7.13 Going further

Beyond the various theoretical issues we have discussed above there is the important question of “experimental analogue gravity” – to what extent can all these ideas be tested in direct laboratory experiments? Currently several experimental groups are investigating analogue models – surface wave experiments [17, 532, 682, 334], a BEC-based experiment [369], and the fibre-optic experiment [66]. Broadly speaking, for any experimental group interested in analogue spacetimes the two key issues to address are:

While the consensus in the theoretical community is that Bose–Einstein condensates are likely to provide the best working model for analogue gravity, it is possible that we might still be surprised by experimental developments. We leave this as an open challenge to the experimental community.

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