Extended slow-roll conditions and rapid-roll conditions
نویسندگان
چکیده
منابع مشابه
Extended Slow-Roll Conditions and Rapid-Roll Conditions
We derive slow-roll conditions for a scalar field which is non-minimally coupled with gravity in a consistent manner and express spectral indices of scalar/tensor perturbations in terms of the slow-roll parameters. The conformal invariance of the curvature perturbation is proved without linear approximations. Rapid-roll conditions are also derived, and the relation with the slow-roll conditions...
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In this note we derive the slow-roll and rapid-roll conditions for the minimally and nonminimally coupled space-like vector fields. The function f(B) represents the non-minimal coupling effect between vector fields and gravity, the f = 0 case is the minimal coupling case. For a clear comparison with scalar field, we define a new function F = ±B2/12+f(B2) where B = AμA , Aμ is the “comoving” vec...
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As an extension of our previous study, we derive slow-roll conditions for multiple scalar fields which are non-minimally coupled with gravity and for generalized gravity theories of the form f(φ,R). We provide simple formulae of the spectral indices of scalar/tensor perturbations in terms of the slow-roll parameters. Extended Slow-Roll Conditions and Primordial Fluctuations: Multiple Scalar Fie...
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The slow-roll approximation to inflation is ultimately justified by the presence of inflationary attractors for the orbits of the solutions of the dynamical equations in phase space. There are many indications that the inflaton field couples nonminimally to the spacetime curvature: the existence of attractor points for inflation with nonminimal coupling is demonstrated, subject to a condition o...
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We draw attention to the possibility that inflation (i.e. accelerated expansion) might continue after the end of slow roll, during a period of fast oscillations of the inflaton field φ. This phenomenon takes place when a mild non-convexity inequality is satisfied by the potential V (φ). The presence of such a period of φ-oscillation-driven inflation can substantially modify reheating scenarios....
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2008
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2008/10/021