%0 Conference Paper
%A Nicolaidis, A.
%T Astroparticles and extra dimensions
%C Hamburg
%I Verlag Deutsches Elektronen-Synchrotron
%M PUBDB-2016-05937
%@ 978-3-935702-59-1
%B DESY-PROC
%P 185-191
%D 2014
%< Nicolaidis, A. "Astroparticles and extra dimensions" in Proceedings, 10th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2014)  / Tsesmelis, Emmanuel, Maroudas, Marios (eds.), Verlag Deutsches Elektronen-Synchrotron : 2014 ; AXION-WIMP 2014 : 10th Patras Workshop on Axions, WIMPs and WISPs, 2014-06-29 - 2014-07-04, Geneva
%X In theories with large extra dimensions, besides the graviton living in the bulk, particles which are singlets under the standard model may live in extra dimensions. A singlet neutrino can live in the bulk and its mixing with a standard flavor neutrino offers unconventional patterns of neutrino matter oscillations. These oscillations depend upon two parameters: the brane-bulk coupling ξ and the effective mass μ of the flavor neutrino inside matter. With a 1 km<sup>3</sup> neutrino telescope, extra dimensions with a radius down to 1 μm can be tested directly. An axion particle can live also in extra dimensions. We consider the photon axion mixing and analyze the eigenvalues and eigenstates of the mixing matrix. A resonance condition for the total conversion of a high energy photon into a Kaluza-Klein (KK) axion state is established. This resonant transition may provide a plausible explanation for the transparency of the universe to energetic photons. If the brane we live in is curved, then there are shortcuts through the bulk, which the axion can take. We suggest that such axionic shortcuts are at the root of the dispersion of time arrival of photons.
%B 10th Patras Workshop on Axions, WIMPs and WISPs
%C 29 Jun 2014 - 4 Jul 2014, Geneva (Switzerland)
Y2 29 Jun 2014 - 4 Jul 2014
M2 Geneva, Switzerland
%F PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
%9 Contribution to a conference proceedingsContribution to a book
%R 10.3204/DESY-PROC-2014-03/nikolaidis_argyris
%U https://bib-pubdb1.desy.de/record/315530