Dissipation of quantum fields from particle creation

1989 ◽  
Vol 40 (2) ◽  
pp. 656-659 ◽  
Author(s):  
E. Calzetta ◽  
B. L. Hu
Keyword(s):  
Particle Creation ◽  
Quantum Fields

scholarly journals COSMOLOGICAL PARTICLE CREATION: FLUCTUATIONS AND AN ENSEMBLE PICTURE

2008 ◽  
Vol 17 (13n14) ◽  
pp. 2441-2445 ◽  
Author(s):  
ALI KAYA
Keyword(s):  
Wave Packets ◽  
Particle Creation ◽  
Mean Value ◽  
Time Dependent ◽  
Quantum Fields ◽  
Number Operator ◽  
Expectation Value ◽  
Reheating Process ◽  
Ensemble Interpretation

We point out that in the context of quantum fields in time-dependent classical backgrounds, the number of created particles with a given momentum largely deviates about its mean value. Since the corresponding Fourier modes are nonlocal, this deviation shows that the expectation value of the number operator can make sense only in an ensemble of space–times. Using a complete orthonormal family of localized wave packets, we show how an ensemble interpretation can be given to cosmological particle creation in local terms. The reheating process following inflation is re-examined in the light of this construction.

scholarly journals SQUEEZED VACUA AND THE QUANTUM STATISTICS OF COSMOLOGICAL PARTICLE CREATION

1994 ◽  
Vol 09 (07) ◽  
pp. 991-1007 ◽  
Author(s):  
B. L. HU ◽  
G. KANG ◽  
A. MATACZ
Keyword(s):  
Coherent State ◽  
Particle Number ◽  
Particle Creation ◽  
Space Time ◽  
Quantum Statistics ◽  
Squeezed States ◽  
Quantum Fields ◽  
Squeezed State ◽  
Initial State ◽  
Systematic Description

We use the language of squeezed states to give a systematic description of two issues in cosmological particle creation: (a) Dependence of particle creation on the initial state specified; we consider in particular the number state, the coherent state and the squeezed state; (b) the relation of spontaneous and stimulated particle creation and their dependence on the initial state. We also present results for the fluctuations in particle number in anticipation of its relevance to defining noise in quantum fields and the vacuum susceptibility of space–time.

scholarly journals A possible semiclassical bounce instead of a Schwarzschild singularity

2020 ◽  
Vol 35 (02n03) ◽  
pp. 2040051
Author(s):  
K. A. Bronnikov ◽  
S. V. Bolokhov ◽  
M. V. Skvortsova
Keyword(s):  
Black Hole ◽  
Vacuum Polarization ◽  
Particle Creation ◽  
Energy Tensor ◽  
Quantum Fields ◽  
Stress Energy Tensor ◽  
Planck Length ◽  
Schwarzschild Black Hole ◽  
Stress Energy

We have previously shown that the singularity in a Schwarzschild black hole of stellar or larger mass may be avoided in a semiclassical manner by using as a source of gravity the stress-energy tensor (SET) corresponding to vacuum polarization of quantum fields, with a minimum spherical radius a few orders of magnitude larger than the Planck length. In this note we estimate the nonlocal contribution to the total SET due to particle creation from vacuum. We show that this contribution is negligibly small as compared to vacuum polarization and does not affect the previously suggested scenario.

Quantum fields interacting with colliding plane waves: particle creation

1993 ◽  
Vol 403 (3) ◽  
pp. 770-808 ◽  
Author(s):  
Miquel Dorca ◽  
Enric Verdaguer
Keyword(s):  
Plane Waves ◽  
Particle Creation ◽  
Quantum Fields

Meaning

2017 ◽  
Author(s):  
Richard Healey
Keyword(s):  
Quantum Theory ◽  
Physical Object ◽  
Quantum Fields ◽  
Conceptual Content ◽  
Classical Physics ◽  
Physical Context

Novel quantum concepts acquire content not by representing new beables but through material-inferential relations between claims about them and other claims. Acceptance of quantum theory modifies other concepts in accordance with a pragmatist inferentialist account of how claims acquire content. Quantum theory itself introduces no new beables, but accepting it affects the content of claims about classical magnitudes and other beables unknown to classical physics: the content of a magnitude claim about a physical object is a function of its physical context in a way that eludes standard pragmatics but may be modeled by decoherence. Leggett’s proposed test of macro-realism illustrates this mutation of conceptual content. Quantum fields are not beables but assumables of a quantum theory we use to make claims about particles and non-quantum fields whose denotational content may also be certified by models of decoherence.

scholarly journals A path integral formulation for particle detectors: the Unruh-DeWitt model as a line defect

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Ivan M. Burbano ◽  
T. Rick Perche ◽  
Bruno de S. L. Torres
Keyword(s):  
Path Integral ◽  
Degrees Of Freedom ◽  
Wilson Line ◽  
Transition Probability ◽  
Relativistic Quantum ◽  
Quantum Fields ◽  
Line Defect ◽  
Particle Detectors ◽  
Nonlocal Operators ◽  
Detector Model

Abstract Particle detectors are an ubiquitous tool for probing quantum fields in the context of relativistic quantum information (RQI). We formulate the Unruh-DeWitt (UDW) particle detector model in terms of the path integral formalism. The formulation is able to recover the results of the model in general globally hyperbolic spacetimes and for arbitrary detector trajectories. Integrating out the detector’s degrees of freedom yields a line defect that allows one to express the transition probability in terms of Feynman diagrams. Inspired by the light-matter interaction, we propose a gauge invariant detector model whose associated line defect is related to the derivative of a Wilson line. This is another instance where nonlocal operators in gauge theories can be interpreted as physical probes for quantum fields.

Gårding Domains and Analytic Vectors for Quantum Fields

1972 ◽  
Vol 13 (6) ◽  
pp. 821-827 ◽  
Author(s):  
Gerhard C. Hegerfeldt
Keyword(s):  
Quantum Fields
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