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 calculate the two-loop effective potential of the non-local NJL modelderived from the Sakai-Sugimoto model in string theory. In contrast toconventional NJL with 4-fermion contact interaction, the chiral symmetry waspreviously found to be dynamically broken for arbitrary weak coupling at theone-loop level. As a confirmation, the approximate numerical solutions to thegap equation at one loop are explicitly demonstrated for weak couplings. Wethen calculate the one and two-loop contribution to the effective potential ofthe non-local NJL model and found that the two-loop contribution is negative.The two-loop potential for the chiral symmetric vacuum is also negative butlarger than the combined effective potential of the chiral broken vacuum at thetwo-loop level. The chiral symmetry breaking thus persists for arbitrary weakcoupling at the two-loop level.

Chiral symmetry breaking from two-loop effective potential of the holographic non-local NJL model