8,282 research outputs found
Consumers' Experience in Massachusetts: Lessons for National Health Reform
Based on interviews, explores the impact of the state's 2006 healthcare reform on access to affordable coverage and on medical debt burdens. Discusses remaining issues and outlines lessons for national reform, including on the role of public programs
Very Special Relativity
By Very Special Relativity (VSR) we mean descriptions of nature whose
space-time symmetries are certain proper subgroups of the Poincar\'e group.
These subgroups contain space-time translations together with at least a
2-parameter subgroup of the Lorentz group isomorphic to that generated by
and . We find that VSR implies special relativity
(SR) in the context of local quantum field theory or of CP conservation. Absent
both of these added hypotheses, VSR provides a simulacrum of SR for which most
of the consequences of Lorentz invariance remain wholly or essentially intact,
and for which many sensitive searches for departures from Lorentz invariance
must fail. Several feasible experiments are discussed for which
Lorentz-violating effects in VSR may be detectable.Comment: 3 pages, revte
Sim(2) and SUSY
The proposal of hep-ph/0601236, that the laws of physics in flat spacetime
need be invariant only under a SIM(2) subgroup of the Lorentz group, is
extended to include supersymmetry. SUSY gauge theories which
include SIM(2) couplings for the fermions in chiral multiplets are formulated.
These theories contain two conserved supercharges rather than the usual four.Comment: 10 pages, revtex4. Note added and sign correcte
Sharp Fronts Due to Diffusion and Viscoelastic Relaxation in Polymers
A model for sharp fronts in glassy polymers is derived and analyzed. The major effect of a diffusing penetrant on the polymer entanglement network is taken to be the inducement of a differential viscoelastic stress. This couples diffusive and mechanical processes through a viscoelastic response where the strain depends upon the amount of penetrant present. Analytically, the major effect is to produce explicit delay terms via a relaxation parameter. This accounts for the fundamental difference between a polymer in its rubbery state and the polymer in its glassy state, namely the finite relaxation time in the glassy state due to slow response to changing conditions. Both numerical and analytical perturbation studies of a boundary
value problem for a dry glass polymer exposed to a penetrant solvent are completed. Concentration profiles
in good agreement with observations are obtained
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