12 research outputs found
Breakdown of Semiclassical Methods in de Sitter Space
Massless interacting scalar fields in de Sitter space have long been known to
experience large fluctuations over length scales larger than Hubble distances.
A similar situation arises in condensed matter physics in the vicinity of a
critical point, and in this better-understood situation these large
fluctuations indicate the failure in this regime of mean-field methods. We
argue that for non-Goldstone scalars in de Sitter space, these fluctuations can
also be interpreted as signaling the complete breakdown of the semi-classical
methods widely used throughout cosmology. By power-counting the infrared
properties of Feynman graphs in de Sitter space we find that for a massive
scalar interacting through a \lambda \phi^4$ interaction, control over the loop
approximation is lost for masses smaller than m \simeq \sqrt \lambda H/2\pi,
where H is the Hubble scale. We briefly discuss some potential implications for
inflationary cosmology.Comment: 24 pages, 7 figures, v2; added references, clarified the resummation
discussio
A combined beta-beam and electron capture neutrino experiment
The next generation of long baseline neutrino experiments will aim at
determining the value of the unknown mixing angle, theta_{13}, the type of
neutrino mass hierarchy and the presence of CP-violation in the lepton sector.
Beta-beams and electron capture experiments have been studied as viable
candidates for long baseline experiments. They use a very clean electron
neutrino beam from the beta-decays or electron capture decays of boosted ions.
In the present article we consider an hybrid setup which combines a beta-beam
with an electron capture beam by using boosted Ytterbium ions. We study the
sensitivity to the CP-violating phase delta and the theta_{13} angle, the
CP-discovery potential and the reach to determine the type of neutrino mass
hierarchy for this type of long baseline experiment. The analysis is performed
for different neutrino beam energies and baselines. Finally, we also discuss
how the results would change if a better knowledge of some of the assumed
parameters was achieved by the time this experiment could take place.Comment: 35 pp, 11 fig