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GR: Fachverband Gravitation und Relativitätstheorie

GR 17: Kosmologie II

GR 17.1: Vortrag

Freitag, 13. März 2009, 11:00–11:20, A214

The Concordance Model and its Dissonances — •Alexander Unzicker — Pestalozzi-Gymnasium München

‘Cosmologists are often in error, but never in doubt’ (L.D.Landau)
The majority of physicists agrees upon that cosmological data ist best described by the Friedmann-Lemaitre model with the currently accepted ΛCDM -paradigm. An increasing number of results however does not fit into the model, such as galactic dynamics, large-scale-structure formation and the coincidence problem. Using further free parameters without having established the nature or dark matter and dark energy is questionable from a methodological point of view - the danger of introducing epicycles. It seems thus worthwhile to review the direct evidence for conventional theories of gravity without assuming its validity a priori. Anomalies like Pioneer and Flyby in the solar system are particulary unsettling because nothing else but the sucess of general relativity in this range can justify the huge extrapolation we perform when considering galactic and cosmological scales. The most crucial point however is the regime of weak accelerations which play a role in most of the anomalous observations. A related discussion is given in gr-qc/0702009.