Violations of UGR in atomic clocks and atom interferometers
Abstract
The question of which atom-interferometer geometries can be used to test the universality of the gravitational redshift (UGR) is at the center of a long-standing debate. We compare in this contribution classical UGR tests based on the synchronization of two atomic clocks with atom interferometers relying on i) quantum clock interference or ii) internal state transitions during the interferometer. For this purpose, we introduce a dilaton model which consistently parametrizes violations of the Einstein equivalence principle. Based on this model, we derive the corresponding phase shifts for atomic clocks and atom interferometers and study their differences. Consequently, we identify a large class of atom-interferometer geometries which measure violations of UGR.
The QUANTUS project is supported by the German Aerospace Center (DLR) with funds provided by the Federal Ministry of Economics and Technology (BMWi) due to an enactment of the German Bundestag under Grant Number DLR 50WM1956 (QUANTUS V).- Publication:
-
APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DMPG07005D