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Quantum field theory — In quantum field theory (QFT) the forces between particles are mediated by other particles. For instance, the electromagnetic force between two electrons is caused by an exchange of photons. But quantum field theory applies to all fundamental… … Wikipedia
Perturbation theory (quantum mechanics) — In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a … Wikipedia
Cosmic string — Not to be confused with string in string theory. Cosmic strings are hypothetical 1 dimensional (spatially) topological defects which may have formed during a symmetry breaking phase transition in the early universe when the topology of the vacuum … Wikipedia
Baryogenesis — Unsolved problems in physics Why does the observable universe have more matter than antimatter? … Wikipedia
Feynman diagram — The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… … Wikipedia
String theory — This article is about the branch of theoretical physics. For other uses, see String theory (disambiguation). String theory … Wikipedia
Perturbation theory — This article describes perturbation theory as a general mathematical method. For perturbation theory as applied to quantum mechanics, see perturbation theory (quantum mechanics). Perturbation theory comprises mathematical methods that are used to … Wikipedia
Kondo effect — According to the Kondo effect, the electrical resistance will diverge as the temperature approaches 0 K. The temperature dependence of the resistance including the Kondo effect is written as: ho(T) = ho 0 + aT^2 + c m lnfrac{mu}{T} + bT^5,where… … Wikipedia
1/N expansion — In quantum field theory and statistical mechanics, the 1/N expansion (also known as the large N expansion) is a particular perturbative analysis of quantum field theories with an internal symmetry group such as SO(N) or SU(N). It consists in… … Wikipedia
Causal dynamical triangulation — Beyond the Standard Model Standard Model … Wikipedia
