Abstract
We study the QCD vacuum structure under the influence of an electromagnetic field with a nonzero second Lorentz invariant I2=E⋅B. We show that the presence of I2 can induce neutral pion (π0) condensation in the QCD vacuum through the electromagnetic triangle anomaly. Within the frameworks of chiral perturbation theory at leading small-momenta expansion as well as the Nambu–Jona-Lasinio model at leading 1/Nc expansion, we quantify the dependence of the π0 condensate on I2. The stability of the π0-condensed vacuum against the Schwinger charged pair production due to electric field is also discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
