5. Theoretical Physics (CSN4)

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

by Dr Aram Saharian (Yerevan State University)

Aula Seminari (LNF)

Aula Seminari


Via Enrico Fermi, 40 00044 Frascati (Roma)
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.
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