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Topic: Field theory (physics)

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 unified field theory --  Encyclopædia Britannica   (Site not responding. Last check: 2007-11-04)
The theory arises from the attempt to combine the principles of quantum mechanics with those of relativity in an effort to describe processes such as high-energy collisions in which particles may be created or destroyed.
In a gauge theory there is a group of transformations of the field variables (gauge transformations) that leaves the basic physics of the quantum field...
Astrophysics is a branch of astronomy that is primarily concerned with the physical properties and structures of cosmic objects.
www.britannica.com /eb/article-9074254   (725 words)

 Quantum field theory - Open Encyclopedia   (Site not responding. Last check: 2007-11-04)
In particular, the quantum theory of the electromagnetic field, known as quantum electrodynamics, is one of the most well-tested and successful theories in physics.
The fundamentals of quantum field theory were developed between the late 1920s and the 1950s, notably by Dirac, Fock, Pauli, Tomonaga, Schwinger, Feynman, and Dyson.
The procedure by which quantum fields are constructed from individual particles was introduced by Dirac, and is (for historical reasons) known as second quantization.
open-encyclopedia.com /Quantum_field_theory   (2369 words)

 Field theory (physics) - Wikipedia, the free encyclopedia
There are two types of field theory in physics:
Classical field theory, the theory and dynamics of classical fields.
Quantum field theory, the theory of quantum mechanical fields.
en.wikipedia.org /wiki/Field_theory_(physics)   (62 words)

 AllRefer.com - quantum field theory (Physics) - Encyclopedia
quantum field theory, study of the quantum mechanical interaction of elementary particles and fields.
Quantum field theory applied to the understanding of electromagnetism is called quantum electrodynamics (QED), and it has proved spectacularly successful in describing the interaction of light with matter.
Quantum field theory applied to the understanding of the strong interactions between quarks and between protons, neutrons, and other baryons and mesons is called quantum chromodynamics (QCD); QCD has a mathematical structure similar to that of QED.
reference.allrefer.com /encyclopedia/Q/quantumf.html   (240 words)

 Relativity and Quantum Theory
However, this theory is inherently a many-body theory with the quanta of the normal modes of the classical field having all the properties of physical particles.
The most successful numerical approach to quantum field theory begins with a formulation of quantum mechanics developed by Feynman in which a quantum amplitude is described as a weighted integral over all possible paths (not necessarily obeying the classical equations) which start at the system's initial state and end at the final state.
The field theory analogue of the single-particle action given in the equation above is a similar polynomial in the field variables and their derivatives, integrated over space-time.
phys.columbia.edu /~cqft/physics.htm   (1637 words)

Field theory in its various forms (classical, quantum, finite-temperature, conformal, topological) is a powerful mathematical tool that can provide solutions to physical problems in areas as diverse as the interactions of elementary particles, the birth of the universe, and microelectronics.
Field theory in all its glory, there are numerous shortcomings of the present models.
In models of particle physics, phase transitions are necessary in order to explain how some elementary particles, such as the W boson, could receive its mass and yet not introduce devastating mathematical infinities (such as 1 divided by 0) in the quantum field theory.
www.damtp.cam.ac.uk /user/hep/public.html   (1878 words)

 Theoretical Elementary Particle Physics - Chicago
The Particle Theory Group at the University of Chicago, part of the Enrico Fermi Institute, carries out research on a wide range of theoretical topics in formal and phenomenological particle physics, including field theory, string theory, supersymmetry, the standard model, cosmology, and mathematical physics.
With string theory, and with field theories on non-commutative spaces, there are now more explicit models, and we are studying their implications.
Two of the most relevant open questions in particle physics are the ones related to the origin of mass and to the existence of a unified theory of all known elementary particle interactions.
physics.uchicago.edu /t_part.html   (3097 words)

 Field theory - Wikipedia, the free encyclopedia
Field theory (mathematics), the theory of the algebraic concept of field.
Field theory (physics), a physical theory which employs fields in the physical sense.
This is a disambiguation page — a list of articles associated with the same title.
en.wikipedia.org /wiki/Field_theory   (88 words)

