Effective actions for Braaten–Pisarski resummation

1993 ◽  
Vol 71 (5-6) ◽  
pp. 219-226 ◽  
Author(s):  
F. T. Brandt ◽  
J. Frenkel ◽  
J. C. Taylor ◽  
S. M. H. Wong
Keyword(s):  
Effective Action ◽  
Hard Thermal Loops

We discuss aspects of the effective action that generates the "hard thermal loops" used in the resummation programme of Braaten and Pisarski.

scholarly journals Effective action for hard thermal loops in gravitational fields

2016 ◽  
Vol 756 ◽  
pp. 205-207
Author(s):  
R.R. Francisco ◽  
J. Frenkel ◽  
J.C. Taylor
Keyword(s):  
Effective Action ◽  
Gravitational Fields ◽  
Hard Thermal Loops

scholarly journals Hard thermal loops, static response, and the composite effective action

1994 ◽  
Vol 49 (12) ◽  
pp. 6787-6793 ◽  
Author(s):  
R. Jackiw ◽  
Q. Liu ◽  
C. Lucchesi
Keyword(s):  
Effective Action ◽  
Static Response ◽  
Hard Thermal Loops

Batalin–Fradkin Approach to (1 + 1)-Dimensional Massive Vector Fields and the Gluonic Effective Action for Hard Thermal Loops

1997 ◽  
Vol 12 (20) ◽  
pp. 3587-3607 ◽  
Author(s):  
Hirohumi Sawayanagi
Keyword(s):  
Effective Action ◽  
Finite Temperature ◽  
Vector Fields ◽  
Original System ◽  
The Other ◽  
Quantum Level ◽  
Massive Vector ◽  
Usual Treatment ◽  
Hard Thermal Loops

The Lagrangian of (1 + 1)-dimensional massive vector fields is studied. Since this system has second class constraints, the method of Batalin–Fradkin, which introduces new fields to convert second class constraints into first class ones, is applied in an extended manner. Instead of the usual treatment, which uses the Stueckelberg field as a new field, we can use a pseudoscalar field. We will show there are at least two ways to introduce a pseudoscalar. At the quantum level, one way leads to the system that is equivalent to the original system, and the other way gives an inequivalent system. The relation of these two ways is clarified. As an application of the latter way, we consider QCD at finite temperature and the gluonic effective action for hard thermal loops is constructed.

The effective action of hard thermal loops in QCD

1990 ◽  
Vol 346 (1) ◽  
pp. 115-128 ◽  
Author(s):  
J.C. Taylor ◽  
S.M.H. Wong
Keyword(s):  
Effective Action ◽  
Hard Thermal Loops

Hard thermal loops and their Noether currents

1993 ◽  
Vol 71 (5-6) ◽  
pp. 300-305 ◽  
Author(s):  
H. Arthur Weldon
Keyword(s):  
Angular Momentum ◽  
Effective Action ◽  
Energy Momentum Tensor ◽  
Axial Vector ◽  
Momentum Density ◽  
Momentum Tensor ◽  
Field Equations ◽  
Nonlocal Field ◽  
N Vector ◽  
Hard Thermal Loops

The effective action found by Braaten and Pisarski, and by Frenkel, Taylor, and Wong that summarizes all hard thermal loops is investigated. Nonlocal field equations for ψ and Aμ are derived. Nonlocal forms are constructed for the U(1)-vector and axial-vector currents, the SU(N)-vector and axial-vector currents, the energy-momentum tensor, and the angular momentum density.

Effective action on global warming?

1990 ◽  
Vol 4 (6) ◽  
pp. 262
Author(s):  
P.R. Wyman
Keyword(s):  
Global Warming ◽  
Effective Action

scholarly journals More on complex Sachdev-Ye-Kitaev eternal wormholes

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Pengfei Zhang
Keyword(s):  
Black Hole ◽  
Ground State ◽  
Effective Action ◽  
Chemical Potential ◽  
Specific Charge ◽  
Zero Temperature ◽  
Small Coupling ◽  
Chemical Potentials ◽  
Quench Dynamics ◽  
Two Sides

Abstract In this work, we study a generalization of the coupled Sachdev-Ye-Kitaev (SYK) model with U(1) charge conservations. The model contains two copies of the complex SYK model at different chemical potentials, coupled by a direct hopping term. In the zero-temperature and small coupling limit with small averaged chemical potential, the ground state is an eternal wormhole connecting two sides, with a specific charge Q = 0, which is equivalent to a thermofield double state. We derive the conformal Green’s functions and determine corresponding IR parameters. At higher chemical potential, the system transit into the black hole phase. We further derive the Schwarzian effective action and study its quench dynamics. Finally, we compare numerical results with the analytical predictions.

scholarly journals New bi-harmonic superspace formulation of 4D, $$ \mathcal{N} $$ = 4 SYM theory

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
I. L. Buchbinder ◽  
E. A. Ivanov ◽  
V. A. Ivanovskiy
Keyword(s):  
Effective Action ◽  
Harmonic Superspace ◽  
Four Dimensions ◽  
Yang Mills ◽  
Convenient Tool ◽  
Leading Term

Abstract We develop a novel bi-harmonic $$ \mathcal{N} $$ N = 4 superspace formulation of the $$ \mathcal{N} $$ N = 4 supersymmetric Yang-Mills theory (SYM) in four dimensions. In this approach, the $$ \mathcal{N} $$ N = 4 SYM superfield constraints are solved in terms of on-shell $$ \mathcal{N} $$ N = 2 harmonic superfields. Such an approach provides a convenient tool of constructing the manifestly $$ \mathcal{N} $$ N = 4 supersymmetric invariants and further rewriting them in $$ \mathcal{N} $$ N = 2 harmonic superspace. In particular, we present $$ \mathcal{N} $$ N = 4 superfield form of the leading term in the $$ \mathcal{N} $$ N = 4 SYM effective action which was known previously in $$ \mathcal{N} $$ N = 2 superspace formulation.

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