scholarly journals Holographic Schwinger Effect in a Confining D3-Brane Background with Chemical Potential

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Zi-qiang Zhang ◽  
De-fu Hou ◽  
Yan Wu ◽  
Gang Chen
Keyword(s):  
Electric Field ◽  
Pair Production ◽  
Numerical Method ◽  
Production Rate ◽  
External Electric Field ◽  
Critical Field ◽  
Test Particle ◽  
Chemical Potential ◽  
Particle Pair ◽  
Schwinger Effect

Using the AdS/CFT correspondence, we investigate the Schwinger effect in a confining D3-brane background with chemical potential. The potential between a test particle pair on the D3-brane in an external electric field is obtained. The critical fieldEcin this case is calculated. Also, we apply numerical method to evaluate the production rate for various cases. The results imply that the presence of chemical potential tends to suppress the pair production effect.

scholarly journals Holographic Description of Noncommutative Schwinger Effect

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Udit Narayan Chowdhury
Keyword(s):  
Electric Field ◽  
Pair Production ◽  
Production Rate ◽  
External Electric Field ◽  
Deformation Parameter ◽  
Yang Mills ◽  
First Order ◽  
Schwinger Effect ◽  
Holographic Description

We consider the phenomenon of spontaneous pair production in the presence of an external electric field for noncommutative Yang-Mills theories. Using Maldacena’s holographic conjecture, the threshold electric field for pair production is computed from the quark/antiquark potential for noncommutative theories. As an effect of noncommutativity, the threshold electric field is seen to be smaller than its commutative counterpart. We also estimate the correction to the production rate of quark/antiquark pairs to the first order of the noncommutative deformation parameter. Our result bears resemblance with an earlier related work (based on field-theoretic methods).

THE SEARCH FOR THE SCHWINGER EFFECT: NONPERTURBATIVE VACUUM PAIR PRODUCTION

2010 ◽  
Vol 25 (11) ◽  
pp. 2373-2381 ◽  
Author(s):  
GERALD V. DUNNE
Keyword(s):  
Electric Field ◽  
Pair Production ◽  
External Electric Field ◽  
High Intensity ◽  
Laser Pulses ◽  
New Developments ◽  
Electron Positron ◽  
Relativistic Regime ◽  
Schwinger Effect ◽  
Intensity Regime

The Schwinger effect is the non-perturbative production of electron-positron pairs when an external electric field is applied to the quantum electrodynamical (QED) vacuum. The inherent instability of the vacuum in an electric field was one of the first non-trivial predictions of QED, but the effect is so weak that it has not yet been directly observed. However, there are exciting new developments in ultra-high intensity lasers, which may bring us to the verge of this extreme ultra-relativistic regime. This necessitates a fresh look at both experimental and theoretical aspects of the Schwinger effect. I describe some new theoretical ideas aimed at making this elusive effect observable, by careful shaping of the laser pulses, much as is done [in a different intensity regime] in the fast-developing field of atto-science.

scholarly journals Axion assisted Schwinger effect

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Valerie Domcke ◽  
Yohei Ema ◽  
Kyohei Mukaida
Keyword(s):  
Electric Field ◽  
Production Rate ◽  
Strong Electric Field ◽  
Background Field ◽  
Chiral Anomaly ◽  
Fermion Mass ◽  
Anomaly Equation ◽  
Electric And Magnetic Fields ◽  
Schwinger Effect ◽  
Momentum Transverse

Abstract We point out an enhancement of the pair production rate of charged fermions in a strong electric field in the presence of time dependent classical axion-like background field, which we call axion assisted Schwinger effect. While the standard Schwinger production rate is proportional to $$ \exp \left(-\pi \left({m}^2+{p}_T^2\right)/E\right) $$ exp − π m 2 + p T 2 / E , with m and pT denoting the fermion mass and its momentum transverse to the electric field E, the axion assisted Schwinger effect can be enhanced at large momenta to exp(−πm2/E). The origin of this enhancement is a coupling between the fermion spin and its momentum, induced by the axion velocity. As a non-trivial validation of our result, we show its invariance under field redefinitions associated with a chiral rotation and successfully reproduce the chiral anomaly equation in the presence of helical electric and magnetic fields. We comment on implications of this result for axion cosmology, focussing on axion inflation and axion dark matter detection.

scholarly journals Holographic Schwinger effect with a deformed AdS background

2017 ◽  
Vol 32 (10) ◽  
pp. 1750045 ◽  
Author(s):  
J. Sadeghi ◽  
B. Pourhassan ◽  
S. Tahery ◽  
F. Razavi
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Electrostatic Potential ◽  
Deformation Parameter ◽  
Zero Temperature ◽  
Test Particles ◽  
Schwinger Effect

In this paper, we consider a deformed AdS background and study the effect of deformation parameter on the pair production rate of the Schwinger effect. The electrostatic potential is important for the pair production in the holographic Schwinger effect. In this paper, we analyze the electrostatic potential in a deformed AdS background and investigate the effect of deformation parameter which may be useful to test the AdS/QCD. In the case of zero temperature, we find that the larger value of the deformation parameter leads to a smaller value of separation length of the test particles on the probe. Also, we find a finite maximum of separation length in the presence of modification parameter.