 IPAM Conformal Field Theory Program
Methods of quantum field theory may be applied to problems of topological invariants of knots and instanton moduli spaces as well and have led to a wealth of new results in pure mathematics.
Their purely algebraic formulation elevates two-dimensional conformal field theories to some of the rare examples where quantum field theories may be defined and constructed in a mathematically rigorous fashion.
The perturbative expansion of string theory in powers of the coupling constant may be formulated in terms of conformal field theories on families of two-dimensional compact Riemann surfaces, whose genus is the order of the expansion.
www.ipam.ucla.edu /programs/cft2001   (1082 words)

 Home Page of Physics 583
Quantum Field Theory is the tool as well as the language that has been developed to describe the physics of problems in such apparently dissimilar fields.
Physics 583, formerly Physics 485, is the second half of a two-semester sequence of courses in Quantum Field Theory.
Vortices and monopoles in scalar theories and in gauge theories.
w3.physics.uiuc.edu /~efradkin/phys583/physics583.html   (1603 words)

 Annotated Physics Encyclopædia: Quantum Field Theory
A Course of Field Theory from Univ of Leiden, 140 pp, with problems, 1.5Mb ps file (lectures), 0.5 Mb ps file (problems).
Quantum Field Theory program at IAS - a large number of lectures covering advanced and subtle issues of QFT; mainly in ps files.
Conformal field theory: a case study - (hep-th/9904145), introduction to Wess-Zumino-Witten model of 2D conformal field theory.
web.mit.edu /afs/athena.mit.edu/user/r/e/redingtn/www/netadv/qft.html   (217 words)

 quantum field theory --  Encyclopædia Britannica   (Site not responding. Last check: 2007-11-04)
The theory arises from the attempt to combine the principles of quantum mechanics with those of relativity in an effort to describe processes such as high-energy collisions in which particles may be created or…
The ligand field theory deals with the origins and consequences of metal– ligand interactions as a means of...
class of quantum field theory used to describe subatomic particles and their associated relativistic quantum fields; all measurable physical properties remain unchanged when certain mathematical symmetry operations are performed on the quantum fields; believed that the final unification of the four fundamental interactions—gravitational, electromagnetic, strong, and...
www.britannica.com /eb/article-9062164   (794 words)

Physics is basically a few laws and a prodigious amount of math to understand their implications.
I can say that for classical physics at the level of high-school or college, the physical laws haven't changed, and neither have the learning tasks.
As with quantum field theory, I'm a bit worried the official story will have changed from the time I bought the text until the time I read it.
www.seanet.com /~hgg9140/physics   (1166 words)

 Quantum Field Theory   (Site not responding. Last check: 2007-11-04)
DC MetaData for: From Euclidean Field Theory to Quantum Field Theory...
Quantum Field Theory (Nair)-Springer Elementary Particles, Quantum Field Theory...
Quantum field theory on curved spacetime at the Erwin Schrödinger Institute...
www.scienceoxygen.com /phys/247.html   (227 words)

 Physics - Wikibooks
Physics with transforms - new invention - a new mnemonic for learning classical physics formulas using Euclidean geometry.
Interpretations of quantum mechanics and quantum field theory
Introductory Physics by Charles Edward Pax, published under the GNU General Public License (GPL).
en.wikibooks.org /wiki/Physics   (350 words)

 Physics - field theory in relationship to spirituality
Field Theory gave rise to the concept of a universe filled with fields that create forces that interact with each other, a view now widely accepted by mainstream science.
'Field Theory' provides a scientific framework to begin to recognise and accept as 'real' the phenomena experienced by most humans, that being the ability to sense the presence and 'vibes' of other people (living or dead) and places, and the ability of some people actually to pick up the thoughts of other people.
The document, 'Physics Field Theory' is the copyright © of the author, Alex Paterson.
www.vision.net.au /~apaterson/science/physics_field.htm   (315 words)

