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T: Fachverband Teilchenphysik

T 23: Theoretische Astroteilchenphysik und Kosmologie 2

T 23.8: Vortrag

Dienstag, 10. März 2009, 18:30–18:45, M114

The smallness of the cosmological constant Λ — •Jürgen Brandes — Danziger Str. 65, 76307 Karlsbad

’To explain the smallness of the cosmological constant Λ is one of the most outstanding challenges in modern theoretical physics’ because Λ_observed = 10⁻¹²² Λ_theoretical and ’thus wrong by 122 orders of magnitude’ [1]. One possible solution is given by the Robertson-Walker-Metric (RWM) since it describes two different scenarios: (a) Expansion of the universe together with creation of time and space at big bang, (b) expansion of a meta-galaxy similar to a dust-like star but within space and time [2]. In this case the non-empty vacuum exists before big bang and Λ_obs = Λ_theo(changed by big bang) - Λ_theo(before big bang), possibly small or even zero. In case (a) the non-empty vacuum is created during expansion and this means Λ_obs = Λ_theo and the problem above remains.

Questions to be discussed: Observable universe possibly an expanding meta-galaxy [2], Λ_theo changeable in the manner of quintessence models?