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- W3121350771 abstract "We use the dynamics of a galaxy, set up initially at a constant proper distance from an observer, to derive and illustrate two counter-intuitive general relativistic results. Although the galaxy does gradually join the expansion of the universe (Hubble flow), it does not necessarily recede from us. In particular, in the currently favored cosmological model, which includes a cosmological constant, the galaxy recedes from the observer as it joins the Hubble flow, but in the previously favored cold dark matter model, the galaxy approaches, passes through the observer, and joins the Hubble flow on the opposite side of the sky. We show that this behavior is consistent with the general relativistic idea that space is expanding and is determined by the acceleration of the expansion of the universe -- not a force or drag associated with the expansion itself. We also show that objects at a constant proper distance will have a nonzero redshift; receding galaxies can be blueshifted and approaching galaxies can be redshifted." @default.
- W3121350771 created "2021-02-01" @default.
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- W3121350771 date "2003-03-11" @default.
- W3121350771 modified "2023-09-26" @default.
- W3121350771 title "Solutions to the tethered galaxy problem in an expanding universe and the observation of receding blueshifted objects" @default.
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- W3121350771 doi "https://doi.org/10.1119/1.1528916" @default.
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