scholarly journals LONG TIME SIMULATION OF A BEAM IN A PERIODIC FOCUSING CHANNEL VIA A TWO-SCALE PIC-METHOD

2009 ◽  
Vol 19 (02) ◽  
pp. 175-197 ◽  
Author(s):  
EMMANUEL FRÉNOD ◽  
FRANCESCO SALVARANI ◽  
ERIC SONNENDRÜCKER
Keyword(s):  
Electric Field ◽  
Numerical Method ◽  
External Electric Field ◽  
Time Scales ◽  
Asymptotic State ◽  
Limit Model ◽  
Time Simulation ◽  
Charged Beam ◽  
Long Time ◽  
Pic Method

We study the two-scale asymptotics for a charged beam under the action of a rapidly oscillating external electric field. After proving the convergence to the correct asymptotic state, we develop a numerical method for solving the limit model involving two time scales and validate its efficiency for the simulation of long time beam evolution.

scholarly journals A holographic description of the Schwinger effect in a confining gauge theory

2015 ◽  
Vol 30 (11) ◽  
pp. 1530026 ◽  
Author(s):  
Daisuke Kawai ◽  
Yoshiki Sato ◽  
Kentaroh Yoshida
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Electric Fields ◽  
String Tension ◽  
Critical Value ◽  
Remarkable Feature ◽  
Coulomb Phase ◽  
Holographic Approach ◽  
Schwinger Effect ◽  
Holographic Description

This is a review of the recent progress on a holographic description of the Schwinger effect. In 2011, Semenoff and Zarembo proposed a scenario to study the Schwinger effect in the context of the AdS/CFT correspondence. The production rate of quark–antiquark pairs was computed in the Coulomb phase. In particular, it provided the critical value of external electric field, above which particles are freely created and the vacuum decays catastrophically. Then the potential analysis in the holographic approach was invented and it enabled us to study the Schwinger effect in the confining phase as well. A remarkable feature of the Schwinger effect in the confining phase is to exhibit another kind of the critical value, below which the pair production cannot occur and the vacuum of the system is nonperturbatively stable. The critical value is tantamount to the confining string tension. We computed the pair production rate numerically and introduced new exponents associated with the critical electric fields.

scholarly journals Schwinger mechanism in electromagnetic field in de Sitter spacetime

2018 ◽  
Vol 168 ◽  
pp. 03002 ◽  
Author(s):  
Ehsan Bavarsad ◽  
Sang Pyo Kim ◽  
Clément Stahl ◽  
She-Sheng Xue
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Pair Production ◽  
Production Rate ◽  
De Sitter ◽  
Sitter Spacetime ◽  
Constant Electromagnetic Field ◽  
Electric And Magnetic Fields ◽  
Schwinger Mechanism

We investigate Schwinger scalar pair production in a constant electromagnetic field in de Sitter (dS) spacetime. We obtain the pair production rate, which agrees with the Hawking radiation in the limit of zero electric field in dS. The result describes how a cosmic magnetic field affects the pair production rate. In addition, using a numerical method we study the effect of the magnetic field on the induced current. We find that in the strong electromagnetic field the current has a linear response to the electric and magnetic fields, while in the infrared regime, is inversely proportional to the electric field and leads to infrared hyperconductivity.

scholarly journals Fermion production by a dependent of time electric field in de Sitter universe

2017 ◽  
Vol 32 (36) ◽  
pp. 1750208 ◽  
Author(s):  
Mihaela-Andreea Băloi ◽  
Cosmin Crucean
Keyword(s):  
Electric Field ◽  
Pair Production ◽  
External Electric Field ◽  
Early Universe ◽  
Total Probability ◽  
De Sitter ◽  
Expansion Factor ◽  
Gravitational Fields ◽  
De Sitter Universe ◽  
Strong Gravitational Fields

Fermion production in external electric field on de Sitter expanding universe is analyzed. The amplitude and probability of pair production are computed. We obtain from our calculations that the modulus of the momentum is no longer conserved. The rate of pair production in an electric field is found to be important in the early universe when the expansion factor was large comparatively with the particle mass. A computation of the total probability is presented in a particular case and the result proves to be nonvanishing only in strong gravitational fields.

scholarly journals Real Time Dynamics and Confinement in the Zn Schwinger-Weyl lattice model for 1+1 QED

Quantum ◽  
2020 ◽  
Vol 4 ◽  
pp. 281 ◽  
Author(s):  
Giuseppe Magnifico ◽  
Marcello Dalmonte ◽  
Paolo Facchi ◽  
Saverio Pascazio ◽  
Francesco V. Pepe ◽  
...  
Keyword(s):  
Electric Field ◽  
System Dynamics ◽  
Pair Production ◽  
External Electric Field ◽  
Lattice Model ◽  
Quantum Electrodynamics ◽  
Time Dynamics ◽  
Schwinger Model ◽  
Breaking Mechanism ◽  
The Stability

We study the out-of-equilibrium properties of 1+1 dimensional quantum electrodynamics (QED), discretized via the staggered-fermion Schwinger model with an Abelian Zn gauge group. We look at two relevant phenomena: first, we analyze the stability of the Dirac vacuum with respect to particle/antiparticle pair production, both spontaneous and induced by an external electric field; then, we examine the string breaking mechanism. We observe a strong effect of confinement, which acts by suppressing both spontaneous pair production and string breaking into quark/antiquark pairs, indicating that the system dynamics displays a number of out-of-equilibrium features.

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