English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We continue the study of model-independent constraints on the unitaryConformal Field Theories in 4-Dimensions, initiated in arXiv:0807.0004. Ourmain result is an improved upper bound on the dimension \Delta of the leadingscalar operator appearing in the OPE of two identical scalars of dimension d.In the interval 1<d<1.7 this universal bound takes the form\Delta<2+0.7(d-1)^{1/2}+2.1(d-1)+0.43(d-1)^{3/2}. The proof is based on primeprinciples of CFT: unitarity, crossing symmetry, OPE, and conformal blockdecomposition. We also discuss possible applications to particle phenomenologyand, via a 2-D analogue, to string theory.

Universal Constraints on Conformal Operator Dimensions