Eur. Phys. J. C (2012) 72: 2095
https://doi.org/10.1140/epjc/s10052-012-2095-x

Regular Article - Theoretical Physics

Dynamics of generalized tachyon field

¹ College of Physical Science and Technology, Hebei University, Baoding, 071002, China
² Department of Physics, Tsinghua University, Beijing, 100084, China

^* e-mail: yangrongjia@tsinghua.org.cn

Received: 3 June 2012
Revised: 24 June 2012
Published online: 4 August 2012

Abstract

We investigate the dynamics of generalized tachyon field in FRW spacetime. We obtain the autonomous dynamical system for the general case. Because the general autonomous dynamical system cannot be solved analytically, we discuss two cases in detail: β=1 and β=2. We find the critical points and study their stability. At these critical points, we also consider the stability of the generalized tachyon field, which is as important as the stability of critical points. The possible final states of the universe are discussed.