Slow roll approximation
Webb1 okt. 2024 · Slow roll inflation requires that the effective inflaton mass should be much smaller than the Hubble parameter during inflation, that is m2 ≪ H2. However, when we try to build an inflation model in the framework of string theory or supergravity, one often encounter an Hubble induced inflaton mass, that is m2 ∼ H2[1], [2].
Slow roll approximation
Did you know?
Webb16 juli 2024 · By taking the slow-roll approximation, we generated interesting scenarios where a Klein Gordon potential leads to observationally consistent inflation observables. Our results make it clear-cut that in addition to the Ricci scalar and scalar fields, the trace of energy momentum tensor also plays a major role in driving inflationary scenarios. Webb29 juni 2024 · For the slow-roll approximation the scalar field behaves as an effective dark energy. The form of the potential is clearly unknown and many different potentials have been studied and confronted with observations. These two regimes of accelerated expansion are treated independently.
WebbWe compute the primordial curvature spectrum generated during warm inflation, including shear viscous effects. The primordial spectrum is dominated by the thermal fluctuations of the radiation bath, sourced by the diss… WebbSlow roll approximation in quantum cosmology Oliver Janssen Center for Cosmology and Particle Physics, New York University, New York, NY 10003, USA Abstract
http://export.arxiv.org/pdf/hep-ph/0602106v1 Webbwithout slow-roll approximation Jinn-Ouk Gong∗ Department of Physics, KAIST, Daejeon, Republic of Korea International Center for Astrophysics, KASI, Daejeon, Republic of Korea† October 16, 2024 Abstract We study an inflationary scenario where thermal inflation is followed by fast-roll inflation.
Webb23 jan. 2024 · The slow-roll approximation is an analytical approach to study dynamical properties of the inflationary universe. In this article, systematic construction of the slow-roll expansion for effective loop quantum cosmology is presented.
Webbbe neglected in the equation of motion, which then takes the slow-rolling form for homogeneous fields: 3Hφ˙ = −dV/dφ. (147) In combination with Friedmann’s equation in … bja education mhWebbapproximation(SRA); this assumes that a term can be neglected in each of the equations of motion to leave the simpler set (41) (42) If we define slow-roll parameters[3] (43) where … dates of the battle of the bulgeWebbSlow-roll inflation and the primordial metric perturbation spectrum . MSc Thesis September 2009 . Author: Trevor Peter Hardcastle . Imperial College London . Abstract . Inflation is … dates of the boxer rebellionWebbThe Slow-Roll Approximation 0 = LO0 p 1− 1 /3, and iteratively applies d which is again a direct consequence of Eq. (2.19). Doing so, one obtains NNLO0 = LO0 Let us move on to the slow-roll trajectory. At next-to-leading order, it proceeds from combining Eq. (2.19) and Eq. (2.22), which gives rise to ∆N SRNLO =− 1 bja education hyponatraemiaWebbIn inflationary theory, many papers start off by making the slow-roll approximation, on which many things depend. This approximation is usually presented by requiring that two 'slow-roll parameters' are small: ϵ V ≡ 1 16 π G ( V ′ V) 2 ≪ 1. η V ≡ 1 8 π G ( V ″ V) ≪ 1. bja education learning difficultiesWebb23 jan. 2024 · The slow-roll approximation is an analytical approach to study dynamical properties of the inflationary universe. In this article, systematic construction of the slow … dates of the battle of gettysburgWebbThe ‘slow-roll approximation’ [3, 4, 5], which neglects the most slowly changing terms in the equations of motion, is the most widely used. Although this approximation works well in … bja education haemorrhage