Dark Energy from Mass Varying Neutrinos. and. Neutrino Oscillation Experiments. Neutrino Factory 2004, based on Rob Fardon, A.E.N., Neal Weiner; astro-ph/0309800 David B. Kaplan, A.E.N., Neal Weiner; hep-ph/0401099 Kathryn Zurek, hep-ph/0405141 Kiyoshi Shiraishi, unpublished.
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Neutrino Oscillation Experiments
Neutrino Factory 2004, based on
Rob Fardon, A.E.N., Neal Weiner; astro-ph/0309800
David B. Kaplan, A.E.N., Neal Weiner; hep-ph/0401099
Kathryn Zurek, hep-ph/0405141
Kiyoshi Shiraishi, unpublished
23% Dark Matter -> some garden variety pressureless clumpy fluid
73% “Dark Energy” -> exotic negative pressure smoothsubstance
usually attributed to the energy of the vacuum⎯energy density which does not dilute with expansion and is therefore equivalent to Einstein’s cosmological constant. I will assume this is zero.
sometimes assumed to be some weird dynamical “quintessence” substance with equation of state parameter w near -1 which nevertheless does not clump (not your typical nonrelativistic stuff)
Our Universe is mostly mysterious dark stuff
la slowly rolling scalar field (m~H-1~ 10-33eV)
dfrustrated network of strings/domain walls
4relativistic, freely streaming particles
of n Mass
Absolute mass scale? CP? Majorana or Dirac? LSND outlier?
sensitivity to new forces, high scales,
ultraweak interactions, new states
neutrino expts. has always been wrong!
More Coincidences- Understand Neutrinos Now?
Why so complicated?
matter from large scale structure. Dark energy
currently scales very differently.
Scaling behavior of dark energy must have recently
changed (Why Now?)
scale like dark energy?
Isn’t varying neutrino mass crazy?
The issue is not ‘whether’, but
‘how much’ neutrino mass should vary !
Assume “Dark Sector” (= unknown particles with no standard Model charges) contains
1A scalar field A
1A fermion field n
1A Yukawa coupling A n n
1 A scalar potential V ( A )
Assume “Our sector” contains
1Active Neutrinos n
æNeutrino mass matrix ( )
Neutrino mass matrix ( )
For large <A> light neutrino mass is (y H) 2/ A
Assume V ( A )slowly increasing function of A.
V is then slowly decreasing function of the light neutrino mass
V(A (mn) ) ~ mn(1+w)/ w
a milli-eV scale for new physics.
mass) leads to Dark Energy
model, which requires a mass scale of
(V= dark energy density)
Generic tests difficult, not impossible.
A dilutesshould have coupling to matter
Loop suppressed and/or
Planck/String scale suppressed
Possible very interesting terms:
Other effects of environment?
Recent unofficial, preliminary analysis of SuperK atmospheric neutrinos by Kiyoshi Shiraishi assuming no oscillations in air fits all data well
Very weak (consistent with LSND?) upper bound on mass squared difference in rock from contained, partially contained events, K2K
reanalysis of upward through going and upward stopping muons underway, probably yields best upper bound on Dm2 in rock
Do Neutrinos ever oscillate in air?
The Outlier: atmospheric neutrinos by Kiyoshi Shiraishi assuming
Conventional Wisdom: need > 3 neutrinos to get 3 independent masses squared, and oscillations involving extra dark states constrained by Bugey, CDHS, Cosmology, and Supernova, so LSND must be wrong
oscillations in High
Constraints on Standard
Effects of environment in neutrino oscillations? atmospheric neutrinos by Kiyoshi Shiraishi assuming
0nbb decay depends on density of source?
Tritium endpoint searches for absolute n mass depends on density of source?
Cosmologically “impossible” sterile neutrinos?
Cosmologically “inconsistent” neutrino masses?
A MiniBooNE signal for nmdisappearanceor ne appearance
Smoking Guns for MaVaNs