SEMICLASSICAL GRAVITATIONAL EFFECTS NEAR COSMIC STRINGS
19874 pages
Published in:
- Phys.Lett.B 188 (1987) 317-320
- Published: 1987
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Abstract: (Elsevier)
The vacuum expectation value of the stress-energy tensor of an arbitrary collection of conformal massless free quantum fields (scalar, spinor, and vector) in the presence of a static, cylindrically symmetric cosmic string is found, up to an undetermined numerical constant. This quantum stress-energy tensor is then used as a source in the linearized semiclassical Einstein equations, which are solved to find the first-order (in Ł) corrections to the exterior metric of a static, cylindrically symmetric cosmic string. The main result is that, at first-order in Ł, the ( r , ø) two-space is no longer a simple flat cone; to this order the ( r , ø) two- space is a (linearized) hyperboloid, which asymptotically approaches the classical conical surface at large values of r . The asymptotic value of the deficit angle of the cone is unchanged, still being precisely 8 πμ .- QUANTUM GRAVITY
- APPROXIMATION: semiclassical
- TENSOR: ENERGY-MOMENTUM
- MODEL: STRING
- Einstein equation
- FIELD EQUATIONS: SOLUTION
- PERTURBATION THEORY
- FIELD THEORY: SPACE-TIME
- FIELD THEORY: SCALAR
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