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We found the contribution to the vacuum expectation value of theenergy-momentum tensor of a massive Dirac field due to the conical geometry ofthe cosmic string space-time. The heat kernel and heat kernel expansion for thesquared Dirac operator in this background are also considered and the firstthree coefficients were found in an explicity form.Comment: 9 pages, 1 figure (2 ref added) (enlarged version

The vacuum expectation value of the spinor massive field in the cosmic string spacetime