Thermal quantum field theory

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Topic: Thermal quantum field theory

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	Quantum field theory in curved spacetime - Wikipedia, the free encyclopedia
		Probably the most striking application of the theory of quantum fields in curved spacetime is Hawking's prediction that black holes radiate with a thermal spectrum.
		Quantum field theory in curved spacetimes is an extension of the standard quantum field theory to curved spacetimes.
		The theory of quantum field theory in curved spacetime can be considered as a first approximation of the inaccessible theory of quantum gravity.
	en.wikipedia.org /wiki/Quantum_field_theory_in_curved_spacetime (259 words)

	Physics Today February 2004 - Article: Lattice Quantum Chromodynamics Comes of Age
		Quantum chromodynamics is the elegant but notoriously intractable theory of the strong interactions.
		As in classical field theory, the QCD action is the integral, over space and time, of the Lagrangian density.
		By contrast, quantum chromodynamics (QCD), the generally accepted theory of strongly interacting quarks and gluons, has proven to be remarkably resistant to that approach.
	www.physicstoday.org /pt/vol-57/iss-2/p45.html (3125 words)

	Dietrich's Talk at INT
		To arrive at this effective theory one has to integrate out all field modes with momenta larger than g^2 T, which can be done in perturbation theory.
		Suppose the correlation function of interest receives a contribution from soft gauge fields with a typical wavelength of order of the magnetic screening length 1/(g^2 T).
		In this way one takes full advantage of the fact that the field modes which are left in the problem have momenta small compared to the temperature and thus behave classically.
	www.int.washington.edu /SEMINARS/Bodeker (442 words)

	Nonequilibrium Field Theory
		Traditional applications of quantum field theory are restricted mainly to scattering processes and systems in thermal equilibrium.
		Nonequilibrium quantum field theory is necessary to understand initial value problems such as arise in the dynamics of the early universe, heavy-ion collisions, and the dynamics of phase transitions in general.
		Quantum Kinetic Field Theory in Curved Spacetime: Covariant Wigner Function and Liouville-Vlasov Equations, Esteban Calzetta, Salman Habib, and Bei-Lok Hu, Phys.
	t8web.lanl.gov /people/salman/neqft.html (448 words)

	Non-Equilibrium Dynamics in Quantum Field Theory
		Kusnezov and K. Aoki, "Classical lattice field theory under weak and strong thermal gradients"
		Randrup, "Mean Field Treatment of Non-Equilibrium Dynamics in Quantum Field Theory"
		Bodeker, "Effective field theories for non-equilibrium quantum field theory"
	int.phys.washington.edu /SEMINARS/seminars.html (245 words)

	FreeScience - News
		Applications of path integrals are as vast as those of quantum mechanics itself, including the quantum mechanics of a single particle, statistical mechanics, condensed matter physics and quantum field theory.
		We then discuss a variety of applications, including path integrals in multiply-connected spaces, Euclidean path integrals and statistical mechanics, perturbation theory in quantum mechanics and in quantum field theory, and instantons via path integrals.
		Transport in quantum wires 7.1 Conductivity and conductance 7.2 Dissipation in a contactless measurement 7.3 Conductance of a wire attached to reservoirs 7.4 Spin component of the conductance 7.5 Thermal conductance: Fabry-Perrot resonances of plasmons 8.
	freescience.info /news.php?PHPSESSID=6b3783c7f2fecb0d9ece074d2340ff79 (245 words)

	School of Physics: Research=>FACULTY RESEARCH PROFILES
		A theory might be within reach, but it requires every tool in a theorist's toolbox, from numerically intensive solutions of PDEs to quantum field theory to mathematics of zeta functions.
		My area of expertise is the theory of atomic and molecular collision processes, in general, and on recombination processes at thermal and ultra cold energies, in particular.
		Together with my students, I work on reconciling the fundamental concepts and principles of quantum theory and space-time theory.
	www.physics.gatech.edu /research/profile.html (245 words)

	Quantum Reality
		The relativistic nature of quantum field theory in the Feynman diagram and its extension to superstrings and membranes.
		Special relativity and quantum theory combine to provide succinct explanations of force fields, in fact they are the most succinct theories even invented by the human mind, accurate to at least seven decimal places.
		In the classical view energy distribution should increase endlessly into the high frequencies, but in the quantum view, to release a particulate photon of a given frequency, there has to be an atom somewhere with an energized enough electron to radiate the photon, so the energy is limited by the temperature of the thermal body.
	www.dhushara.com /book/quantcos/quant1/quant.htm (5971 words)

