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Cosmological histories from the Friedmann equation: the Universe as a particle
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 1
2016 (English)In: European journal of physics, ISSN 0143-0807, E-ISSN 1361-6404, Vol. 37, no 5, 055603Article in journal (Refereed) Published
Abstract [en]

In this note, we discuss how possible expansion histories of the Universe can be inferred in a simple way, for arbitrary energy contents. No new physical results are obtained, but the goal is rather to discuss an alternative way of writing the Friedmann equation in order to facilitate an intuitive understanding of the possible solutions; for students and researchers alike. As has been noted in passing by others, this specific form of the Friedmann equation allows us to view the universal expansion as a particle rolling along a frictionless track. Specific examples depicted include the current concordance cosmological model as well as a stable static universal model.

Place, publisher, year, edition, pages
2016. Vol. 37, no 5, 055603
Keyword [en]
cosmology, universal expansion, teaching
National Category
Educational Sciences Physical Sciences
URN: urn:nbn:se:su:diva-134239DOI: 10.1088/0143-0807/37/5/055603ISI: 000381819000040OAI: diva2:1014927
Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2016-10-03Bibliographically approved

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Mörtsell, Edvard
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The Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Physics
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