Quote:
Originally Posted by avandonk
Steven where does dark matter and dark energy fit in this nice little closed Universe without Alice?
Bert
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Bert,
We had a dark matter issue in the 19th century, it was called Neptune. Scientists then applied a perturbation theory to Newtonian physics to predict the existence of Neptune from the deviations in the theoretical orbit of Uranus.
The same principles for dark matter apply today whether it is through the escape velocities of individual galaxies in a cluster to the rotation curves of galaxies.
Dark energy is based on the type II supernova data for distances.
The point is that one of the common misconceptions of dark matter and dark energy is that they are "made up" to support existing theories. For phenomenological theories such as cosmology, dark matter and dark energy are effects that do not require an Alice Universe.
The problem is with non phenomenological theories such as QFT which need to explain what dark matter and energy actually are.
Regards
Steven