# How do we know that matter dominates our universe?

**URL:** https://boards.straightdope.com/t/how-do-we-know-that-matter-dominates-our-universe/645364
**Category:** Factual Questions
**Created:** [December 28, 2012, 7:41am UTC](https://boards.straightdope.com/t/how-do-we-know-that-matter-dominates-our-universe/645364 "2012-12-28T07:41:26Z")
**Posts on this page:** 1
**Showing post:** 21

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### Author: ![Pasta](https://avatars.discourse-cdn.com/v4/letter/p/ecccb3/32.png) [@Pasta](https://boards.straightdope.com/u/Pasta)
#### Post date: [January 2, 2013, 4:04am UTC](https://boards.straightdope.com/t/how-do-we-know-that-matter-dominates-our-universe/645364/21 "2013-01-02T04:04:01Z")

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> [@Chronos](#):
>
> Is the 1-2 mixing angle still believed to be (about) 45 degrees? That’s the most recent information I have on the topic.

In the typical parametrization, it’s the 2-3 angle that’s near 45 degrees. 45 degrees is still within the 1-sigma-ish allowed range, but the latest results from this past summer have interestingly shifted the best-fit away from maximal mixing (or, rather, sin[sup]2[/sup](2[this angle]) has a best-fit value slightly away from unity).

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