 Bookworkz:: Quantum Field Theory, Revised Edition
Quantum Field Theory Revised Edition F. Mandl and G. Shaw, Department of Theoretical Physics, The Schuster Laboratory, The University, Manchester, UK When this book first appeared in 1984, only a handful of W± and Z° bosons had been observed and the experimental investigation of high energy electro-weak interactions was in its infancy.
The three main objectives are to explain the basic physics and formalism of quantum field theory, to make the reader fully proficient in theory calculations using Feynman diagrams, and to introduce the reader to gauge theories, which play such a central role in elementary particle physics.
The theory is applied to quantum electrodynamics (QED), where quantum field theory had its early triumphs, and to weak interactions where the standard electro-weak theory has had many impressive successes.
www.bookworkz.com /education/physics/0471941867.html   (418 words)

 Phy 341: Quantum Field Theory I
This is an introduction to quantum field theory.
Quantum field theory is an indispensable tool for the study particle, nuclear and condensed matter physics and has applications to an even broader range of physical systems.
The goal of this course is to introduce the basic concepts of quantum field theory.
www.phy.duke.edu /~mehen/341   (326 words)

 ipedia.com: Quantum field theory Article   (Site not responding. Last check: 2007-11-04)
Quantum field theory (QFT) is the application of quantum mechanics to fieldss.
In quantum field theories, Hamiltonians are written in terms of either the creation and annihilation operators or, equivalently, the field operators.
The classic results gained from the axiomatic approach are the PCT Theorem (stating that the combination of parity, time and charge inversion is an unbroken symmetry) and the Spin Statistics Theorem (stating that particles of integer valued spin follow the Bose-Einstein statistics and particles of half-integer spin follow the Fermi statistics).
www.ipedia.com /quantum_field_theory.html   (1114 words)

 Physics and Astronomy Forums - Unified Field Theory
In some of my earlier discussions here, we spoke a wee bit about Unified Field Theory and I'm wondering if there are people willing to discuss its outcomes, relevance and features in modern day physics and how, in future, it may affect the teaching of classical (newtonian) physics, mechanics and electrodynamics.
-- 03-21-2004 @ 11:52 PM Unfied Field Theory is the 'Holy Grail' of physics and thus worthy of discussion...
When I first started reading physics, the proton was a elementary particle until we learned it was composed up of three quarks.
www.physlink.com /Community/Forums/printthread.cfm?Forum=17&Topic=2412   (462 words)

 Gauge Field Theory   (Site not responding. Last check: 2007-11-04)
The course is an introduction to the gauge field theories of modern Particle Physics.
Relativistic quantum fields (4 lectures): Classical field theory; electromagnetic waves; Klein-Gordon field; Fourier analysis; second quantization; single-particle and two-particle states; number operator; quantizing the electromagnetic field; vacuum energy and normal ordering; the Casimir effect; complex fields; symmetries and conservation laws; Noether's theorem; phase (gauge) invariance; Dirac field; spin-statistics theorem.
Gauge theory of electroweak interactions (3 lectures): Gauge symmetry in QED; non-Abelian gauge symmetry; weak interactions; electroweak interactions; Higgs mechanism; parameters of the Standard Model; spontaneous symmetry breaking; properties of the Higgs boson.
www.hep.phy.cam.ac.uk /theory/webber/GFT   (347 words)

 PhilSci Archive - Subject: Quantum Field Theory
Brading, Katherine A. and Castellani, Elena (2002) Symmetries in physics: philosophical reflections.
Dieks, Dennis (2002) Events and covariance in the interpretation of quantum field theory.
Wallace, David M W (2001) In defence of naivete: The conceptual status of Lagrangian quantum field theory.
philsci-archive.pitt.edu /view/subjects/quantum-field-theory.html   (827 words)

 Amazon.com: Quantum Field Theory (International Series in Pure and Applied Physics): Books: Claude Itzykson   (Site not responding. Last check: 2007-11-04)
The discussion on charged scalar fields, and why they are needed to formulate a (scalar) theory of particles and antiparticles.
The existence of a bound state in quantum field theory has yet to be proven using these equations, but they supposedly hold the answer to this existence.
This is a must read for anyone wishing to study field theory beyond the basics and obtain a mastery of the subject.
www.amazon.com /exec/obidos/tg/detail/-/0070320713?v=glance   (1436 words)

