Quintessence and the rest of the world - INSPIRE

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Quintessence and the rest of the world

Sean M. Carroll
(
- Santa Barbara, KITP
)

Jun, 1998

12 pages

Published in:

Phys.Rev.Lett. 81 (1998) 3067-3070

e-Print:

astro-ph/9806099 [astro-ph]

DOI:

10.1103/PhysRevLett.81.3067

Report number:

NSF-ITP-98-063

View in:

ADS Abstract Service

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Abstract: (arXiv)

A nearly-massless, slowly-rolling scalar field

\phi

may provide most of the energy density of the current universe. One potential difficulty with this idea is that couplings to ordinary matter, even if suppressed by the Planck scale, should lead to observable long-range forces and time dependence of the constants of nature. I explore the possibility that an approximate global symmetry serves to suppress such couplings even further. Such a symmetry would allow a coupling of

\phi

to the pseudoscalar

F_{\mu\nu}\widetilde F^{\mu\nu}

of electromagnetism, which would rotate the polarization state of radiation from distant sources. This effect is fairly well constrained, but it is conceivable that future improvements could lead to a detection of a cosmological scalar field.

field theory: scalar
energy: density
coupling: matter
symmetry: nonlocal
electromagnetic field
polarization: vector
force: long-range
fundamental constant: time dependence
numerical calculations
bibliography

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