5. Theoretical Physics (CSN4)

Combined quantum effects from topology and boundaries in the cosmic string spacetime

Name: Combined quantum effects from topology and boundaries in the cosmic string spacetime
Start: 2012-07-06T14:30:00+02:00
End: 2012-07-06T16:00:00+02:00
Location: LNF

by Dr Aram Saharian (Yerevan State University)

Friday 6 Jul 2012, 14:30 → 16:00 Europe/Rome

Aula Seminari (LNF)

Aula Seminari

LNF

Via Enrico Fermi, 40 00044 Frascati (Roma)

Description

Quantum vacuum effects are described for scalar, fermionic and electromagnetic fields in the geometry of a straight cosmic string in the presence of reflecting boundaries. At large distances from the string core, the geometry is described by the flat line-element with planar angle deficit. Both the non-trivial topology and boundaries modify the spectrum for vacuum fluctuations of quantum fields. As a result the vacuum expectation values of bilinear combinations of fields are changed. As such combinations we consider the field squared, fermionic condensate and the energy-momentum tensor. Applications to graphene nanocones are given within the framework of the Dirac model for electrons in the graphene sheet.