327 research outputs found
Question Isotropy
The "cosmological principle" was set up early without realizing its
implications for the horizon problem, and almost entirely without support from
observational data. Consistent signals of anisotropy have been found in data on
electromagnetic propagation, polarizations of QSOs and temperature maps.
The axis of Virgo is found again and again in signals breaking isotropy, from
independent observables in independent energy regimes. There are no
satisfactory explanations of these effects in conventional astrophysics.
Axion-photon mixing and propagation in axion condensates are capable of
encompassing the data.Comment: Published in Axions 2010: AIP Conf.Proc.1274:72-77,2010, edited by
David Tanne
Exploring the Micro-Structure of the Proton: from Form Factors to DVCS
For a long time people made the mistake of thinking the proton was
understood. New experiments, ranging from form factors to deeply virtual
Compton scattering, promise a new era of highly informative studies. Among the
controversial topics of the future may be such basic features as the physical
size of the proton, the role of quark orbital angular momentum, and the
possibility of making "femto-photographic" images of hadronic micro-structure.Comment: 19 pages, 2 figures, presented by John Ralston at the Workshop on
"Testing QCD through Spin Observables in Nuclear Targets", University of
Virginia, Charlottesville, Virginia, April 18-2
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