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GR: Fachverband Gravitation und Relativitätstheorie

GR 14: Poster Session (posters are permanently on display)

GR 14.18: Poster

Donnerstag, 21. März 2019, 16:30–18:30, HS 6

The Question of Dark Energy — •Albrecht Giese — Taxusweg 15, 22605 Hamburg

Dark energy is considered to be one of the great mysteries in present day physics. From measurements of the motion of supernovae type Ia it is concluded that the universe is undergoing accelerated expansion. To explain this acceleration, it is assumed that the universe is filled with some type of ("dark") energy.

However, if we follow Hubble's view of the universe, then there is a very unspectacular explanation for the measurement. There are indications that the speed of light 'c' was higher at early times. This inserted into the Doppler equation to determine the star's speed from red-shifts yields higher speeds for early stars. So there is no acceleration.

This is, however, objected by main stream physics by the argument that according to Einstein's relativity 'c' was always constant. But this was not clearly stated by Einstein. And there is anyway the non-understood problem of cosmologic inflation.

To explain the horizon problem, i.e. the apparent logical connection of parts of the universe far apart from each other, the cosmological inflation was introduced. It is the assumption that after the big bang 'space' was extremely small compared to now. Then it expanded first rapidly, these days still slowly. - But there is no understanding why this expansion should have happened. The assumption of a higher 'c' at earlier times can be backed by a comparatively simple model.

Further info: www.ag-physics.org/darkenergy