Standard cosmology delayed

String Cosmology versus Standard and Inflationary Cosmology

This paper presents a review of the basic, model-independent differences between the pre-big bang scenario, arising naturally in a string cosmology context, and the standard inflationary scenario. We use an unconventional approach in which the introduction of technical details is avoided as much as possible, trying to focus the reader’s attention on the main conceptual aspects of both scenarios...

Cosmology: Standard Model

Standard Cosmology Through Similarity

In this paper we apply dimensional analysis (D.A.) to two cosmological models: Einsteinde Sitter and one Friedmann-Robertson-Walker (FRW) with radiation predominance. We believe that this method leads to the simplest form of solution the differential equations that arise in both models and would be useful as a base for the solution of more complex models. The aim of the paper is therefore rathe...

Cosmology: Standard and Inflationary

In these lectures, I review the standard hot Big Bang cosmology, emphasizing its successes, its shortcomings, and its major challenges|developing a detailed understanding of the formation of structure in the universe and identifying the constituents of the ubiquitous dark matter. I then discuss the motivations for|and the fundamentals of|in ationary cosmology, particularly emphasizing the quant...

Brane Universe and Standard Cosmology

Brane cosmology takes the unconventional form H ∼ √ρ. To recover the standard cosmology, we have to assume that the matter density is much less than the brane tension. We show that the assumption can be justified even near the end of inflation if we fine-tune the coupling constant of the inflaton potential. As a consequence, the standard cosmology is recovered after inflation. PACS: 98.80-k; 04...