Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-18
Phys.Lett. B495 (2000) 277-283
Astronomy and Astrophysics
Astrophysics
6 pages, no figure, differs from gr-qc/9608018
Scientific paper
10.1016/S0370-2693(00)01253-3
We consider the evolution of perturbed cosmological spacetime with multiple scalar fields in Einstein gravity. A complete set of scalar-type perturbation equations is presented in a gauge-ready form, and we derived the closed set of second-order differential equations in several useful forms. Conserved behaviors of the perturbed three-space curvature in the comoving gauge, $\phi_v$, under several conditions are clarified. Under the slow-roll conditions, the adiabatic and isocurvature modes decouple from each other, and in the large-scale limit we have (i) the adiabatic mode is generally conserved, (ii) for a couple of special potential the isocurvature modes decouple from each other and are described by conserved quantities, (iii) in the two field system, the isocurvature mode is described by a conserved quantity for the general potential.
Hwang Jungseek
Noh Hyerim
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