	The Tom Bearden Website
		In the quantum field theory view, the classical "isolated charge" is immersed in a seething cluster of virtual photons in the vacuum.
		That free potentialization (change of potential and therefore free change of system potential energy) is absolutely required and permitted by the gauge freedom principle in quantum field theory, which is also used widely in regauging (as, e.g., in the symmetrical regauging by Lorenz and then Lorentz of the Maxwell-Heaviside equations).
		E (the internal energy, or potential energy, or "potential" of the system in EE jargon) is an external parameter, since all EM potentials and fields are, and any change in an external parameter is automatically assumed (in thermal physics) to be work.
	www.cheniere.org /correspondence/021203b.htm (5971 words)

	Don’t understand:
		Using quantum field theory, jibu et al (1994) have proposed that ordering of water molecules and the quantized electromagnetic field confined indside the hollow microtubule core manifest a specific collective dynamics called super-radiance.
		In my theoretical terms (global workspace theory), conscious information is distributed widely in cortex and elsewhere, to facilitate recruitment of unconscious knowledge sources that can work together to identify the input, and to construct a nonroutine action in response to it.
		Consequently microtubule quantum dynamics may be coupled over brain-wide areas, a superposition which could solve the ‘binding problem’ and account for unity of thought and consciousness.
	www2.hawaii.edu /~jjudd/questions/questions.htm (5971 words)

	Physics
		The primary areas of experimental and theoretical research in the Department of Physics are experimental biophysics, physical biology, high-energy particle physics, atomic and molecular physics, the physics of solids and fluids, astrophysics, computational physics, aspects of nuclear physics, statistical mechanics, quantum optics, mathematical physics, quantum field theory, string theory, and relativity.
		The physics department and its collaborators are leaders in a broad spectrum of physics research, utilizing facilities and technologies that are continually being modified and improved with changing research interests and techniques.
		Gerald Holton's chief interests are in the history and philosophy of science, in the physics of matter at high pressure, and in the study of career paths of young scientists.
	www.gsas.harvard.edu /programs/degree/physics.html (7469 words)

	Citebase - Chern-Simons number diffusion in (1+1)-dimensional Higgs theory
		We set up the classical analogue of thermal field theory and make a direct comparison between the quantum and classical diagrams.
		We study time dependent correlation functions in hot quantum and classical field theory for the λφ
		The 1+1 dimensional abelian Higgs model with fermions is a toy model for the theory of electroweak baryogenesis.
	citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:hep-ph/9407241 (1074 words)

	Citebase - Classical Fields Near Thermal Equilibrium
		We discuss the classical limit for the long-distance (``soft'') modes of a quantum field when the hard modes of the field are in thermal equilibrium.
		Using a real time formulation of finite temperature field theory we derive, up to two loops and O(λ
		We propose a formulation of the long-distance dynamics of gauge theories at finite temperature on a lattice in Minkowski space, including the effects of hard thermal loops on the dynamics of the long wavelength modes.
	citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:hep-th/9605048 (1228 words)

	Molecular Dynamics Publications
		M.E.F. Apol, A. Amadei, H.J.C. Berendsen and A. Di Nola, Derivation of thermal equations of state for quantum systems using the quasi-Gaussian entropy theory J.
		Theoretical Equations of State of Temperature and Electromagnetic Field Dependence of Fluid Systems, Based on the Quasi-Gaussian Entropy Theory.
		Exploring the photoactive yellow protein photocycle by combining quantum mechanics and molecular dynamics.
	md.chem.rug.nl /articles.html (1228 words)

	HistCite - index: Albert Einstein 1900-1955
		Svaiter NF Finite size effects in thermal field theory
		Gill TL; Zachary WW Foundations for relativistic quantum theory.
		Jaksic V; Pillet CA Spectral theory of thermal relaxation
	www.garfield.library.upenn.edu /histcomp/einstein-a_all-w-citing-pre-56_e/index-so-74.html (1228 words)

	HISTORY OF PHYSICS: EINSTEIN AND RADIATION
		His 1905 paper on quantization of the radiation field (often referred to, inaccurately, as the photoelectric-effect paper) was built on simple statistical arguments, and in subsequent years he returned repeatedly to questions centered on statistics and thermal fluctuations.
		5) In exasperation, Max Planck (1858-1947) unwittingly and unwillingly gave birth to quantum theory.
		First, he pictured the radiation as being driven by the vibration of oscillators -- atoms and electrons -- in the hot body, with each frequency of vibration corresponding to the presence of a particular color of light in the radiation.
	scienceweek.com /2005/sw050325-5.htm (1228 words)

