Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-07-30
Phys.Rev.D78:084013,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Replaced with published version. 15 pages, no figures, revtex4. Reference added
Scientific paper
10.1103/PhysRevD.78.084013
Analogue models for gravity intend to provide a framework where matter and gravity, as well as their intertwined dynamics, emerge from degrees of freedom that have a priori nothing to do with what we call gravity or matter. Bose Einstein condensates (BEC) are a natural example of analogue model since one can identify matter propagating on a (pseudo-Riemannian) metric with collective excitations above the condensate of atoms. However, until now, a description of the "analogue gravitational dynamics" for such model was missing. We show here that in a BEC system with massive quasi-particles, the gravitational dynamics can be encoded in a modified (semi-classical) Poisson equation. In particular, gravity is of extreme short range (characterized by the healing length) and the cosmological constant appears from the non-condensed fraction of atoms in the quasi-particle vacuum. While some of these features make the analogue gravitational dynamics of our BEC system quite different from standard Newtonian gravity, we nonetheless show that it can be used to draw some interesting lessons about "emergent gravity" scenarios.
Girelli Florian
Liberati Stefano
Sindoni Lorenzo
No associations
LandOfFree
Gravitational dynamics in Bose Einstein condensates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gravitational dynamics in Bose Einstein condensates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gravitational dynamics in Bose Einstein condensates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-259968