3 research outputs found
External Fields as a Probe for Fundamental Physics
Quantum vacuum experiments are becoming a flexible tool for investigating
fundamental physics. They are particularly powerful for searching for new light
but weakly interacting degrees of freedom and are thus complementary to
accelerator-driven experiments. I review recent developments in this field,
focusing on optical experiments in strong electromagnetic fields. In order to
characterize potential optical signatures, I discuss various low-energy
effective actions which parameterize the interaction of particle-physics
candidates with optical photons and external electromagnetic fields.
Experiments with an electromagnetized quantum vacuum and optical probes do not
only have the potential to collect evidence for new physics, but
special-purpose setups can also distinguish between different particle-physics
scenarios and extract information about underlying microscopic properties.Comment: 12 pages, plenary talk at QFEXT07, Leipzig, September 200
Electrodynamics of a Cosmic Dark Fluid
Cosmic Dark Fluid is considered as a non-stationary medium, in which
electromagnetic waves propagate, and magneto-electric field structures emerge
and evolve. A medium - type representation of the Dark Fluid allows us to
involve into analysis the concepts and mathematical formalism elaborated in the
framework of classical covariant electrodynamics of continua, and to
distinguish dark analogs of well-known medium-effects, such as optical
activity, pyro-electricity, piezo-magnetism, electro- and magneto-striction and
dynamo-optical activity. The Dark Fluid is assumed to be formed by a duet of a
Dark Matter (a pseudoscalar axionic constituent) and Dark Energy (a scalar
element); respectively, we distinguish electrodynamic effects induced by these
two constituents of the Dark Fluid. The review contains discussions of ten
models, which describe electrodynamic effects induced by Dark Matter and/or
Dark Energy. The models are accompanied by examples of exact solutions to the
master equations, correspondingly extended; applications are considered for
cosmology and space-times with spherical and pp-wave symmetries. In these
applications we focused the attention on three main electromagnetic phenomena
induced by the Dark Fluid: first, emergence of Longitudinal Magneto-Electric
Clusters; second, generation of anomalous electromagnetic responses; third,
formation of Dark Epochs in the Universe history.Comment: 39 pages, 0 figures, replaced by the version published in MDPI
Journal "Symmetry" (Special Issue: Symmetry: Feature Papers 2016); typos
correcte
Foundations of Electromagnetism, Equivalence Principles and Cosmic Interactions
We look at the foundations of electromagnetism in this chapter of the
"eletromagnetism" book. For doing this, after some review (constraints on
photon mass etc.), we use two approaches. The first one is to formulate a
Parametrized Post-Maxwellian framework to include QED corrections and a
pseudoscalar photon interaction. We discuss various vacuum birefringence
experiments - ongoing and proposed - to measure these parameters. The second
approach is to look at electromagnetism in gravity and various experiments and
observations to determine its empirical foundation. We found that the
foundation is solid with the only exception of a potentially possible
pseudoscalar-photon interaction. We discussed its experimental constraints and
look forward to more future experiments.Comment: 25 pages, 4 figures, 2 pages, it is written as a chapter for the book
"Electromagnetism" (ISBN 979-953-307-400-8) to be published by INTECH (open
access), December, 201