Results 1 to 10 of about 46,516 (78)
Cosmology without inflation [PDF]
We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce. This category of models, being geodesically complete, is non-singular and horizon-free, and can be made to prevent any relevant scale to ever have been smaller than the Planck ...
Peter, Patrick, Pinto-Neto, Nelson
openaire +5 more sources
Inflation in multidimensional quantum cosmology [PDF]
We extend to multidimensional cosmology Vilenkin's prescription of tunnelling from nothing for the quantum origin of the observable Universe. Our model consists of a $D+4$-dimensional spacetime of topology ${\cal R}\times {\cal S}^3 \times{\cal S}^D$, with a scalar field (``chaotic inflaton'') for the matter component.
Giuseppe Pollifrone+3 more
openaire +5 more sources
Inflation and cosmological constant [PDF]
Abstract In construction of an inflationary model, one usually assumes that the matter sector of the gravitational action is minimally coupled to the background. It means that the matter (inflaton) part of the action is coupled with the same metric of the gravitational part.
openaire +3 more sources
String cosmology and inflation [PDF]
Following a suggestion by Gasperini and Veneziano, that String Cosmology can be reconciled with Inflation and, hence, with the Standard Big Bang, we display an analytical solution which possesses four interesting properties: (1) it is non-singular; (2) it distinguishes the dynamics of the external scale factor, $a(t)$, from that of the internal one, $b(
ANGELANTONJ, Carlo+3 more
openaire +3 more sources
Inflation and Fractional Quantum Cosmology
The Wheeler–DeWitt equation for a flat and compact Friedmann–Lemaître–Robertson–Walker cosmology at the pre-inflation epoch is studied in the contexts of the standard and fractional quantum cosmology. Working within the semiclassical regime and applying the Wentzel-Kramers-Brillouin (WKB) approximation, we show that some fascinating consequences are ...
Seyed Meraj Mousavi Rasouli+3 more
openaire +3 more sources
Relativistic Cosmology with an Introduction to Inflation [PDF]
In this review article, the study of the development of relativistic cosmology and the introduction of inflation in it as an exponentially expanding early phase of the universe is carried out. We study the properties of the standard cosmological model developed in the framework of relativistic cosmology and the geometric structure of spacetime ...
Muhammad Zahid Mughal+2 more
openaire +4 more sources
Inflation in the Rényi cosmology [PDF]
The description of the accelerated phases for the current and primordial cosmos has been obtained in the framework of Rényi cosmology. The results show that corrections to the Friedmann equations, originated from differences between Rényi and Bekenstein entropies, can describe both the current accelerated and inflationary eras.
Amir Hadi Ziaie+3 more
openaire +3 more sources
A built-in inflation in the $$f(T)$$ f ( T ) -cosmology [PDF]
LaTeX2e: 19 pages, 9 figures, 1 table.
Gamal G. L. Nashed+2 more
openaire +3 more sources
Inflation and precision cosmology [PDF]
A brief review of inflation is presented. After having demonstrated the generality of the inflationary mechanism, the emphasize is put on its simplest realization, namely the single field slow-roll inflationary scenario. Then, it is shown how, concretely, one can calculate the predictions of a given model of inflation.
openaire +4 more sources
MSSM inflation and cosmological attractors [PDF]
Inflationary scenarios motivated by the minimal supersymmetric standard model (MSSM) where five scalar fields are non-minimally coupled to gravity are considered. The potential of the model and the function of non-minimal coupling are polynomials of two Higgs doublet convolutions.
M. N. Dubinin+3 more
openaire +4 more sources