Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..194..291e&link_type=abstract
Physics Letters B, Volume 194, Issue 2, p. 291-296.
Physics
39
Scientific paper
Triggered by a solution to the cosmological constant problem recently proposed by Peccei, Solá and Wetterich (PSW), we compile astrophysical and cosmological constraints on a light scalar particle such as a pseudodilaton. The cosmological upper limit on the density of coherent waves in the present-day Universe and data from the Viking space probe together constrain the Compton wavelength of a scalar with gravitational strength couplings to be >~ 1010 ly. Pseudodilatons of the PSW type that get their masses from quantum effects in QCD can only have couplings in the range allowed for invisible axions. A more natural possibility would be that quantum effects associated with other, stronger interactions (cosmocolour) generate the PSW pseudodilaton mass, allowing a larger range of coupling strengths. Alternatively, one could solve the cosmological constant problem by postulating a true dilaton in a finite theory with no intrinsic scale. Speculative possibilities for such a theory are mentioned.
Permanent address: Institute for Theoretical and Experimental Physics, 117 259 Moscow, USSR.
Ellis John
Tsamis Nicholas C.
Voloshin Mikhail
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