Resumo:
This work investigates the vacuum fluctuations of a massless scalar field in the presence
of a cylindrical boundary in the spacetime of a spinning cosmic string. The boundary condition
serves to shield the causal region from the acausal one, with the aim of computing
the two-point function and the vacuum fluctuations of the field. First, a brief review of
scalar field quantization is presented, along with a discussion of propagators in quantum
field theory, in which the procedure for calculating vacuum fluctuations is defined. Next,
the renormalized two-point function is obtained, and from it the vacuum fluctuations are
computed using the point-splitting method. Finally, the main results in the literature
regarding cosmic strings and their impact on field fluctuations are recovered.
