martes, 24 de julio de 2012

Do we have a Theory of Early Universe Cosmology?


SAO/NASA ADS arXiv e-prints Abstract Service

· Find Similar Abstracts (with default settings below)
· arXiv e-print (arXiv:1204.6108)
· References in the Article
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· Translate This Page
Do we have a Theory of Early Universe Cosmology?
Brandenberger, Robert
eprint arXiv:1204.6108
Publication Date:
Astrophysics - Cosmology and Extragalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology, High Energy Physics - Theory, Physics - History and Philosophy of Physics
42 pages, 7 figures, a more technical version of this article can be found in arXiv:1203.6698, invited talk at the workshop "Philosophical Aspects of Modern Cosmology", 22 - 23 Sept. 2011, Granada, Spain, to be publ. in the proceedings (Special issue: Studies in History and Philosophy of Modern Physics, Elsevier); several clarifying footnotes and some references added
Bibliographic Code:


The inflationary scenario has become the paradigm of early universe cosmology, and - in conjuction with ideas from superstring theory - has led to speculations about an "inflationary multiverse". From a point of view of phenomenology, the inflationary universe scenario has been very successful. However, the scenario suffers from some conceptual problems, and thus it does not (yet) have the status of a solid theory. There are alternative ideas for the evolution of the very early universe which do not involve inflation but which agree with most current cosmological observations as well as inflation does. In this lecture I will outline the conceptual problems of inflation and introduce two alternative pictures - the "matter bounce" and "string gas cosmology", the latter being a realization of the "emergent universe" scenario based on some key principles of superstring theory. I will demonstrate that these two alternative pictures lead to the same predictions for the power spectrum of the observed large-scale structure and for the angular power spectrum of cosmic microwave background anisotropies as the inflationary scenario, and I will mention predictions for future observations with which the three scenarios can be observationally teased apart.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

No hay comentarios: