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  The analogue cosmological constant in Bose-Einstein condensates: a lesson for quantum gravity

Finazzi, S., Liberati, S., & Sindoni, L. (submitted). The analogue cosmological constant in Bose-Einstein condensates: a lesson for quantum gravity.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D23A-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-36B1-A
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1204.3039 (Preprint), 216KB
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1204.3039
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File downloaded from arXiv at 2012-07-31 11:40
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 Creators:
Finazzi, Stefano, Author
Liberati, Stefano, Author
Sindoni, Lorenzo1, Author              
Affiliations:
1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_67201              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: For almost a century, the cosmological constant has been a mysterious object, in relation to both its origin and its very small value. By using a Bose-Einstein condensate analogue model for gravitational dynamics, we address here the cosmological constant issue from an analogue gravity standpoint. Starting from the fundamental equations describing a system of condensed bosons, we highlight the presence of a vacuum source term for the analogue gravitational field, playing the role of a cosmological constant. In this simple system it is possible to compute from scratch the value of this constant, to compare it with other characteristic energy scales and hence address the problem of its magnitude within this framework, suggesting a different path for the solution of this longstanding puzzle. We find that, even though this constant term is related with quantum vacuum effects, it is not immediately related to the ground state energy of the condensate. On the gravity side this result suggests that the interpretation and computation of the cosmological term as a form of renormalized vacuum energy might be misleading, its origin being related to the mechanism that instead produces spacetime from its pregeometric progenitor, shedding a different light on the subject and at the same time suggesting a potentially relevant role of analogue models in the understanding of quantum gravity.

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 Dates: 2012-04-132012-07-242012
 Publication Status: Submitted
 Pages: 24 pages, 1 figure, Proceedings of the II Amazonian Symposium on Physics
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 Identifiers: arXiv: 1204.3039
URI: http://arxiv.org/abs/1204.3039
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Title: II Amazonian Symposium on Physics
Place of Event: Para, Brazil
Start-/End Date: 2011-05-31 - 2011-06-03

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Title: Analogue spacetimes: The first thirty years
Source Genre: Proceedings
 Creator(s):
Cardoso, V.M.S., Editor
Crispino, L.C.B., Author
Liberati, S., Author
Olieira, E.S. , Author
Visser, M. , Author
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