TY - JOUR
T1 - Searching for granularity of the vacuum
AU - Eichler, D.
N1 - Funding Information:
I am grateful to Y. Avishai, R. Brustein, M. Berry, J. Bekenstein, Y. Band, A. Dar,x E. Gedalin, E. Guendelman, E. Nissimov, S. Nussinov, D. Owen, Z. Seidov, G. Veneziano and V. Usov for vital discussions. I thank the referee for pointing out work by Chang, Liu and coworkers. I acknowledge support from the Israel-US BSF and from the Israeli Science Foundation.
PY - 1999/1/1
Y1 - 1999/1/1
N2 - The hypothesis is considered that the vacuum is a Lorentz non-invariant foam in which translational symmetry is spontaneously broken at the Planck or compactification scale. This could possibly be observed via Rayleigh scattering of ultrahigh energy quanta, and it appears to be ruled out for spin 1/2 leptons by SN 1987a, and independently testable for photons. A weaker version of the hypothesis predicts (for otherwise massless neutrinos) irreversible neutrino mixing over a length scale of lPlanck(Ev/-EPlanck)-2 in comoving cosmic coordinates for a purely four dimensional universe, and, for neutrinos that have spin 3/2 in a higher dimensional manifold above the energy scale ηEplanck, the mixing is predicted to take place over a scale of η-4 times this length. Such neutrino mixing might also be observable with atmospheric and solar neutrino experiments, and account for some of the observed deficits. Long distance terrestrial experiments would test the latter hypothesis unequivocably.
AB - The hypothesis is considered that the vacuum is a Lorentz non-invariant foam in which translational symmetry is spontaneously broken at the Planck or compactification scale. This could possibly be observed via Rayleigh scattering of ultrahigh energy quanta, and it appears to be ruled out for spin 1/2 leptons by SN 1987a, and independently testable for photons. A weaker version of the hypothesis predicts (for otherwise massless neutrinos) irreversible neutrino mixing over a length scale of lPlanck(Ev/-EPlanck)-2 in comoving cosmic coordinates for a purely four dimensional universe, and, for neutrinos that have spin 3/2 in a higher dimensional manifold above the energy scale ηEplanck, the mixing is predicted to take place over a scale of η-4 times this length. Such neutrino mixing might also be observable with atmospheric and solar neutrino experiments, and account for some of the observed deficits. Long distance terrestrial experiments would test the latter hypothesis unequivocably.
UR - http://www.scopus.com/inward/record.url?scp=0009568930&partnerID=8YFLogxK
U2 - 10.1016/S0370-2693(99)00693-0
DO - 10.1016/S0370-2693(99)00693-0
M3 - Article
AN - SCOPUS:0009568930
SN - 0370-2693
VL - 459
SP - 86
EP - 90
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-3
ER -