scholarly journals Local quasiequivalence and adiabatic vacuum states

1990 ◽  
Vol 134 (1) ◽  
pp. 29-63 ◽  
Author(s):  
Christian Lüders ◽  
John E. Roberts
Keyword(s):  
Vacuum States ◽  
Adiabatic Vacuum

HADAMARD STATES, ADIABATIC VACUA AND THE CONSTRUCTION OF PHYSICAL STATES FOR SCALAR QUANTUM FIELDS ON CURVED SPACETIME

1996 ◽  
Vol 08 (08) ◽  
pp. 1091-1159 ◽  
Author(s):  
WOLFGANG JUNKER
Keyword(s):  
Pseudodifferential Operators ◽  
Cauchy Surface ◽  
Positive Energy ◽  
Hyperbolic Spacetime ◽  
Vacuum States ◽  
Mathematical Review ◽  
Scalar Quantum ◽  
Klein Gordon ◽  
Hadamard States ◽  
Adiabatic Vacuum

Quasifree states of a linear Klein-Gordon quantum field on globally hyperbolic spacetime manifolds are considered. After a short mathematical review techniques from the theory of pseudodifferential operators and wavefront sets on manifolds are used to develop a criterion for a state to be an Hadamard state. It is proven that ground- and KMS-states on certain static spacetimes and adiabatic vacuum states on Robertson-Walker spaces are Hadamard states. A counterexample is given which shows that the idea of instantaneous positive energy states w.r.t. a Cauchy surface does in general not yield physical states. Finally, the problem of constructing Hadamard states on arbitrary curved spacetimes is solved in principle.

scholarly journals Adiabatic Vacuum States on General Spacetime Manifolds: Definition, Construction, and Physical Properties

2002 ◽  
Vol 3 (6) ◽  
pp. 1113-1181 ◽  
Author(s):  
W. Junker ◽  
E. Schrohe
Keyword(s):  
Physical Properties ◽  
Vacuum States ◽  
Adiabatic Vacuum

scholarly journals Covariant phase space and soft factorization in non-Abelian gauge theories

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Temple He ◽  
Prahar Mitra
Keyword(s):  
Phase Space ◽  
Ward Identity ◽  
Gauge Theories ◽  
Minkowski Spacetime ◽  
Soft Gluon ◽  
Careful Study ◽  
Abelian Gauge ◽  
Gauge Sector ◽  
Vacuum States ◽  
The One

Abstract We perform a careful study of the infrared sector of massless non-abelian gauge theories in four-dimensional Minkowski spacetime using the covariant phase space formalism, taking into account the boundary contributions arising from the gauge sector of the theory. Upon quantization, we show that the boundary contributions lead to an infinite degeneracy of the vacua. The Hilbert space of the vacuum sector is not only shown to be remarkably simple, but also universal. We derive a Ward identity that relates the n-point amplitude between two generic in- and out-vacuum states to the one computed in standard QFT. In addition, we demonstrate that the familiar single soft gluon theorem and multiple consecutive soft gluon theorem are consequences of the Ward identity.

Quantum optical interferometry via the mixing of coherent and photon-subtracted squeezed vacuum states of light

2014 ◽  
Vol 31 (3) ◽  
pp. 586 ◽  
Author(s):  
Richard Birrittella ◽  
Christopher C. Gerry
Keyword(s):  
Optical Interferometry ◽  
Squeezed Vacuum ◽  
Vacuum States ◽  
Quantum Optical

Generation of Squeezed Vacuum States via Polarization Self-Rotation

2009 ◽  
Author(s):  
G. Campbell ◽  
C. Healey ◽  
J. Appel ◽  
K.-P. Marzlin ◽  
A. I. Lvovsky ◽  
...  
Keyword(s):  
Squeezed Vacuum ◽  
Vacuum States

Kt3 form factors,F K/F π and the symmetry-breaking parameter of the vacuum states

1970 ◽  
Vol 70 (4) ◽  
pp. 549-563
Author(s):  
C. S. Lai ◽  
H. E. Lin ◽  
W. C. Lin
Keyword(s):  
Symmetry Breaking ◽  
Form Factors ◽  
Vacuum States ◽  
Breaking Parameter

Liquid State Polydimethylsiloxane (PDMS) Wrinkle Formation Process for Various Applications.

2010 ◽  
Vol 1272 ◽  
Author(s):  
Sang Hoon Lee ◽  
Jangbae Jeon ◽  
Sang Ho Lee ◽  
Moon J. Kim
Keyword(s):  
Thin Film ◽  
Formation Process ◽  
Liquid State ◽  
Metal Particles ◽  
Film Electrode ◽  
Biological Applications ◽  
Vacuum Plasma ◽  
Vacuum States ◽  
Flexible Metal ◽  
Deposition Conditions

AbstractHere we report an epoch-making simple fabrication for wrinkle formation. The present wrinkle formation process is a solution for controlling the area, shape and direction of wrinkle area by forming wrinkles on the liquid state polydimethylsiloxane directly exposed to sputtered metal particles in the low vacuum plasma chamber in various vacuum states and deposition conditions. Also the process allows us to make extremely flexible metal thin film electrode with approved adhesion. These bring us possibilities of actual electrical and biological applications.

scholarly journals Bounding f(R) gravity by particle production rate

2016 ◽  
Vol 25 (04) ◽  
pp. 1630010 ◽  
Author(s):  
Salvatore Capozziello ◽  
Orlando Luongo ◽  
Mariacristina Paolella
Keyword(s):  
Field Theory ◽  
Particle Production ◽  
High Redshift ◽  
Dark Side ◽  
Quantum Field ◽  
Quantum Vacuum ◽  
Vacuum States ◽  
Text Model ◽  
Free Parameters ◽  
The Given

Several models of [Formula: see text] gravity have been proposed in order to address the dark side problem in cosmology. However, these models should be constrained also at ultraviolet scales in order to achieve some correct fundamental interpretation. Here, we analyze this possibility comparing quantum vacuum states in given [Formula: see text] cosmological backgrounds. Specifically, we compare the Bogolubov transformations associated to different vacuum states for some [Formula: see text] models. The procedure consists in fixing the [Formula: see text] free parameters by requiring that the Bogolubov coefficients can be correspondingly minimized to be in agreement with both high redshift observations and quantum field theory predictions. In such a way, the particle production is related to the value of the Hubble parameter and then to the given [Formula: see text] model. The approach is developed in both metric and Palatini formalism.

scholarly journals Multiphoton nonclassical correlations in entangled squeezed vacuum states

2013 ◽  
Vol 87 (3) ◽  
Author(s):  
Bhaskar Kanseri ◽  
Timur Iskhakov ◽  
Georgy Rytikov ◽  
Maria Chekhova ◽  
Gerd Leuchs
Keyword(s):  
Squeezed Vacuum ◽  
Vacuum States

Slater Determinants and Quasiparticle Vacuum States Constructed from a Finite Number of Fermion States

1969 ◽  
Vol 177 (4) ◽  
pp. 1514-1518 ◽  
Author(s):  
A. M. Navon ◽  
A. K. Bose
Keyword(s):  
Finite Number ◽  
Vacuum States
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