SciPost logo

General properties of multiscalar RG Flows in $d=4-\varepsilon$

Slava Rychkov, Andreas Stergiou

SciPost Phys. 6, 008 (2019) · published 17 January 2019

Abstract

Fixed points of scalar field theories with quartic interactions in $d=4-\varepsilon$ dimensions are considered in full generality. For such theories it is known that there exists a scalar function $A$ of the couplings through which the leading-order beta-function can be expressed as a gradient. It is here proved that the fixed-point value of $A$ is bounded from below by a simple expression linear in the dimension of the vector order parameter, $N$. Saturation of the bound requires a marginal deformation, and is shown to arise when fixed points with the same global symmetry coincide in coupling space. Several general results about scalar CFTs are discussed, and a review of known fixed points is given.

Cited by 40

Crossref Cited-by

Ontology / Topics

See full Ontology or Topics database.

Conformal field theory (CFT)

Authors / Affiliations: mappings to Contributors and Organizations

See all Organizations.
Funders for the research work leading to this publication