Abstract
We demonstrate that the ambiguity of the particle content for quantum fields in a generally curved space-time can be experimentally investigated in an ultracold gas of atoms forming a Bose-Einstein condensate. We explicitly evaluate the response of a suitable condensed matter detector, an “atomic quantum dot,” which can be tuned to measure time intervals associated with different effective acoustic space-times. It is found that the detector response related to laboratory, “adiabatic,” and de Sitter time intervals is finite in time and nonstationary, vanishing, and thermal, respectively.
- Received 3 October 2003
DOI:https://doi.org/10.1103/PhysRevD.69.064021
©2004 American Physical Society