Slow roll approximation
Webb28 maj 2024 · Nevertheless, the procedure can be simplified if one imposes the slow-roll approximation and introduces the slow-roll parameters [ 83 ], either in the case where … 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.
Slow roll approximation
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Webbapproximate solutions with these types of dynamics for various types of gravity theories. For the case of f(R)-gravity on the basis of the exact solutions and ones obtained in slow-roll approximation it is shown that widely discussed Starobinsky [1,39,40,64–66] and non-minimal Higgs [67–69] inflationary 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.
Webbthe slow roll parameter η. τ on the other hand is also used to denote the optical depth to the surface of last scattering... A photon travels a coordinate distance τ during conformal … WebbSlow roll approximation in quantum cosmology Oliver Janssen Center for Cosmology and Particle Physics, New York University, New York, NY 10003, USA Abstract
Webbslow-roll approximation in classical cosmology to quantum cosmology, where the instantons are complex functions. Our new finding is that the equations of motion for … 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.
WebbThe ‘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 …
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 … highfield first aid courseWebb1 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]. how hoa laws are changing in texashow hobby is good for social lifeWebbIn 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. how hnt mining worksWebbapproximation(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 … how hoa\\u0027s workWebbThe 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 how hnwi investment account workWebbwithout 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. highfield first aid delegate pack