A recently developed technique known as analogue transformation acoustics has
allowed the extension of the transformational paradigm to general spacetime
transformations under which the acoustic equations are not form invariant. In
this paper, we review the fundamentals of analogue transformation acoustics
and show how this technique can be applied to build a device that increases the
density of events within a given spacetime region by simultaneously compressing
space and time.This work was developed under the framework of the ARIADNA contract 4000104572/12/NL/KML of the European Space Agency. C.G.-M., J.S.-D., and A.M. also acknowledge support from Consolider project CSD2008-00066, A.M. from project TEC2011-28664-CO2-02, and C.B. and G.J. from the project FIS2011-30145-C03-01. J.S.-D. acknowledges support from the USA Office of Naval Research.García Meca, C.; Carloni, S.; Barceló, C.; Jannes, GGP.; Sánchez-Dehesa Moreno-Cid, J.; Martínez Abietar, AJ. (2014). Analogue transformation acoustics and the compression of spacetime. Photonics and Nanostructures - Fundamentals and Applications. 12(4):312-318. https://doi.org/10.1016/j.photonics.2014.05.001S31231812
