Search results for "QED vacuum"

showing 2 items of 2 documents

Vacuum polarization around stars: Nonlocal approximation

2004

We compute the vacuum polarization associated with quantum massless fields around stars with spherical symmetry. The nonlocal contribution to the vacuum polarization is dominant in the weak field limit, and induces quantum corrections to the exterior metric that depend on the inner structure of the star. It also violates the null energy conditions. We argue that similar results also hold in the low energy limit of quantum gravity. Previous calculations of the vacuum polarization in spherically symmetric spacetimes, based on local approximations, are not adequate for newtonian stars.

PhysicsNuclear and High Energy PhysicsQED vacuumQuantum field theory in curved spacetimeVacuum stateFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)General Relativity and Quantum CosmologySymmetry (physics)General Relativity and Quantum CosmologyStarsQuantum mechanicsQuantum electrodynamicsQuantum gravityVacuum polarizationCircular symmetryPhysical Review D
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NON-PERTURBATIVE VACUUM WAVE-FUNCTIONAL AND CLOSED STRING EQUATIONS OF MOTION

1989

The anomalous conformal dependence of the vacuum wave-functional is studied in the non-perturbative regime of the closed bosonic string theory. It is shown that the vanishing of the vacuum expectation value of the stress-energy tensor trace leads to the implementation of a suitable variational condition on the wave-functional, provided that the dilaton condensate be taken as a conformal compensator for the graviton condensate of the embedding space.

PhysicsNuclear and High Energy PhysicsQED vacuumBosonic string theoryGravitonGeneral Physics and AstronomyAstronomy and AstrophysicsString field theoryGeneral Relativity and Quantum CosmologyNon-critical string theoryClassical mechanicsString cosmologyDilatonVacuum expectation valueModern Physics Letters A
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