Quantum Gravity Via Expansion-Contraction 70.0: U.K. and USA Explain Dark Energy Via Exponentials

From Osher Doctorow mdoctorow@xxxxxxxxxxx

The U.K. continues its remarkable exponential explorations, this time
via C. G. Bohmer (U. Portsmouth U.K.) et al, "Dark energy as a massive
vector field," gr-qc/0701029, v1 3 Jan 2007, 14 pages, using a theory
which adds a mass term to an older theory of 1972 by USA researchers C.
M. Will of Washington U. St. Louis Missouri USA and K. Nordtvedt of
Northwest Analysis, Bozemann Montana USA (the latter is a private
corporation). The latter has been employed intermittently by CalTech
or JPL (Jet Propulsion Lab) at CalTech.

They (Bohmer et al) propose a model of dark energy in terms of a
massive, Proca type vector field with a non-minimal coupling to the
gravitational field and 3 independent parameters including u_L^2 which
is the mass of the massive cosmological vector particle and scalars w
and eta which descrie non-minimal coupling of the vector field to
respectively the Ricci scalar and Ricci tensor.

The solutions under various assumptions are all exponentials or sums of
exponentials including tanh, coth, sinh, cosh, sinh^n, single
time-dependent exponentials including a remarkable sum:

1) phi_o exp((u/v)Ht) + (2/w)[1 - exp((u/v)Ht)]

with H a constant which for a de Sitter type exponential acceleration
phase for the expansion of the Universe is such that H^2 =
(1/3)cosmological constant.

C. M. Will has 37 arXiv papers, while K. L. Nordtvedt has 15.

Osher Doctorow

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