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Message boards : Cosmology and Astronomy : Universe Expanding Faster Than Previously Thought?

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rbpeake
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Message 21083 - Posted: 2 Jun 2016, 16:24:52 UTC

Sounds like this result is stirring the cosmology pot!

http://hubblesite.org/newscenter/archive/releases/2016/17/

Profile Marius
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Message 21084 - Posted: 2 Jun 2016, 18:37:24 UTC - in response to Message 21083.
Last modified: 2 Jun 2016, 18:37:55 UTC

I'm glad you posted this, their result is indeed of major interest in cosmology and is stirring the pot a bit. And actually, its in some ways very related to the planck_param_sims jobs.

Like it says in the article,

Comparing the universe's expansion rate with WMAP, Planck, and Hubble is like building a bridge, Riess explained. On the distant shore are the cosmic microwave background observations of the early universe [Planck & WMAP]. On the nearby shore are the measurements made by Riess' team using the Hubble satellite.

"You start at two ends, and you expect to meet in the middle if all of your drawings are right and your measurements are right," Riess said. "But now the ends are not quite meeting in the middle and we want to know why."

Putting numbers to it, the Hubble constant inferred from the Planck data, 67.3 km/s/Mpc, is a bit different than what they find, 73.2 km/s/Mpc, and the difference could point to an important new discovery if it holds up. Given the hints in this discrepancy of something new we don't understand, with the planck_param_sims jobs we're also looking at if internally just within different subsets of the Planck data there might be hints also.

If you look through the logs of any of your planck_param_sims jobs (for example from one of your jobs, rbpeake), you'll find something that looks like

'cosmo.H0': 61.873811692273257

This means that for the particular simulation of the universe and the particular subset of the Planck data that that job corresponds to, we found a Hubble constant of 61.9 km/s/Mpc, so pretty low. Of course, other times it will randomly scatter high, and with the millions of jobs you guys have run we can build up a distribution and get a sense of if the different subsets of Planck data agree as well as they should.

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Message 21085 - Posted: 3 Jun 2016, 15:45:45 UTC - in response to Message 21084.

Thanks so much for the great update!

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Message 21311 - Posted: 8 Feb 2017, 16:44:38 UTC

As a believer of the empirical AND spiritual world (Grand Unified Theorem), I believe that dark energy is the result of negative emotions, coming from biological bodies. Our brain has much more influence on the universe than we think. The accelerated expansion of the universe is the result of negative emotions, having the upperhand at this moment in our evolution. If we all learn to live in a peaceful way, with peaceful minds, my opinion is that the acceleration will reduce.

Message boards : Cosmology and Astronomy : Universe Expanding Faster Than Previously Thought?