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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Arrow of time | 4/4 | https://en.wikipedia.org/wiki/Arrow_of_time | reference | science, encyclopedia | 2026-05-05T11:15:00.259019+00:00 | kb-cron |
Certain subatomic interactions involving the weak nuclear force violate the conservation of both parity and charge conjugation, but only very rarely. An example is the kaon decay. According to the CPT theorem, this means they should also be time-irreversible, and so establish an arrow of time. Such processes should be responsible for matter creation in the early universe. That the combination of parity and charge conjugation is broken so rarely means that this arrow only "barely" points in one direction, setting it apart from the other arrows whose direction is much more obvious. This arrow had not been linked to any large-scale temporal behaviour until the work of Joan Vaccaro, who showed that T violation could be responsible for conservation laws and dynamics.
== See also == A Brief History of Time Anthropic principle Ilya Prigogine Loschmidt's paradox Maxwell's demon Quantum Zeno effect Royal Institution Christmas Lectures 1999 Samayā Time evolution Time flies like an arrow Time reversal signal processing Wheeler–Feynman absorber theory
== References ==
== Further reading == Lebowitz, Joel L. (2008). "Time's arrow and Boltzmann's entropy". Scholarpedia. 3 (4): 3448. Bibcode:2008SchpJ...3.3448L. doi:10.4249/scholarpedia.3448. Boltzmann, Ludwig (1964). Lectures On Gas Theory. University Of California Press. Translated from the original German by Stephen G. Brush. Originally published 1896/1898. Carroll, Sean (2010). From Eternity to Here: The Quest for the Ultimate Theory of Time. Dutton. Website. Coveney, Peter; Highfield, Roger (1990), The Arrow of Time: A voyage through science to solve time's greatest mystery, London: W. H. Allen, Bibcode:1990atvt.book.....C, ISBN 978-1-85227-197-8. Feynman, Richard (1965). The Character of Physical Law. BBC Publications. Chapter 5. Halliwell, J. J.; et al. (1994). Physical Origins of Time Asymmetry. Cambridge. ISBN 978-0-521-56837-1. (technical). Mersini-Houghton, L., Vaas, R. (eds.) (2012) The Arrows of Time. A Debate in Cosmology. Springer. 2012-06-22. ISBN 978-3-642-23258-9. (partly technical). Münster, Gernot (2026). "What is Time? - Thoughts of a Physicist". In Blass, Heribert; Bleger, Leopoldo; Picard, Joëlle (eds.). Time and the Experience of Time. London and New York: Routledge. pp. 41–53. ISBN 978-1-041-11405-5.{{cite book}}: CS1 maint: multiple names: editors list (link) Peierls, R (1979). Surprises in Theoretical Physics. Princeton. Bibcode:1979stp..book.....P. Section 3.8. Penrose, Roger (1989). The Emperor's New Mind. Oxford University Press. ISBN 978-0-19-851973-7. Chapter 7. Penrose, Roger (2004). The Road to Reality. Jonathan Cape. ISBN 978-0-224-04447-9. Chapter 27. Price, Huw (1996). Time's Arrow and Archimedes' Point. Oxford University Press. ISBN 978-0-19-510095-2. Website. Zeh, H. D (2010). The Physical Basis of The Direction of Time. Springer. ISBN 978-3-540-42081-1. Official website for the book. "BaBar Experiment Confirms Time Asymmetry".
== External links == Fieser, James; Dowden, Bradley (eds.). "The Arrow of Time". Internet Encyclopedia of Philosophy. ISSN 2161-0002. OCLC 37741658. The Ritz-Einstein Agreement to Disagree, a review of historical perspectives of the subject, prior to the evolvement of quantum field theory The Thermodynamic Arrow: Puzzles and Pseudo-Puzzles Huw Price on Time's Arrow Arrow of time in a discrete toy model The Arrow of Time Why Does Time Run Only Forwards, by Adam Becker, bbc.com Carroll, Sean M. (14 January 2011). Cosmology and the arrow of time: Sean Carroll at TEDxCaltech (Video). New York; Vancouver, British Columbia: TED Conferences LLC. Archived from the original on 20 December 2019. Retrieved 20 January 2020.