scholarly journals Effective action for cosmological scalar fields at finite temperature

2015 ◽  
Vol 2015 (8) ◽  
Author(s):  
Yeuk-Kwan E. Cheung ◽  
Marco Drewes ◽  
Jin U Kang ◽  
Jong Chol Kim
Keyword(s):  
Effective Action ◽  
Finite Temperature ◽  
Scalar Fields ◽  
Cosmological Scalar

scholarly journals CLASSICAL AND QUANTUM TIME DEPENDENT SOLUTIONS IN STRING THEORY

2004 ◽  
Vol 19 (32) ◽  
pp. 5651-5661 ◽  
Author(s):  
C. MARTÍNEZ-PRIETO ◽  
O. OBREGÓN ◽  
J. SOCORRO
Keyword(s):  
Quantum Mechanics ◽  
Effective Action ◽  
Scalar Fields ◽  
Time Dependent ◽  
Interpretation Of Quantum Mechanics ◽  
Quantum Time ◽  
Dependent Model ◽  
Classical Behavior ◽  
Time Dependent Model ◽  
Friedmann Robertson Walker

Using the ontological interpretation of quantum mechanics in a particular sense, we obtain the classical behavior of the scale factor and two scalar fields, derived from a string effective action for the Friedmann–Robertson–Walker (FRW) time dependent model. Besides, the Wheeler–DeWitt equation is solved exactly. We speculate that the same procedure could also be applied to S-branes.

scholarly journals Finite-temperature effective action and thermalization of perturbations

1994 ◽  
Vol 422 (3) ◽  
pp. 521-540 ◽  
Author(s):  
Per Elmfors ◽  
Kari Enqvist ◽  
Iiro Vilja
Keyword(s):  
Effective Action ◽  
Finite Temperature

scholarly journals Long-wavelength modes of cosmological scalar fields

2006 ◽  
Vol 73 (12) ◽  
Author(s):  
Marcin Jankiewicz ◽  
Thomas W. Kephart
Keyword(s):  
Scalar Fields ◽  
Long Wavelength ◽  
Cosmological Scalar

scholarly journals Analytic Results in (2+1)-Dimensional Finite Temperature LGT

1997 ◽  
Vol 12 (32) ◽  
pp. 5753-5766 ◽  
Author(s):  
M. Billó ◽  
M. Caselle ◽  
A. D'Adda
Keyword(s):  
Monte Carlo ◽  
Effective Action ◽  
Finite Temperature ◽  
Mean Field ◽  
Polyakov Loop ◽  
Critical Coupling ◽  
Dimensional Theory ◽  
Field Techniques ◽  
Large N ◽  
Good Agreement

In a (2 + 1)-dimensional pure LGT at finite temperature the critical coupling for the deconfinement transition scales as βc(nt) = Jcnt + a1, where nt is the number of links in the "timelike" direction of the symmetric lattice. We study the effective action for the Polyakov loop obtained by neglecting the spacelike plaquettes, and we are able to compute analytically in this context the coefficient a1 for any SU(N) gauge group; the value of Jc is instead obtained from the effective action by means of (improved) mean field techniques. Both coefficients have already been calculated in the large N limit in a previous paper. The results are in very good agreement with the existing Monte Carlo simulations. This fact supports the conjecture that, in the (2 + 1)-dimensional theory, spacelike plaquettes have little influence on the dynamics of the Polyakov loops in the deconfined phase.

scholarly journals CENTRAL CHARGES AND EFFECTIVE ACTION AT FINITE TEMPERATURE AND DENSITY

2004 ◽  
Vol 19 (03) ◽  
pp. 223-238 ◽  
Author(s):  
J. GAMBOA ◽  
J. LÓPEZ-SARRIÓN ◽  
M. LOEWE ◽  
F. MÉNDEZ
Keyword(s):  
Explicit Expression ◽  
Current Algebra ◽  
Effective Action ◽  
Finite Temperature ◽  
Gauge Theories ◽  
Central Charge ◽  
Thirring Model ◽  
Coupling Constant ◽  
Four Dimensions

The current algebra for gauge theories like QCD at finite temperature and density is studied. We start considering, the massless Thirring model at finite temperature and density, finding an explicit expression for the current algebra. The central charge only depends on the coupling constant and there are not new effects due to temperature and density. From this calculation, we argue how to compute the central charge for QCD4 and we argue why the central charge in four dimensions could be modified by finite temperature and density.

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