society. Received 29 January 2016; published 21 June 2016. We thank Cliff Cheung, Ted Jacobson, and Hirosi Ooguri for conversations that helped us considerably improve upon an earlier draft of this paper. This research is funded in part by the Walter Burke Institute for Theoretical Physics at Caltech, by DOE Grant No. DE-SC0011632, and by the Gordon and Betty Moore Foundation through Grant No. 776 to the Caltech Moore Center for Theoretical Cosmology and Physics. G. N. R. is supported by a Hertz Graduate Fellowship and a NSF Graduate Research Fellowship under Grant No. DGE-1144469.
Group:Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
Funders:
Funding AgencyGrant Number
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Department of Energy (DOE)DE-SC0011632
Gordon and Betty Moore Foundation776
Caltech Moore Center for Theoretical Cosmology and PhysicsUNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
NSF Graduate Research FellowshipDGE-1144469
Other Numbering System:
Other Numbering System NameOther Numbering System ID
CALT-TH2015-038
Record Number:CaltechAUTHORS:20160210-142850363
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160210-142850363
Official Citation:What is the entropy in entropic gravity? Sean M. Carroll and Grant N. Remmen Phys. Rev. D 93, 124052
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64381
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:10 Feb 2016 23:36
Last Modified:30 Mar 2017 22:16

Repository Staff Only: item control page