ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Robert Caldwell (Dartmouth College)
Title: Ideas for lab tests of dark energy
Date (JST): Thu, Apr 11, 2013, 13:30 - 14:30
Place: Seminar Room A
Related File: 907.pdf
Abstract: A cosmic scalar field evolving very slowly in time can account for the observed dark energy of the Universe. Unlike a cosmological constant, an evolving scalar field also has local spatial gradients due to gravity. If the scalar field has a minimal derivative coupling to electromagnetism, it will cause modifications of Maxwell's equations. In particular, in the presence of a scalar field gradient generated by Earth's gravity, regions with a magnetic field appear to be electrically charged and regions with a static electric field appear to contain electric currents. We propose experiments to detect such effects with sensitivity exceeding current limits on scalar field interactions from measurements of cosmological birefringence.