	Citebase - Quantum Statistical Mechanics of Nonrelativistic Membranes: Crumpling Transition at Finite Temperature
		[19] R. Rivers, Path Integrals in Quantum Field Theory (Cambridge University Press, Cambridge, 1987).
		In contrast to thermal fluctuations, which soften the membrane at large scales and turn it into a crumpled surface, quantum fluctuations are found to {\em stiffen} the membrane, so that it exhibits a Hausdorff dimension equal to two.
		Quantum Statistical Mechanics of Nonrelativistic Membranes: Crumpling Transition at Finite Temperature
	citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:cond-mat/9905241 (1167 words)

	Philosophical Foundations of Physics, Columbia University M.A. Program
		Quantum field theory, relativity, geometric concepts in physics.
		In addition, students submit a written master's thesis which presents original research on some aspect of the foundations or philosophy of physics and which is to be completed under the supervision of a member of the Physics or Philosophy Department at Columbia University.
		The Departments of Philosophy and Physics at Columbia University are now offering a Master of Arts Program in the Philosophical Foundations of Physics.
	www.columbia.edu /cu/philosophy/programs/text/philphys.html (333 words)

	Brazilian Journal of Physics - Elementary particles under the lens of the black holes
		Had we not taken into account the FDU thermal bath, the proton would be seemingly stable according to the co-accelerated observers (for sake of energy conservation) in contradiction with the inertial frame conclusion: The FDU effect is necessary for the consistency of Quantum Field Theory.
		Moreover because the Semiclassical Gravity is in the interface of General Relativity, Quantum Field Theory, and Thermodynamics, unexpected effects which does not have to do directly with Quantum Gravity are being unveiled.
		The overwhelming difficulty of constructing a quantum gravity theory can be illustrated by the fact that different people will give different answers to what such a theory should look like.
	www.scielo.br /scielo.php?script=sci_arttext&pid=S0103-97332004000200005&lng=en&nrm=iso&tlng=en (333 words)

	PHY 532
		Properties of the free quantized electromagnetic field, quantum theory of coherence, squeezed states, theory of photoelectric detection, correlation measurements, atomic resonance fluorescence, cooperative effects, quantum effects in nonlinear optics.
		Quantum counter, black-body radiation, photon statistics, Fock state representation.
		Derivation of p(n,t,t+T), application to particular quantum states, Q parameter for photon counting statistics.
	lists.pas.rochester.edu /temp/mainFrame/education/pages/PHY_532.html (333 words)

	8.5 The Einstein-Langevin equation
		An important quantity not usually obtained in linear response theory, but of equal importance, manifest in the CTP stochastic approach is the noise term arising from the quantum and statistical fluctuations in the thermal field.
		As we have seen before and here, the Einstein-Langevin equation is a dynamical equation governing the dissipative evolution of the gravitational field under the influence of the fluctuations of the quantum field, which, in the case of black holes, takes the form of thermal radiance.
		This equation depicts the stochastic evolution of the perturbations of the black hole under the influence of the fluctuations of the thermal scalar field.
	univie.ac.at /EMIS/journals/LRG/Articles/lrr-2004-3/articlesu22.html (388 words)

	Abstract
		Axiomatic analyticity properties and representations of particles in thermal quantum field theory
		We provide an axiomatic framework for Quantum Field Theory at finite temperature which implies the existence of general analyticity properties of the $ n $-point functions; the latter parallel the properties derived from the usual Wightman axioms in the vacuum representation of Quantum Field Theory.
		Some known examples of ``hard-thermal-loop calculations'' and the representation of ``quasiparticles'' are discussed in this general framework.
	www.lqp.uni-goettingen.de /papers/97/02/97022000.html (388 words)

	Curriculum Vitae of Dr. KHAN Sameen Ahmed KHAN
		The Ph.D programme consisted of regular course over three semesters in Classical Mechanics, Quantum Mechanics, Electromagnetic Theory, Mathematical Physics, Differential Geometry, Group Theory, Statistical & Thermal Physics, Quantum Field Theory, Quantum Optics and Particle Physics.
		The machinery of Lie algebraic methods is used primarily and this facilitates an easy passage from the quantum theory to the traditional classical theory (geometrical optics).
		The application of the spinor beam optical formalism has been shown to lead to a fully quantum mechanical understanding of the dynamics of a spin-half particle with anomalous magnetic moment, including the spin evolution, at the level of single-particle dynamics.
	www.imsc.ernet.in /~jagan/khan-cv.html (388 words)

