150 lines
4.8 KiB
Markdown
150 lines
4.8 KiB
Markdown
---
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created_at: '2017-01-07T02:37:53.000Z'
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title: What If Time Really Exists? (2008)
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url: https://arxiv.org/abs/0811.3772
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author: privong
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points: 158
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story_text:
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comment_text:
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num_comments: 204
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story_id:
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story_title:
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story_url:
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parent_id:
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created_at_i: 1483756673
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_tags:
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- story
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- author_privong
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- story_13342083
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objectID: '13342083'
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year: 2008
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---
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[Source](https://arxiv.org/abs/0811.3772 "Permalink to [0811.3772] What if Time Really Exists?")
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# [0811.3772] What if Time Really Exists?
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![][1]
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![Cornell University][2]
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[Cornell University][3] [Library][4]
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[We gratefully acknowledge support from
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the Simons Foundation
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and member institutions][5]
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# [arXiv.org][6] > [gr-qc][7] > arXiv:0811.3772
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All papers Titles Authors Abstracts Full text Help pages
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([Help][8] | [Advanced search][9])
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Full-text links:
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## Download:
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* [PDF][10]
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* [Other formats][11]
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([license][12])
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### Current browse context:
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gr-qc
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### Change to browse by:
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[hep-th][17]
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### References & Citations
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* [INSPIRE HEP][18]
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([refers to][19] | [cited by ][20])
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* [NASA ADS][21]
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([what is this?][23])
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### Bookmark
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([what is this?][24])
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# General Relativity and Quantum Cosmology
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# Title: What if Time Really Exists?
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Authors: [Sean M. Carroll][32]
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(Submitted on 23 Nov 2008)
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> Abstract: Despite the obvious utility of the concept, it has often been argued that time does not exist. I take the opposite perspective: let's imagine that time does exist, and the universe is described by a quantum state obeying ordinary time-dependent quantum mechanics. Reconciling this simple picture with the known facts about our universe turns out to be a non-trivial task, but by taking it seriously we can infer deep facts about the fundamental nature of reality. The arrow of time finds a plausible explanation in a "Heraclitean universe," described by a quantum state eternally evolving in an infinite-dimensional Hilbert space.
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| ----- |
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| Comments: | Submission to the Foundational Questions Institute Essay Competition on "The Nature of Time." |
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| Subjects: | General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th) |
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| Cite as: | [arXiv:0811.3772][33] [gr-qc] |
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| | (or [arXiv:0811.3772v1][34] [gr-qc] for this version) |
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## Submission history
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From: Sean Carroll [[view email][35]]
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[**v1]** Sun, 23 Nov 2008 21:07:47 GMT (33kb,D)
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[Which authors of this paper are endorsers?][36] | [Disable MathJax][37] ([What is MathJax?][38])
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Link back to: [arXiv][39], [form interface][40], [contact][41].
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![Twitter][42]
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[1]: //webanalytics.library.cornell.edu/piwik.php?idsite=538&rec=1
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[2]: https://arxiv.org/icons/cu/cul_signature_unstyled.gif
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[3]: http://www.cornell.edu/
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[4]: http://www.library.cornell.edu/
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[5]: https://confluence.cornell.edu/x/ALlRF
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[6]: https://arxiv.org/
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[7]: https://arxiv.org/list/gr-qc/recent
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[8]: https://arxiv.org/help
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[9]: https://arxiv.org/find
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[10]: https://arxiv.org/pdf/0811.3772
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[11]: https://arxiv.org/format/0811.3772
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[12]: http://arxiv.org/licenses/nonexclusive-distrib/1.0/ "Rights to this article"
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[13]: http://arxiv.org/prevnext?site=arxiv.org&id=0811.3772&context=gr-qc&function=prev "previous in gr-qc (accesskey p)"
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[14]: http://arxiv.org/prevnext?site=arxiv.org&id=0811.3772&context=gr-qc&function=next "next in gr-qc (accesskey n)"
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[15]: https://arxiv.org/list/gr-qc/new
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[16]: https://arxiv.org/list/gr-qc/0811
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[17]: https://arxiv.org/abs/0811.3772?context=hep-th
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[18]: https://inspirehep.net/search?p=find+eprint+0811.3772
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[19]: https://arxiv.org/refs/0811.3772
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[20]: https://arxiv.org/cits/0811.3772
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[21]: http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:0811.3772
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[22]: https://arxiv.org/tb/0811.3772
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[23]: https://arxiv.org/help/trackback/
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[24]: https://arxiv.org/help/social_bookmarking
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[25]: https://static.arxiv.org/icons/social/citeulike.png
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[26]: https://static.arxiv.org/icons/social/bibsonomy.png
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[27]: https://static.arxiv.org/icons/social/mendeley.png
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[28]: https://static.arxiv.org/icons/social/delicious.png
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[29]: https://static.arxiv.org/icons/social/digg.png
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[30]: https://static.arxiv.org/icons/social/reddit.png
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[31]: https://static.arxiv.org/icons/social/sciencewise.png
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[32]: https://arxiv.org/find/gr-qc/1/au:+Carroll_S/0/1/0/all/0/1
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[33]: https://arxiv.org/abs/0811.3772
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[34]: https://arxiv.org/abs/0811.3772v1
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[35]: https://arxiv.org/show-email/a02de7f8/0811.3772
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[36]: http://arxiv.org/auth/show-endorsers/0811.3772
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[37]: javascript:setMathjaxCookie%28%29()
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[38]: https://arxiv.org/help/mathjax/
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[39]: http://arxiv.org/
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[40]: https://arxiv.org/form
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[41]: https://arxiv.org/help/contact
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[42]: https://static.arxiv.org/icons/twitter_logo_blue.png "Follow arXiv on Twitter"
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