International Conference on Quantum Physics of Nature (QuPoN 2015) Mitschnitt einer Veranstaltung der Fakultät für Physik am Dienstag, dem 19. Mai 2015 im Großen Festsaal der Universität Wien Teil 20. Philipp Haslinger: "Atom-interferometry constrains on dark energy theories" Schnitt: Daniel Winkler Abstract: If dark energy, which drives the accelerated expansion of the universe, consists of a light scalar field, it might be detectable with normal-matter objects. The simplest such models would lead to a fifth force in conflict with results from experiments using macroscopic test masses such as torsion balances. These constraints on fifth forces can be easily evaded through a variety of screening mechanisms in the presence of typical laboratory matter densities. However, dilute atoms in an ultra-high vacuum environment can serve as ideal test masses which avoid this screening. In our recently developed optical cavity atom interferometer we place new limits on anomalous accelerations at millimeter scale distances from a spherical source mass. These limits rule out a large parameter range of scalar field theories, such as chameleons, which would be consistent with the cosmological dark energy density. With further improvements in sensitivity, atom interferometry will be able to rule out many scalar field dark energy theories with coupling strengths up to the Planck mass. Philipp Haslinger ist Postdoktorand am Department of Physics der University of California in Berkeley. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Introduction 00:00:12 3. Scalar dark energy 00:05:10 4. Atom interferometry 00:08:32 5. Dark energy limits 00:12:07

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