Cosmic inflation

We study the FCNC problems in 3-4-1-1 model in a way different from the previous work. The sources of FCNC at the tree-level in the 3-4-1-1 model come from both the gauge and scalar sectors. We show that the most stringently bound on the tree-level FCNC interactions comes from the meson oscillations.

12p vispiderman 15-06-2023 4 2   Download

In this paper, we would like to combine these two extensions in a single scenario, in which the canonical scalar field is replaced by the non-canonical one firstly proposed in the so-called k-inflation model.

15p vispiderman 15-06-2023 4 2   Download

In this work (Mathews et al., 2014a) we consider that the present universe is slightly open, i.e. ⌦0 0.994 at the 95% confidence level. In this case, any curvature that existed before inflation could now be visible on the horizon. Such pre-inflation fluctuations in the inflaton field could appear as a cosmic dark (or bulk) flow cosmological flow. We summarize an analytic model (KurkiSuonio et al., 1991; Mathews et al., 2014a) for an open cosmology with an adiabatic planar inhomogeneity of wavelength less than the initial Hubble scale.

5p runordie3 27-06-2022 9 3   Download

In this paper, therefore, we explore the possibility that the universe is slightly open with Ω0 ≈ 0.994. In this case a glimpse of preinflation fluctuations could just now be entering the horizon before the universe becomes totally dark-energy dominated and flat. Our goal, therefore, is to determine what constraints might be placed on inhomogeneities and curvature content in the preinflation universe based upon current cosmological observations.

8p runordie3 27-06-2022 10 3   Download

We will examine whether anisotropic hairs exist in a string-inspired scalar-GaussBonnet gravity model with the absence of potential of scalar field during the inflationary phase. As a result, we are able to obtain the Bianchi type I power-law solution to this model under the assumption that the scalar field acts as the phantom field, whose kinetic is negative definite. However, the obtained anisotropic hair of this model turns out to be large, which is inconsistent with the observational data.

15p viaphrodite2711 14-10-2019 8 1   Download

In particular, we will show that the studied models really admit the Bianchi type I metrics, which are homogeneous but anisotropic space time, as their stable cosmological solutions. Hence, these models turn out to be counterexamples to the cosmic no-hair conjecture.

12p viposeidon2711 17-09-2019 15 0   Download

(bq) part 2 book "physical foundations of cosmology" has contents: cosmic microwave background anisotropies, inflation ii - origin of the primordial inhomogeneities; gravitational instability in general relativity; homogeneous limit; gravitational instability in newtonian theory.

196p bautroibinhyen21 14-03-2017 133 6   Download