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| [[Particle physics]], which deals with the interactions of elementary particles at high energies, is an important component of [[Physical cosmology|cosmological]] models of the [[early universe]], when the universe was dominated by radiation and its average energy density was very high. Because of this, [[pair production]], [[scattering]] processes and [[Particle decay|decay]] of unstable particles are important in cosmology.
| | Alyson is the name people use to call me and I believe it seems quite great when you say it. Some time ago she chose to live in Alaska and her parents live nearby. Office supervising is exactly where her primary income comes from. I am really fond of handwriting but I can't make it my occupation truly.<br><br>Take a look at my site :: [http://cspl.postech.ac.kr/zboard/Membersonly/144571 certified psychics] |
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| As a thumb rule, a scattering or a decay process is cosmologically important in a certain cosmological epoch if its relevant time scale is smaller or even to the time scale of the universe expansion, which is <math>\frac{1}{H}</math> with <math>H</math> being the [[Hubble constant]] at that time. This is roughly equal to the age of the universe at that time.
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| Cosmological observations of phenomena such as the [[cosmic microwave background]] and the [[Abundance of the chemical elements|cosmic abundance of elements]], together with the predictions of the [[Standard Model]] of particle physics, place constraints on the conditions of the early universe. The success of the Standard Model at explaining these observations provides a confirmation of its validity outside of laboratory conditions. In addition, phenomena extrapolated from cosmological observations, such as [[dark matter]] and [[CP-violation]], suggest a need for physics that goes [[beyond the Standard Model]].
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| ==Further reading==
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| *{{cite book | last = Allday | first = Jonathan | title = Quarks, Leptons and the Big Bang | publisher = Second Edition | year = 2002 | isbn = 978-0-7503-0806-9 }}
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| * [[Lars Bergström (physicist)|Bergström, Lars]] & Goobar, Ariel (2004); ''Cosmology and Particle Astrophysics'', 2nd ed. [[Springer Science+Business Media|Springer Verlag]]. ISBN 3-540-43128-4.
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| * Branco, G. C., Shafi, Q., & Silva-Marcos, J. I. (2001). ''Recent developments in particle physics and cosmology''. Dordrecht: [[Wolters Kluwer|Kluwer Academic]]. ISBN 0-7923-7181-X
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| * Collins, P. D. B. (2007). ''Particle physics and cosmology''. New York: [[John Wiley & Sons]]. ISBN 0-471-12071-5
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| * Kazakov, D. I., & Smadja, G. (2005). ''[http://books.google.com/books?id=CFRFYGrESxQC&pg=PA181&lpg=PA181&dq=%22particle+physics+in+cosmology%22&source=web&ots=OYL3bsedBC&sig=cb5L9sU2hFE-n0HF47e_KGankLo&hl=en#PPT8,M1 Particle physics and cosmology the interface]''. NATO science series, v. 188. Dordecht: [[Springer Science+Business Media|Springer]]. ISBN 1-4020-3161-0
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| * {{cite journal |title=Science and technology - Cosmology and particle physics - What can the matter B? |year=2006 |journal=[[The Economist]] |issue=379 |number=8474 |pages=94 |oclc=102695447}}
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| [[Category:Physical cosmology| ]]
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| [[Category:Particle physics]]
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| {{physics-stub}}
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