scholarly journals Conditions for Vacuum Instability in Holographic Theories with Dilaton Field

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Sara Tahery ◽  
Sreeraj Nair ◽  
Pengming Zhang
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Potential Barrier ◽  
Scale Parameter ◽  
Radial Coordinate ◽  
Dilaton Field ◽  
Whole Process ◽  
Vacuum Instability ◽  
Probe Brane

We investigate the vacuum instability in the presence of dilaton field in a holographic setup. Although the dilaton is a bulk field, it leads to the vacuum instability on the boundary. We show that the whole process crucially depends on the probe brane position and as well on the radial coordinate so that the effects of dilaton scale parameter in different regions of the bulk or for different probe brane positions are different. We also observe that in our study, the temperature can strengthen the effect of scale parameter in reducing the potential barrier. Finally, we show that this Schwinger-like effect, although is interesting by itself, does not produce a considerable pair production rate.

Vacuum Instability and Pair Production in an Optical Setting

2012 ◽  
Vol 109 (11) ◽  
Author(s):  
F. Dreisow ◽  
S. Longhi ◽  
S. Nolte ◽  
A. Tünnermann ◽  
A. Szameit
Keyword(s):  
Pair Production ◽  
Vacuum Instability

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 Two new submodels for the Modular Earth Submodel System (MESSy): New Aerosol Nucleation (NAN) and small ions (IONS) version 1.0

2018 ◽  
Author(s):  
Sebastian Ehrhart ◽  
Eimear M. Dunne ◽  
Hanna E. Manninen ◽  
Tuomo Nieminen ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Aerosol Particle ◽  
Atmospheric Chemistry ◽  
Particle Formation ◽  
Ion Pair ◽  
New Particle Formation ◽  
Production Rates ◽  
Organic Species ◽  
Good Agreement

Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation submodel (NAN) includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric chemistry - Climate (EMAC) model. The Ion pair production rate, needed to calculate the ion-induced or -mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground based observations.

scholarly journals Two new submodels for the Modular Earth Submodel System (MESSy): New Aerosol Nucleation (NAN) and small ions (IONS) version 1.0

2018 ◽  
Vol 11 (12) ◽  
pp. 4987-5001
Author(s):  
Sebastian Ehrhart ◽  
Eimear M. Dunne ◽  
Hanna E. Manninen ◽  
Tuomo Nieminen ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Aerosol Particle ◽  
Atmospheric Chemistry ◽  
Particle Formation ◽  
Ion Pair ◽  
New Particle Formation ◽  
Production Rates ◽  
Organic Species ◽  
Good Agreement

Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation (NAN) submodel includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The ion pair production rate, needed to calculate the ion-induced or ion-mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground-based observations.

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 Two-loop Euler–Heisenberg QED pair-production rate

2000 ◽  
Vol 564 (3) ◽  
pp. 591-604 ◽  
Author(s):  
Gerald V. Dunne ◽  
Christian Schubert
Keyword(s):  
Pair Production ◽  
Production Rate

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).

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