Ulm 2004 – wissenschaftliches Programm
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GR: Gravitation und Relativitätstheorie
GR 2: Experimentelle Tests, Quantengravitation
GR 2.7: Fachvortrag
Dienstag, 16. März 2004, 16:30–16:50, H20
Gravitational bound quantum states and limits on large extra dimensions — •Hartmut Abele1, Stefan Baessler2, and Alexander Westphal3 — 1Physikalisches Institut der Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany — 2Physikalisches Institut der Universität Mainz, Staudingerweg 7, 55099 Mainz, Germany — 3DESY Hamburg, Notkestraße 85, 22607 Hamburg, Germany
New motivations for gravity experiments come from frameworks where the fundamental Planck scale, the scale where gravity becomes comparable in strength to the other interactions at 10−44s after the big bang, is taken to the weak scale, the energy scale of the Standard Model at 10−10s after the big bang. In such a scenario, large extra dimensions exist and they may have observable effects at submillimeter distances. Our recent gravity experiment demonstrates quantum states in the gravitational potential of the Earth with ultra-cold neutrons. A side-effect of this experiment is its sensitivity for gravity-like forces at length scales below 10 microns. In light of recent theoretical developments in higher dimensional field theory, gauge fields can mediate forces that are 1010 times stronger than gravity at submillimeter distances, exactly in the interesting range of our experiment. The experiment places limits on gravity-like forces in the range below 10 microns.