IUCAA Preprints

Browse

Now showing 1 - 1 of 1

Anisotropy dissipation in brane-world inflation
(2001-02-14) Maartens, Roy; Sahni, Varun; Saini, Tarun Deep
We examine the behavior of an anisotropic brane-world in the presence of inﬂationary scalar ﬁelds. We show that, contrary to naive expectations, a large anisotropy does not adversely aﬀect inﬂation. On the contrary, a large initial anisotropy introduces more damping into the scalar ﬁeld equation of motion, resulting in greater inﬂation. The rapid decay of anisotropy in the brane-world signiﬁcantly increases the class of initial conditions from which the observed universe could have originated. This generalizes a similar result in general relativity. A unique feature of Bianchi I brane-world cosmology appears to be that for scalar ﬁelds with a large kinetic term the initial expansion of the universe is quasi-isotropic. The universe grows more anisotropic during an intermediate transient regime until anisotropy ﬁnally disappears during inﬂationary expansion.