Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-03-28
Phys.Rev.D79:025006,2009
Physics
High Energy Physics
High Energy Physics - Theory
27 pages, final version
Scientific paper
10.1103/PhysRevD.79.025006
Standard entropy calculations in quantum field theory, when applied to a subsystem of definite volume, exhibit area-dependent UV divergences that make a thermodynamic interpretation troublesome. In this paper we define a renormalized entropy which is related with the Newton-Wigner position operator. Accordingly, whenever we trace over a region of space, we trace away degrees of freedom that are localized according to Newton-Wigner localization but not in the usual sense. We consider a free scalar field in d+1 spacetime dimensions prepared in a thermal state and we show that our entropy is free of divergences and has a perfectly sound thermodynamic behavior. In the high temperature/big volume limit our results agree with the standard QFT calculations once the divergent contributions are subtracted from the latter. In the limit of low temperature/small volume the entropy goes to zero but with a different dependence on the temperature.
Cacciatori Sergio
Costa Fabio
Piazza Federico
No associations
LandOfFree
Renormalized Thermal Entropy in Field Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Renormalized Thermal Entropy in Field Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Renormalized Thermal Entropy in Field Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-173823