منابع مشابه
Vacuum Energy and Θ–vacuum
The highly non-trivial structure of the θ–vacuum encodes many of the fundamental properties of gauge theories. In particular, the response of the vacuum to the θ–term perturbation is sensitive to the existence of confinement, chiral symmetry breaking, etc. We analyze the dependence of the vacuum energy density on θ around two special values, θ = 0 and θ = π. The existence or not of singular beh...
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The anomalous moment of the muon is one of the most fundamental observables. It has been measured experimentally with a very high precision and on theory side the contributions from perturbative QED have been calculated up to five-loop level by numerical methods. Contributions to the muon anomalous magnetic moment from certain diagram classes are also accessible by alternative methods. In this ...
متن کامل3 Possibilities of a QED - Based Vacuum Energy
A QED-based bootstrap mechanism, appearing at sufficiently small space-time scales, is suggested as an explanation for the " dark " vacuum energy that may be able to accelerate the universe. Very-small-scale virtual vacuum currents are assumed to generate small-scale electromagnetic fields, corresponding to the appearance of an effective 4-potential A ext µ (x), which is itself equal to the vev...
متن کاملBirefringence and Dichroism of the QED Vacuum
In the presence of a strong external field, the vacuum reacts, becoming magnetized and polarized. The index of refraction, magnetic permeability, and dielectric constant of the vacuum are straightforward to calculate using quantum electrodynamic one-loop corrections [1–6]. In this paper, we calculate the magnetic permeability and dielectric tensors of an external electric or magnetic field of a...
متن کاملSONOLUMINESCENCE AND THE QED VACUUM a
In this talk I shall describe an extension of the quantum-vacuum approach to sono-luminescence proposed several years ago by J. Schwinger. We shall first consider a model calculation based on Bogolubov coefficients relating the QED vacuum in the presence of an expanded bubble to that in the presence of a collapsed bubble. In this way we shall derive an estimate for the spectrum and total energy...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2013
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-013-2642-0