	Spectroscopy of Consciousness
		The notion of manysheeted spacetime indeed allows these macroscopic quantum states: various ions are 'dropped' from atomic spacetime sheets to cellular spacetime sheets where the thermal noise is absent so that the ions can form superconducting macroscopic quantum phases.
		Magnetically confined states of ions in Earth's magnetic field having minimal size of order cell size and energy scale of order E-14 eV (this corresponds to thermal energy of E-10 K) are in question.
		Macroscopic quantum phases are an essential element of most quantum consciousness theories and topological geometrodynamics (TGD) is not an exception in this respect.
	www.physics.helsinki.fi /~matpitka/abstrac1.html (739 words)

	Sarfatti_14.doc
		The idea here is that orthodox nonlocal micro-quantum theory with irreducible randomness and consequent signal locality is only the sub-quantal thermal equilibrium limit of a more general non-equilibrium local MACRO-QUANTUM theory for cosmology and the emergence of "classical curved space-time" with signal nonlocality.
		Of course local quantum field theories of gravity have many other difficulties, and one might think that the entropy puzzle is simply a reflection of these other difficulties.
		In particular the observed entropy of the universe is vastly smaller than what one would at least naively expect in any local field theory of gravity with innumerable short distance degrees of freedom.
	www.stealthskater.com /Documents/Sarfatti_14.doc (739 words)

	Hawking radiation in a solid-state BH
		On such scales, free field theory is unlikely to be a valid description, and quantum-gravity effects should become important.
		The standard derivations of Hawking's radiation rely on the theory of a free quantized field on curved space-time, and describe the radiation as originating from vacuum fluctuations on scales exponentially smaller than the Planck scale.
		In the absence of a full theory of quantum-gravity, guiding toy models, which are based on the well established physics, can be helpful.
	www.tau.ac.il /~reznik/Main_part/trans-Planckian.htm (235 words)

	Limits
		Distance fluctuations are deduced from quantum fluctuations of metric computed from quantum fluctuations of the gravitational field despite the lack of a complete and consistent quantum theory of gravitation at the present time
		Quantum field fluctuations exert a radiation pressure on a scatterer at rest in vacuum.
		The mechanical action of the vacuum radiation pressure transmits quantum fluctuations to the position on the mirror.
	arachne.spectro.jussieu.fr /Vacuum/English/Limites (630 words)

	Black hole information paradox - Wikipedia, the free encyclopedia
		Basically, his argument assumes the AdS/CFT correspondence which states that an AdS black hole is dual to a thermal conformal field theory, which is unitary.
		Since the 1998 discovery of the AdS/CFT correspondence, the predominant belief among physicists is that information is preserved and that Hawking radiation is not precisely thermal but receives quantum corrections.
		In July 2004 Stephen Hawking announced a theory that quantum perturbations of the event horizon could allow information to escape from a black hole, which would resolve the information paradox.
	en.wikipedia.org /wiki/Black_hole_information_paradox (571 words)

	Zero-point energy - Wikipedia, the free encyclopedia
		The simplest experimental evidence for the existence of zero-point energy in quantum field theory is the Casimir effect.
		In quantum perturbation theory, it is sometimes said that the contribution of one-loop and multi-loop Feynman diagrams to elementary particle propagators are the contribution of vacuum fluctuations or the zero-point energy to the particle masses.
		The average energy of a harmonic oscillator in thermal equilibrium with its surroundings is:
	en.wikipedia.org /wiki/Zero_point_energy (2200 words)

	Calphysics Institute: Introduction to Zero-Point Energy
		This energy is so enormous that most physicists believe that even though zero-point energy seems to be an inescapable consequence of elementary quantum theory, it cannot be physically real, and so is subtracted away in calculations.
		The basis of zero-point energy is the Heisenberg uncertainty principle, one of the fundamental laws of quantum physics.
		E, 48, 1562, 1993) verified that this was not contradictory to the laws of thermodynamics (since the zero-point energy is different from a thermal reservoir of heat).
	www.calphysics.org /zpe.html (1499 words)

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