scholarly journals No-go theorem of anisotropic inflation via Schwinger mechanism

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Hiroyuki Kitamoto
Keyword(s):  
Schwinger Mechanism

scholarly journals A Quantum Kinetic Equation for Particle Production in the Schwinger Mechanism

1998 ◽  
Vol 07 (06) ◽  
pp. 709-722 ◽  
Author(s):  
S. Schmidt ◽  
D. Blaschke ◽  
G. Röpke ◽  
S. A. Smolyansky ◽  
A. V. Prozorkevich ◽  
...  
Keyword(s):  
Kinetic Equation ◽  
Particle Production ◽  
Source Term ◽  
Particle Creation ◽  
Pair Creation ◽  
Density Approximation ◽  
Quantum Kinetic Equation ◽  
Homogeneous Electric Field ◽  
Collisional Damping ◽  
Schwinger Mechanism

A quantum kinetic equation is derived for the description of pair production in a time-dependent homogeneous electric field E(t). As a source term, the Schwinger mechanism for particle creation is incorporated. Possible particle production due to collisions and collisional damping are neglected. The main result is a kinetic equation of non-Markovian character. In the low density approximation, the source term is reduced to the leading part of the well known Schwinger formula for the probability of pair creation. We discuss the momentum and time dependence of the derived source term and compare with other approaches.

scholarly journals QUANTUM LOGIC GATES USING q-DEFORMED OSCILLATORS

2006 ◽  
Vol 04 (02) ◽  
pp. 297-305 ◽  
Author(s):  
DEBASHIS GANGOPADHYAY ◽  
MAHENDRA NATH SINHA ROY
Keyword(s):  
Angular Momentum ◽  
Phase Shift ◽  
Quantum Logic ◽  
Logic Gates ◽  
Quantum Logic Gates ◽  
Single Qubit ◽  
Schwinger Mechanism

We show that quantum logic gates, viz. the single qubit Hadamard and Phase Shift gates, can also be realized using q-deformed angular momentum states constructed via the Jordan–Schwinger mechanism with two q-deformed oscillators.

scholarly journals Chirality production with mass effects — Schwinger pair production and the axial Ward identity

2020 ◽  
Vol 35 (28) ◽  
pp. 203005
Author(s):  
Patrick Copinger ◽  
Shi Pu
Keyword(s):  
Ward Identity ◽  
Chiral Condensate ◽  
Magnetic Effect ◽  
Chiral Anomaly ◽  
Expectation Values ◽  
Mass Effects ◽  
Chiral Magnetic Effect ◽  
Time Formalism ◽  
Background Fields ◽  
Schwinger Mechanism

The anomalous generation of chirality with mass effects via the axial Ward identity and its dependence on the Schwinger mechanism is reviewed, utilizing parity violating homogeneous electromagnetic background fields. The role vacuum asymptotic states play on the interpretation of expectation values is examined. It is discussed that observables calculated with an in–out scattering matrix element predict a scenario under Euclidean equilibrium. A notable ramification of which is a vanishing of the chiral anomaly. In contrast, it is discussed observables calculated under an in–in, or real-time, formalism predict a scenario out-of equilibrium, and capture effects of mean produced particle–antiparticle pairs due to the Schwinger mechanism. The out-of equilibrium chiral anomaly is supplemented with exponential quadratic mass suppression as anticipated for the Schwinger mechanism. Similar behavior in and out-of equilibrium is reviewed for applications including the chiral magnetic effect and chiral condensate.

SCHWINGER MECHANISM AND STABILITY OF GAUGE SYMMETRY

1987 ◽  
Vol 02 (07) ◽  
pp. 525-529 ◽  
Author(s):  
MARCO FABBRICHESI
Keyword(s):  
Gauge Symmetry ◽  
Mass Generation ◽  
Simple Argument ◽  
Dynamical Mass ◽  
Abelian Field ◽  
Schwinger Mechanism ◽  
Dynamical Mass Generation

The Schwinger mechanism for dynamical mass generation in a SU (N) non-Abelian field is considered. A simple argument is given to prove the impossibility of such a mechanism.

Extremely short optical pulses and superstrings

2020 ◽  
Vol 35 (27) ◽  
pp. 2050221
Author(s):  
Mikhail B. Belonenko ◽  
Natalia N. Konobeeva ◽  
Alexander V. Zhukov
Keyword(s):  
Numerical Solution ◽  
Effective Action ◽  
Optical Pulse ◽  
Optical Pulses ◽  
Maxwell’S Equation ◽  
Pulse Dynamics ◽  
Short Optical Pulse ◽  
Time Space ◽  
Extremely Short Optical Pulses ◽  
Schwinger Mechanism

We analyze the propagation of an extremely short optical pulse from the numerical solution of the Maxwell’s equation related to the effective action obtained in the framework of the theory of superstrings in flat time space. The pulse dynamics turned out to be unstable and eventually leads to a collapse. We particularly analyze the Schwinger mechanism which occurs during the collapse of the pulse.

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