Novel phase in SU(3) lattice gauge theories with many light fermions

Details Novel phase in SU(3) lattice gauge theories with many light fermions Novel phase in SU(3) lattice gauge theories with many light fermions

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprj14001s&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #J14.001

Physics

Scientific paper

Our ongoing lattice studies of SU(3) gauge theories with Nf=8 and 12 fundamental fermions recently resulted in the observation of unexpected phase structures. For small fermion masses, both systems possess two distinct transitions at finite temperature. The Nf=12 finite-temperature transitions converge to two well-separated bulk phase transitions at zero temperature, consistent with an IR-conformal phase at weak coupling. Preliminary studies suggest that similar convergence to bulk transitions occurs for Nf=8. For both systems, the novel phase between the two transitions is confining but has a very small, possibly vanishing, chiral condensate. The meson spectrum also shows unusual properties in this phase. Our results appear consistent with a scenario in which this phase is chirally broken by a higher-order (four-fermion) condensate.

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