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@Article{Czaja:2011:AWE, author = "Wojciech Czaja and Zdzislaw A. Golda and Andrzej Woszczyna", title = "The Acoustic Wave Equation in the Expanding Universe: {Sachs--Wolfe Theorem}", journal = j-MATHEMATICA-J, volume = "13", number = "??", pages = "??--??", month = "????", year = "2011", CODEN = "????", ISSN = "1047-5974 (print), 1097-1610 (electronic)", bibdate = "Sat Mar 15 08:18:42 MDT 2014", bibsource = "http://www.math.utah.edu/pub/tex/bib/mathematicaj.bib", URL = "http://www.mathematica-journal.com/2011/10/the-acoustic-wave-equation-in-the-expanding-universe-sachs-wolfe-theorem/", abstract = "This article considers the acoustic field propagating in the radiation-dominated ( ) universe of arbitrary space curvature ( ). The field equations are reduced to the d'Alembert equation in an auxiliary static Robertson--Walker spacetime and dispersion relations are discussed.", acknowledgement = ack-nhfb, journal-URL = "http://www.mathematica-journal.com/", }