Evolution of a String Network in Backgrounds with Rolling Horizons
نویسندگان
چکیده
We discuss the temporal variation of the equation of state of a classical string network, evolving in a background in which the Hubble radius H−1 shrinks to a minimum and then re-expands to infinity. We also present a method to look for self-consistent non-vacuum string backgrounds, corresponding to the simultaneous solution of the gravi-dilaton background equations and of the string equations of motion. ————————— To appear in the ”String gravity and physics at the Planck energy scale ” (World Scientific, Singapore, 1995) CERN-TH/95-40 February 1995 EVOLUTION OF A STRING NETWORK IN BACKGROUNDS WITH ROLLING HORIZONS M. Gasperini, M. Giovannini Dipartimento di Fisica Teorica, Università di Torino, Via P.Giuria 1, 10125 Turin, Italy, K. A. Meissner Institute of Theoretical Physics, ul. Hoza 69, 00-681 Warsaw, Poland and G. Veneziano TH. Division, CERN, CH-1211 Geneva 23, Switzerland ABSTRACT We discuss the temporal variation of the equation of state of a classical string network, evolving in a background in which the Hubble radiusH−1 shrinks to a minimum and then re-expands to infinity. We also present a method to look for self-consistent non-vacuum string backgrounds, corresponding to the simultaneous solution of the gravi-dilaton background equations and of the string equations of motion.We discuss the temporal variation of the equation of state of a classical string network, evolving in a background in which the Hubble radiusH−1 shrinks to a minimum and then re-expands to infinity. We also present a method to look for self-consistent non-vacuum string backgrounds, corresponding to the simultaneous solution of the gravi-dilaton background equations and of the string equations of motion.
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