Topic

# Anomaly (physics)

About: Anomaly (physics) is a research topic. Over the lifetime, 11487 publications have been published within this topic receiving 212946 citations. The topic is also known as: quantum anomaly.

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TL;DR: In this paper, the cosmological constant problem in the light of dilatation symmetry and its possible anomaly is discussed, and it is shown that the energy-momentum tensor in the vacuum is purely anomalous and that deviations from the standard hot big bang cosmology are possible.

2,385 citations

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TL;DR: In this paper, the cosmological constant problem in the light of dilatation symmetry and its possible anomaly is discussed and a non-trivial "cosmon condition" that the energy-momentum tensor in the vacuum is purely anomalous is given.

Abstract: We discuss the cosmological constant problem in the light of dilatation symmetry and its possible anomaly. For dilatation symmetric quantum theories realistic asymptotic cosmology is obtained provided the effective potential has a non-trivial minimum. For theories with dilatation anomaly one needs as a non-trivial "cosmon condition" that the energy-momentum tensor in the vacuum is purely anomalous. Such a condition is related to the short-distance renormalization group behavior of the fundamental theory. Observable deviations from the standard hot big bang cosmology are possible.

1,842 citations

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TL;DR: In this article, the chiral magnetic effect of topological charge changing transitions in the quark-gluon plasma has been studied and an electromagnetic current is generated along the magnetic field.

Abstract: Topological charge changing transitions can induce chirality in the quark-gluon plasma by the axial anomaly. We study the equilibrium response of the quark-gluon plasma in such a situation to an external magnetic field. To mimic the effect of the topological charge changing transitions we will introduce a chiral chemical potential. We will show that an electromagnetic current is generated along the magnetic field. This is the chiral magnetic effect. We compute the magnitude of this current as a function of magnetic field, chirality, temperature, and baryon chemical potential.

1,821 citations

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TL;DR: A condensed-matter analog of (2+1)-dimensional electrodynamics is constructed in this article, and the consequences of a recently discovered anomaly in such systems are discussed in detail.

Abstract: A condensed-matter analog of (2+1)-dimensional electrodynamics is constructed, and the consequences of a recently discovered anomaly in such systems are discussed.

1,573 citations

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TL;DR: In this paper, it was shown that there is a supergravity contribution to the quantum level of the superconformal anomaly to the A terms proportional to the beta function of the corresponding Yukawa coupling.

Abstract: In models with dynamical supersymmetry breaking in the hidden sector, the gaugino masses in the observable sector have been believed to be extremely suppressed (below 1 keV), unless there is a gauge singlet in the hidden sector with specific couplings to the observable sector gauge multiplets. We point out that there is a pure supergravity contribution to gaugino masses at the quantum level arising from the superconformal anomaly. Our results are valid to all orders in perturbation theory and are related to the ‘exact’ beta functions for soft terms. There is also an anomaly contribution to the A terms proportional to the beta function of the corresponding Yukawa coupling. The gaugino masses are proportional to the corresponding gauge beta functions, and so do not satisfy the usual GUT relations.

1,185 citations