Dark Energy and Cosmic Sound Eisenstein, D. ; Blanton, M. ; Cuesta, A. ; Eckel, J. ; Mehta, K. ; Metchnik, M. ; Padmanabhan, N. ; Percival, W. ; Pinto, P. ; Reid, B. ; Schlegel, D. ; Seo, H. -J. ; Sirko, E. ; Spergel, D. ; White, M. ; Xu, X. Abstract Publication: IAC Talks, Astronomy and Astrophysics Seminars from the Instituto de Astrofísica de Canarias Pub Date: February 2012 Bibcode: 2012iac..talk..370E