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- W2040581639 abstract "In a recent paper the influence of adiabatic particle production processes on the dynamics of a homogeneous and isotropic universe was studied on a phenomenological level. For a sufficiently high particle production rate these investigations resulted in a nonsingular cosmological model starting with a de Sitter phase and finite maximum values of all matter quantities. As the particle production rate decays there is a smooth transition to the familiar Friedmann-Lemaitre-Robertson-Walker (FLRW) behaviour. In the present paper, scalar perturbations about this homogeneous and isotropic background are studied using a previously developed thermodynamically oriented gauge-invariant formalism. It turns out that the gauge-invariantly defined fractional adiabatic energy density perturbations are unstable on large scales during the initial de Sitter phase. These perturbations may grow quadratically with the cosmic time. Approaching the radiation-dominated period there is a change to the well known linear growth." @default.
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- W2040581639 date "1993-09-01" @default.
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- W2040581639 title "Cosmological perturbations in a universe with particle production" @default.
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- W2040581639 doi "https://doi.org/10.1088/0264-9381/10/9/019" @default.
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