 The Enterprise Mission - Hubble's New Runaway Planet - Part I
With NASA's recent announcement of the potential discovery of the first "extrasolar, Jovian-class planet" physically detected beyond the confines of our solar system, the timing seemed particularly appropriate to update our original description of "hyperdimensional physics" at the United Nations, in 1992.
The cornerstone of the hyperdimensional model (as applied to the problem of "unexplained" astrophysical energy sources) is that historically, there is a perfectly natural explanation for such "anomalous energy" appearing in celestial bodies...
It is obvious from Maxwell's own writings that, even before Hathaway's formalization, his choice of quaternions as mathematical operators for his electromagnetic theory was based on his belief that three-dimensional physical phenomena (including even perhaps the basis of human consciousness itself) are dependent upon higher dimensional realities.
www.enterprisemission.com /hyper1.html   (1879 words)

 AIAS: Alpha Foundation Institute for Advanced Study
The main topics of contemporary physics are covered in individual chapters, which also describe the conditions under which ECE theory reduces to Einstein Hilbert (EH) theory, and to Maxwell Heaviside field theory in classical electrodynamics.
It is therefore shown that ECE field theory provides, for the first time, a structure for the objective unification of field theory in natural philosophy.
New fundamantal properties in photon physics are thus due to Evans, such as the Evans-Vigier longitudinal magnetic field component in the direction of propagation of the photon, and an associated small but nonzero photon rest mass.
www.aias.us   (2471 words)

 quantum field theory and number theory   (Site not responding. Last check: 2007-11-04)
My results...led to the conclusion that Feynman diagrams obtained from a field theory in even dimensions all evaluate to the same number-class up to the seven-loop level, the limit of computational ability at this time, although we believe this result to be true in general.
A new approach based on recurrence relations and Quantum Field Theory methods is applied to the simply-laced and quasi-simply-laced subsets of the reflexive numbers.
In the case of N=4 theories U-duality inequivalent backgrounds with the same horizon area are counted by the class number of a quadratic imaginary field.
www.maths.ex.ac.uk /~mwatkins/zeta/QFT.htm   (4749 words)

 Quantum Field Theory   (Site not responding. Last check: 2007-11-04)
Nonequilibrium field theory covers a variety of topics such as transport theory of quantum fields, nonequilibrium phase transitions, the nucleation and transport of topological defects and other nonlinear coherent structures, as well as fundamenta
Zero-point fluctuations in quantum fields give rise to observable forces between material bodies, the so-called Casimir forces.These lectures present the theory of the Casimir effect, primarily formulated in terms of Green's functions.
A non-technical introduction to the renormalization of quantum field theories.
www.canadiancontent.net /dir/Top/Science/Physics/Quantum_Mechanics/Quantum_Field_Theory   (542 words)

 NUCLEAR PHYSICS WITH EFFECTIVE FIELD THEORY II   (Site not responding. Last check: 2007-11-04)
NUCLEAR PHYSICS WITH EFFECTIVE FIELD THEORY II Proceedings from the Institute for Nuclear Theory - Vol.
The method of effective field theory (EFT) is ideally suited to deal with physical systems containing separate energy scales.
Much progress has been made recently in this field: a number of observables in the two-nucleon sector were computed and compared to experiment, issues related to the extension of the EFT program to the three-nucleon sector were clarified, and the convergence of the low energy expansion was critically examined.
www.worldscibooks.com /physics/4312.htm   (366 words)

 Amazon.co.uk: An Introduction to Quantum Field Theory (Frontiers in Physics): Books   (Site not responding. Last check: 2007-11-04)
After presenting the basics of quantum electrodynamics, the authors discuss the theory of renormalization and its relation to statistical mechanics, and introduce the renormalization group.
This discussion sets the stage for a discussion of the physical principles that underlie the fundamental interactions of elementary particle physics and their description by gauge field theories.
This is a good introduction to quantum field theory, suitable for an undergraduate or advanced high school course.
www.amazon.co.uk /exec/obidos/ASIN/0201503972   (687 words)

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