Slow roll approximation
Webb26 okt. 2000 · Inflationary predictions for the anisotropy of the cosmic microwave background radiation are often based on the slow-roll approximation. We study the … Webbslow-roll approximation, which is expected to be accurate to a few percent or better. From these expressions, we can compute the spectral indices [8]: ns ≃ 1− 6ǫ+ 2η ; nt ≃ −2ǫ. (24.6) Another useful quantity is the ratio of the two spectra, defined by r ...
Slow roll approximation
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Webb3 apr. 2014 · the slow-roll approximation and in ligh t of the data from BICEP2. Along the wa y, w e find general consistency relations at which observ ables are sub ject if the … Webb15 dec. 1994 · The meaning of the inflationary slow-roll approximation is formalized. Comparisons are made between an approach based on the Hamilton-Jacobi equations, …
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 … WebbIn 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.
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. 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.
Webb16 dec. 2024 · When the slow-roll approximation is violated in constant-roll inflation, the scalar and tensor perturbations equations derived in the slow-roll approximation case also require modification.
Webb3 apr. 2014 · Testing the slow-roll approximation, Hybrid Natural Inflation and the tensor index with BICEP2 Authors: Mariana Carrillo Gonzalez Imperial College London Gabriel Germán Universidad Nacional... increase in telework during the pandemicWebb6 apr. 2024 · The values (b, χ) are reached by an instanton we have described if they lie on a slow-roll trajectory (a Re, ϕ Re) which has passed through for some where the slow-roll … increase in thermal energy equationWebbbe 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 … increase in turbidityWebbWe 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… increase in total bilirubinWebbthe 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 … increase in thirst medical termWebb4 aug. 1994 · The meaning of the inflationary slow-roll approximation is formalised. Comparisons are made between an approach based on the Hamilton-Jacobi equations, … increase in turnoverWebbapproximate 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 increase in thickness of hyaline cartilage