Particle Creation in Cosmological Models with Varying Gravitational and Cosmological “Constants”
Tóm tắt
Einstein's field equations with variablegravitational coupling G = G(t) and decaying vacuumenergy density Λ = Λ(t) are considered asdescribing matter creation in a cosmological framework.The particle creation rate is determined by thevariation rate of both G and Λ. By consideringsimple phenomenological evolution laws for G and Lambda,an exact solution of the gravitational field equationsfor a flat Friedmann-Robertson-Walker (FRW)space-time is obtained leading to a self-consistentcosmological model describing matter and entropygeneration in the very early Universe.
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