Testing Tachyon-Dominated Cosmology with Type Ia Supernovae

Abstract

An open or hyperbolic Friedmann-Robertson-Walker spacetime dominated by tachyonic dark matter can exhibit an ``inflected'' expansion -- initially decelerating, later accelerating -- similar but not identical to that of now-standard $\Lambda$CDM models dominated by dark energy. The features of the tachyonic model can be extracted by fitting the redshift-distance relation of the model to data obtained by treating Type Ia supernovae as standard candles. Here such a model is fitted to samples of 186 and 1048 Type Ia supernovae from the literature. The fits yield values of $H_0=(66.6\pm 1.5)km/s/Mpc$ and $H_0=(69.6\pm 0.4)km/s/Mpc$, respectively, for the current-time Hubble parameter, and $t_0=(8.35\pm 0.68)Gyr$ and $t_0=(8.15\pm 0.36)Gyr$, respectively, for the comoving-time age of the Universe. Tests of the model against other observations will be undertaken in subsequent works.

20 pages, 8 figures