Testing Tachyon-Dominated Cosmology with Type Ia Supernovae
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| Format: | Preprint |
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2024
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| _version_ | 1866913275816443904 |
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| author | Kramer, Samuel H. Redmount, Ian H. |
| author_facet | Kramer, Samuel H. Redmount, Ian H. |
| contents | 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 $Λ$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 $H_0=(66.6\pm1.5)~\hbox{km/s/Mpc}$ and $H_0=(69.6\pm0.4)~\hbox{km/s/Mpc}$, respectively, for the current-time Hubble parameter, and $t_0=(8.35\pm0.68)~\hbox{Gyr}$ and $t_0=(8.15\pm0.36)~\hbox{Gyr}$, respectively, for the comoving-time age of the Universe. Tests of the model against other observations will be undertaken in subsequent works. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_13859 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Testing Tachyon-Dominated Cosmology with Type Ia Supernovae Kramer, Samuel H. Redmount, Ian H. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology 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 $Λ$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 $H_0=(66.6\pm1.5)~\hbox{km/s/Mpc}$ and $H_0=(69.6\pm0.4)~\hbox{km/s/Mpc}$, respectively, for the current-time Hubble parameter, and $t_0=(8.35\pm0.68)~\hbox{Gyr}$ and $t_0=(8.15\pm0.36)~\hbox{Gyr}$, respectively, for the comoving-time age of the Universe. Tests of the model against other observations will be undertaken in subsequent works. |
| title | Testing Tachyon-Dominated Cosmology with Type Ia Supernovae |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2403.13859 |