scholarly journals A semi-classical study on the Sauter-Schwinger effect of lepton antilepton pairs in vacuum

2020 ◽  
Vol 16 ◽  
pp. 103108
Author(s):  
A.M.M. Elsayed ◽  
M.E Medhat ◽  
S. Amanzholova
Keyword(s):  
Classical Study ◽  
Schwinger Effect

Correlation of Phraseological Semantic Fields in Russian Study of Aphorisms

2020 ◽  
pp. 60-71
Author(s):  
Anshelika Korolkova
Keyword(s):  
Negative Correlation ◽  
Semantic Field ◽  
Positive Correlation ◽  
Classical Study ◽  
Semantic Fields ◽  
Zero Correlation ◽  
Russian Study

The article deals with the interconnection and interdependence of phraseological semantic fields of Russian study of aphorisms in synchronic and in diachronic approaches. The correlation of phraseological semantic fields of Russian study of aphorisms is considered as their interdependence due to various factors (linguistic and extra-linguistic ones). The correlation of the phraseological semantic fields of Russian study of aphorisms is manifested in the existence of many antinomies. The natural linguistic antinomies of life / death / immortality or war / peace, or good / evil, or friend / enemy, or villainy / nobility are reflected in Russian aphorisms and have entered the corresponding phraseological semantic fields. The corpus of Russian study of aphorisms containsnot only antinomic aphorisms, but also antinomic relations that extend to the level of language and speech. Therefore, in Russian study of aphorisms there are phraseological semantic fields that implement these antinomies. In addition to the antinomic phraseological semantic fields in the corpus of classical Russian study of aphorisms there are other types of correlations. The keywords (concepts) of many phraseological semantic fields are closely thematically connected. When the number of units from one field is changed, the number of units in another phraseological semantic field also changes. Most phraseological semantic fields of Russian study of aphorisms do not show a zero correlation in either synchronic or diachronic approaches. This is due to, first of all, the universality of the aphoristic theme, with all the ideological and thematic uniqueness of the sayings used by Russian writers. However, a few phraseological and semantic fields of aphorisms by Russian writers may show a negative correlation, which is due to the diversity of the thematic groups that comprise them. A positive correlation of phraseological semantic fields, the most significant in the number of their constituent components, shows deep internal linguistic systemic connections in Russian classical study of aphorisms.

scholarly journals Radiation signal accompanying the Schwinger effect

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
I. A. Aleksandrov ◽  
A. D. Panferov ◽  
S. A. Smolyansky
Keyword(s):  
Schwinger Effect

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 Prefactor in the dynamically assisted Sauter-Schwinger effect

2016 ◽  
Vol 94 (8) ◽  
Author(s):  
Christian Schneider ◽  
Ralf Schützhold
Keyword(s):  
Schwinger Effect

scholarly journals Schwinger effect in compact space

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Prasant Samantray ◽  
Suprit Singh
Keyword(s):  
Compact Space ◽  
Schwinger Effect

Schwinger effect in an instanton background with electric and magnetic fields via holography

2018 ◽  
Vol 33 (25) ◽  
pp. 1850144
Author(s):  
Maryam Gholizadeh Arashti ◽  
Majid Dehghani
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Production Rate ◽  
Pair Creation ◽  
Zero Temperature ◽  
Expectation Value ◽  
Background Magnetic Field ◽  
Electric And Magnetic Fields ◽  
Schwinger Effect ◽  
Horizon Limit

The Schwinger effect in the presence of instantons and background magnetic field was considered to study the dependence of critical electric field on instanton density and magnetic field using AdS/CFT conjecture. The gravity side is the near horizon limit of D3[Formula: see text]D(−[Formula: see text]1) background with electric and magnetic fields on the brane. Our approach is based on the potential analysis for particle–antiparticle pair at zero and finite temperatures, where the zero temperature case is a semi-confining theory. We find that presence of instantons suppresses the pair creation effect, similar to a background magnetic field. Then, the production rate will be obtained numerically using the expectation value of circular Wilson loop. The obtained production rate in a magnetic field is in agreement with previous results.

[Editorial: Harvard University and Classical Study]

1913 ◽  
Vol 6 (14) ◽  
pp. 105
Author(s):  
Gonzalez Lodge
Keyword(s):  
Harvard University ◽  
Classical Study

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 Cliff collapse at Stevns Klint, south-east Denmark

1969 ◽  
Vol 26 ◽  
pp. 33-36
Author(s):  
Stig A. Schack Pedersen ◽  
Tove Damholt
Keyword(s):  
East Coast ◽  
Classical Study ◽  
Rock Types ◽  
Storm Waves ◽  
The World ◽  
Coastal Cliff ◽  
The Difference

The scenic coastal cliff of Stevns Klint is a classical study locality that stretches for 15 km along the east coast of Sjælland and it holds arguably the best exposed Cretaceous−Tertiary boundary in the world (Fig. 1; Damholt & Surlyk 2012). The famous boundary separates the soft Cretaceous chalk from the harder overlying Tertiary bryozoan limestone (Fig. 2), and the difference between the two rock types controls the character of the frequent cliff falls. The relatively soft chalk at the base is eroded by storm waves and is subject to general debris shedding. The overlying bryozoan limestone, with its hardgrounds and flint layers, is more resistant to erosion and is strong enough to form overhanging projections of the coastal cliff that result in large and small recurring collapses.

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