[Todos] Recordatorio seminario IFLP/Dto Fisica - hoy 12:30hs

[Maria Virginia Manias]

*SEMINARIOS  DEL IFLP y DEL DEPARTAMENTO*

*Día y horario especiales*

*LUNES 22 de MAYO – 12:30 hs*

*AULA CHICA*


*TÍTULO**: **"Parity anomaly in four dimensions"*



*EXPOSITOR:* *Dmitry Vassilevich*

*Tomsk State University & Universidade Federal do ABC*


*Resumen:* It is known for more than 30 years that quantum Dirac fermions
in odd dimensional spaces possess the so called parity anomaly related to
the spectral asymmetry of the Dirac operator. As a result, the Chern-Simons
action with the level k=1/2 is induced in 3D. We have studied Dirac
fermions on four-dimensional manifolds with boundaries and demonstrated
that a similar phenomenon takes place: spectral asymetry of the Dirac
operator leads to a boundary Chern-Simons term. We found a somewhat unusual
Chern-Simons level k=1/4, which is however consistent with the counting of
boundary degrees of freedom.
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