tipa -- 3/27/2007

Early Optical Polarization of a Gamma Ray Burst Afterglow

• Authors: Carole G. Mundell (1), Iain A. Steele (1), Robert J. Smith (1), Shiho Kobayashi (1) Andrea Melandri (1), Cristiano Guidorzi (1,2,3), Andreja Gomboc (4) Chris J. Mottram (1), David Clarke (5), Alessandro Monfardini (1,6), David Carter (1), David Bersier (1). ((1) Astrophysics Research Institute, Liverpool John Moores University. (2)Dipartimento di Fisica, Universita di Milano-Bicocca, Milano, (3) INAF-Osservatorio Astronomico di Brera, Italy. (4)Faculty of Mathematics and Physics, University in Ljubljana, (5)Department of Physics and Astronomy, University of Glasgow, (6)CNRS, Institut Neel, Grenoble, France.)

Signatures of the extragalactic cosmic-ray source composition from spectrum and shower depth measurements

• Authors: D. Allard, A. V. Olinto, E. Parizot

Dark Matter Halos with Cores from Hierarchical Structure Formation

• Authors: Louis E. Strigari, Manoj Kaplinghat, James S. Bullock

Causality and the speed of sound

• Authors: George Ellis, Roy Maartens, Malcolm MacCallum