scholarly journals QCD, with strings attached

2016 ◽  
Vol 25 (10) ◽  
pp. 1630006 ◽  
Author(s):  
Alberto Güijosa
Keyword(s):  
String Theory ◽  
Quantum Chromodynamics ◽  
Large Class ◽  
Strong Coupling ◽  
Field Theories ◽  
Strong Coupling Regime ◽  
Efficient Tool ◽  
Strongly Coupled ◽  
Coupled Field ◽  
Gauge Gravity

In the nearly 20 years that have elapsed since its discovery, the gauge-gravity correspondence has become established as an efficient tool to explore the physics of a large class of strongly-coupled field theories. A brief overview is given here of its formulation and a few of its applications, emphasizing attempts to emulate aspects of the strong-coupling regime of quantum chromodynamics (QCD). To the extent possible, the presentation is self-contained, and does not presuppose knowledge of string theory.

scholarly journals Plasmonic quantum effects on single-emitter strong coupling

Nanophotonics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1821-1833 ◽  
Author(s):  
Cristian Ciracì ◽  
Radoslaw Jurga ◽  
Muhammad Khalid ◽  
Fabio Della Sala
Keyword(s):  
Strong Coupling ◽  
Quantum Effects ◽  
Hydrodynamic Theory ◽  
Strong Coupling Regime ◽  
Efficient Tool ◽  
Metallic Particles ◽  
Plasmonic Structures ◽  
Classical Models ◽  
Quantum Hydrodynamic ◽  
Fluorescent Molecules

AbstractCoupling between electromagnetic cavity fields and fluorescent molecules or quantum emitters can be strongly enhanced by reducing the cavity mode volume. Plasmonic structures allow light confinement down to volumes that are only a few cubic nanometers. At such length scales, nonlocal and quantum tunneling effects are expected to influence the emitter interaction with the surface plasmon modes, which unavoidably requires going beyond classical models to accurately describe the electron response at the metal surface. In this context, the quantum hydrodynamic theory (QHT) has emerged as an efficient tool to probe nonlocal and quantum effects in metallic nanostructures. Here, we apply state-of-the-art QHT to investigate the quantum effects on strong coupling of a dipole emitter placed at nanometer distances from metallic particles. A comparison with conventional local response approximation (LRA) and Thomas-Fermi hydrodynamic theory results shows the importance of quantum effects on the plasmon-emitter coupling. The QHT predicts qualitative deviation from LRA in the weak coupling regime that leads to quantitative differences in the strong coupling regime. In nano-gap systems, the inclusion of quantum broadening leads to the existence of an optimal gap size for Rabi splitting that minimizes the requirements on the emitter oscillator strength.

scholarly journals A new constraint on strongly coupled field theories

1999 ◽  
Vol 60 (4) ◽  
Author(s):  
Thomas Appelquist ◽  
Andrew G. Cohen ◽  
Martin Schmaltz
Keyword(s):  
Field Theories ◽  
Strongly Coupled ◽  
Coupled Field

scholarly journals Thermalization of Strongly Coupled Field Theories

2011 ◽  
Vol 106 (19) ◽  
Author(s):  
V. Balasubramanian ◽  
A. Bernamonti ◽  
J. de Boer ◽  
N. Copland ◽  
B. Craps ◽  
...  
Keyword(s):  
Field Theories ◽  
Strongly Coupled ◽  
Coupled Field

scholarly journals Early thermalization, hydrodynamics and energy loss in AdS/CFT

2015 ◽  
Vol 24 (10) ◽  
pp. 1530011 ◽  
Author(s):  
Paul M. Chesler ◽  
Wilke van der Schee
Keyword(s):  
Energy Loss ◽  
Strong Coupling ◽  
Gauge Theories ◽  
Heavy Ion ◽  
Strongly Coupled ◽  
Equilibrium Dynamics ◽  
Ion Collisions ◽  
Far From Equilibrium ◽  
Gauge Gravity ◽  
Gravity Duality

Gauge/gravity duality has provided unprecedented opportunities to study dynamics in certain strongly coupled gauge theories. This review aims to highlight several applications to heavy ion collisions including far-from-equilibrium dynamics, hydrodynamics and jet energy loss at strong coupling.

STRONGLY INTERACTING ELECTROWEAK THEORIES AND THEIR FIVE-DIMENSIONAL ANALOGS AT THE LHC

2009 ◽  
Vol 24 (01) ◽  
pp. 61-80
Author(s):  
ALEX POMAROL
Keyword(s):  
Higgs Boson ◽  
Hadron Collider ◽  
Field Theories ◽  
Hierarchy Problem ◽  
Strongly Coupled ◽  
Composite Higgs ◽  
Strongly Interacting ◽  
Coupled Field ◽  
Electroweak Precision ◽  
Elegant Solution

Strongly interacting theories of electroweak (EW) symmetry breaking provide an elegant solution to the hierarchy problem. In these models the EW symmetry can either be broken without a Higgs or by means of a composite Higgs boson. These scenarios have been recently investigated in the framework of five-dimensional warped models that, according to the AdS/CFT correspondence, have a four-dimensional holographic interpretation in terms of strongly coupled field theories. We describe the minimal Higgsless and composite Higgs model and show how they can successfully pass all the electroweak precision tests and solve the flavor problems. We explore the implications of these models at the LHC (Large Hadron Collider).

scholarly journals Strongly coupled QFT dynamics via TQFT coupling

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Mithat Ünsal
Keyword(s):  
Strong Coupling ◽  
Topological Charge ◽  
Background Field ◽  
Strong Coupling Regime ◽  
Global Symmetry ◽  
Quantum Field Theories ◽  
Strongly Coupled ◽  
Yang Mills ◽  
Mass Gap ◽  
New Perspective

Abstract We consider a class of quantum field theories and quantum mechanics, which we couple to ℤN topological QFTs, in order to classify non-perturbative effects in the original theory. The ℤN TQFT structure arises naturally from turning on a classical background field for a ℤN 0- or 1-form global symmetry. In SU(N) Yang-Mills theory coupled to ℤN TQFT, the non-perturbative expansion parameter is exp[−SI/N] = exp[−8π2/g2N] both in the semi-classical weak coupling domain and strong coupling domain, corresponding to a fractional topological charge configurations. To classify the non-perturbative effects in original SU(N) theory, we must use PSU(N) bundle and lift configurations (critical points at infinity) for which there is no obstruction back to SU(N). These provide a refinement of instanton sums: integer topological charge, but crucially fractional action configurations contribute, providing a TQFT protected generalization of resurgent semi-classical expansion to strong coupling. Monopole-instantons (or fractional instantons) on T3 × $$ {S}_L^1 $$ S L 1 can be interpreted as tunneling events in the ’t Hooft flux background in the PSU(N) bundle. The construction provides a new perspective to the strong coupling regime of QFTs and resolves a number of old standing issues, especially, fixes the conflicts between the large-N and instanton analysis. We derive the mass gap at θ = 0 and gaplessness at θ = π in $$ \mathbbm{CP} $$ CP 1 model, and mass gap for arbitrary θ in $$ \mathbbm{CP} $$ CP N−1, N ≥ 3 on ℝ2.

scholarly journals Inhomogeneous Thermalization in Strongly Coupled Field Theories

2013 ◽  
Vol 111 (23) ◽  
Author(s):  
V. Balasubramanian ◽  
A. Bernamonti ◽  
J. de Boer ◽  
B. Craps ◽  
L. Franti ◽  
...  
Keyword(s):  
Field Theories ◽  
Strongly Coupled ◽  
Coupled Field
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