It is very difficult to obtain a realistic model of a closed inflationary universe. Even if one fine-tunes the total number of e-folds to be sufficiently small, the resulting universe typically has large density perturbations on the scale of the horizon. We describe a class of models where this problem can be resolved. The models are unattractive and fine-tuned, so the flatness of the universe remains a generic prediction of inflationary cosmology. Nevertheless one should keep in mind that with the fine-tuning at the level of about one percent one can obtain a semi-realistic model of a closed inflationary universe. The spectrum of density perturbations in this model may have a cut-off on the scale of the horizon. Similar approach may be val...
Part I : Models of cosmological inflation are plagued with a severe and seemingly unavoidable proble...
The theoretical prejudice for a flat universe with an initially scale-invariant power spectrum has r...
tbattefe(AT)astro.physik.uni-goettingen.de Abstract. We consider inflation driven near a saddle poin...
The possibility of defining a valid power-law inflationary model of an open universe with a primordi...
Yes, if the universe has compact topology. Inflation is currently the most elegant explanation of wh...
If inflation can occur only at the energy density V much smaller than the Planck density, which is t...
In the context of open inflation, we calculate the probability distribution for the density paramete...
The aim of this paper is to show, that the 'oscillating universe' is a viable alternative to inflati...
Taking field theory seriously, inflation model-building is difficult but not impossible. The observe...
Inflation predicts a spectrum of scalar and tensor perturbations that can be tested by present cosmo...
We study a supergravity model of inflation essentially depending on one parameter which can be ident...
Following Freivogel et al we consider inflation in a predictive (or 'friendly') region of the landsc...
Recently a mechanism was proposed whereby the primordial density perturbations are generated at the ...
Our Universe may be contained in one among a diverging number of bubbles that nucleate within an ete...
We propose a model for early universe cosmology without the need for fundamental scalar fields. Cosm...
Part I : Models of cosmological inflation are plagued with a severe and seemingly unavoidable proble...
The theoretical prejudice for a flat universe with an initially scale-invariant power spectrum has r...
tbattefe(AT)astro.physik.uni-goettingen.de Abstract. We consider inflation driven near a saddle poin...
The possibility of defining a valid power-law inflationary model of an open universe with a primordi...
Yes, if the universe has compact topology. Inflation is currently the most elegant explanation of wh...
If inflation can occur only at the energy density V much smaller than the Planck density, which is t...
In the context of open inflation, we calculate the probability distribution for the density paramete...
The aim of this paper is to show, that the 'oscillating universe' is a viable alternative to inflati...
Taking field theory seriously, inflation model-building is difficult but not impossible. The observe...
Inflation predicts a spectrum of scalar and tensor perturbations that can be tested by present cosmo...
We study a supergravity model of inflation essentially depending on one parameter which can be ident...
Following Freivogel et al we consider inflation in a predictive (or 'friendly') region of the landsc...
Recently a mechanism was proposed whereby the primordial density perturbations are generated at the ...
Our Universe may be contained in one among a diverging number of bubbles that nucleate within an ete...
We propose a model for early universe cosmology without the need for fundamental scalar fields. Cosm...
Part I : Models of cosmological inflation are plagued with a severe and seemingly unavoidable proble...
The theoretical prejudice for a flat universe with an initially scale-invariant power spectrum has r...
tbattefe(AT)astro.physik.uni-goettingen.de Abstract. We consider inflation driven near a saddle poin...