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Hubble yardstick gives fresh evidence for new physics 888

 
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Savor



Joined: 02 Jan 2007
Posts: 1859

PostPosted: 23.02.2018 11:17    Post subject: Hubble yardstick gives fresh evidence for new physics 888 Reply with quote

Improved Hubble yardstick gives fresh evidence for new physics in the universe

https://m.phys.org/news/2018-02-hubble-yardstick-fresh-evidence-physics.html

"Explaining a Vexing Discrepancy

Riess outlined a few possible explanations for the mismatch, all related to the 95 percent of the universe that is shrouded in darkness. One possibility is that dark energy, already known to be accelerating the cosmos, may be shoving galaxies away from each other with even greater - or growing - strength. This means that the acceleration itself might not have a constant value in the universe but changes over time in the universe. Riess shared a Nobel Prize for the 1998 discovery of the accelerating universe.

Another idea is that the universe contains a new subatomic particle that travels close to the speed of light. Such speedy particles are collectively called "dark radiation" and include previously known particles like neutrinos, which are created in nuclear reactions and radioactive decays. Unlike a normal neutrino, which interacts by a subatomic force, this new particle would be affected only by gravity and is dubbed a "sterile neutrino."

Yet another attractive possibility is that dark matter (an invisible form of matter not made up of protons, neutrons, and electrons) interacts more strongly with normal matter or radiation than previously assumed.

Any of these scenarios would change the contents of the early universe, leading to inconsistencies in theoretical models."

Tämä on jo selvitetty asia.

Ei tarvita massiivisia voimia työntämään galaksijoukkoja pois päin toisistansa.

Valo venyy eli yleisesti punasiirtyy koska laajenevan valon aallot vuorovaikuttavat toistensa kanssa uusi valo vähän vanhaa valoa nopeampana, kiihdyttää vanhan valon vauhtia, jolloin se venyy eli yleisesti punasiirtyy itse avaruudessa liikkuessaan.

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Last edited by Savor on 27.03.2018 14:20; edited 1 time in total
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Savor



Joined: 02 Jan 2007
Posts: 1859

PostPosted: 27.03.2018 14:20    Post subject: Reply with quote

"Planck's result predicted that the Hubble constant value should now be 67 kilometers per second per megaparsec (3.3 million light-years), and could be no higher than 69 kilometers per second per megaparsec. This means that for every 3.3 million light-years farther away a galaxy is from us, it is moving 67 kilometers per second faster. But Riess's team measured a value of 73 kilometers per second per megaparsec, indicating galaxies are moving at a faster rate than implied by observations of the early universe.

The Hubble data are so precise that astronomers cannot dismiss the gap between the two results as errors in any single measurement or method. "Both results have been tested multiple ways, so barring a series of unrelated mistakes," Riess explained, "it is increasingly likely that this is not a bug but a feature of the universe.""

https://m.phys.org/news/2018-02-hubble-yardstick-fresh-evidence-physics.html

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