Dark matter/Dark Energy

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Profile William Rothamel
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Message 1783510 - Posted: 29 Apr 2016, 15:56:53 UTC - in response to Message 1783357.  

Yes:

Maybe it is slowing down. What we see at the edge of the visible horizon was what was happening 13 billion years ago when acceleration was faster?

What do you say ?
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Profile Bob DeWoody
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Message 1783560 - Posted: 29 Apr 2016, 19:57:34 UTC

I say we most likely have less than 10% of the information needed to discover the true nature of the universe. Especially since most of it is made of stuff we call dark energy and dark matter which are names that have been assigned to components we know little or nothing about.
Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.
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Profile tullioProject Donor
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Message 1790310 - Posted: 25 May 2016, 17:49:30 UTC
Last modified: 25 May 2016, 17:53:26 UTC

A NASA scientist says that dark matter could consist of black holes created in the first second after the Big Bang. This because the lumpiness of the X radiation detected by the Chandra telescope corresponds to that of the cosmic infrared background, pointing to a common cause. The argument is discussed on the NASA site and the idea is contained in an article published on May 24 in Astrophysical Journal Letters.
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Message 1790330 - Posted: 25 May 2016, 18:55:21 UTC - in response to Message 1790310.  

A NASA scientist says that dark matter could consist of black holes created in the first second after the Big Bang. This because the lumpiness of the X radiation detected by the Chandra telescope corresponds to that of the cosmic infrared background, pointing to a common cause. The argument is discussed on the NASA site and the idea is contained in an article published on May 24 in Astrophysical Journal Letters.
Tullio


Interesting. Thanks for posting this tullio. :)
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Message 1802594 - Posted: 14 Jul 2016, 21:25:02 UTC - in response to Message 1790330.  

They don't know anything.

Biggest galactic map will throw light on 'dark energy'

An international team of astronomers has created the largest ever three-dimensional map of distant galaxies in a bid to help them understand one of the most mysterious forces in the universe.

Scientists including a team led by Dr Florian Beutler at the University of Portsmouth's Institute of Cosmology and Gravitation have spent a decade collecting measurements of 1.2 million galaxies as part of the Sloan Digital Sky Survey III (SDSS-III).

http://phys.org/news/2016-07-biggest-galactic-dark-energy.html
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Message 1803996 - Posted: 21 Jul 2016, 21:39:37 UTC - in response to Message 1802594.  

Dark matter still MIA after most exhaustive search yet. :-)

Scientists Looking for Invisible Dark Matter Can't Find Any

Scientists have come up empty-handed in their latest effort to find elusive dark matter, the plentiful stuff that helps galaxies like ours form.

For three years, scientists have been looking for dark matter — which though invisible, makes up more than four-fifths of the universe's matter — nearly a mile underground in a former gold mine in Lead, South Dakota. But on Thursday they announced at a conference in England that they didn't find what they were searching for, despite sensitive equipment that exceeded technological goals in a project that cost $10 million to build.

http://abcnews.go.com/Technology/wireStory/scientists-invisible-dark-matter-find-40767195
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Message 1804105 - Posted: 22 Jul 2016, 6:26:16 UTC - in response to Message 1803996.  
Last modified: 22 Jul 2016, 6:27:36 UTC

Dark matter still MIA after most exhaustive search yet. :-)

Scientists Looking for Invisible Dark Matter Can't Find Any

Scientists have come up empty-handed in their latest effort to find elusive dark matter, the plentiful stuff that helps galaxies like ours form.

For three years, scientists have been looking for dark matter — which though invisible, makes up more than four-fifths of the universe's matter — nearly a mile underground in a former gold mine in Lead, South Dakota. But on Thursday they announced at a conference in England that they didn't find what they were searching for, despite sensitive equipment that exceeded technological goals in a project that cost $10 million to build.

http://abcnews.go.com/Technology/wireStory/scientists-invisible-dark-matter-find-40767195

Well, they haven't found God either, so maybe God is dark matter, or dark matter is God.

I really don't know if I should put a smiley after that statement, or not....
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Message 1804125 - Posted: 22 Jul 2016, 12:11:47 UTC - in response to Message 1804105.  

Well, they haven't found God either, so maybe God is dark matter, or dark matter is God.
I really don't know if I should put a smiley after that statement, or not....

Well, they found the God Damn Particle AKA Higg's Boson after many years.
Dark matter particles however...
If not found probably the Standard Model will have to go.
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Message 1804235 - Posted: 22 Jul 2016, 18:17:54 UTC - in response to Message 1804125.  

Well, they haven't found God either, so maybe God is dark matter, or dark matter is God.

I really don't know if I should put a smiley after that statement, or not....

Sorry about that. Bad habit.
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Message 1805114 - Posted: 27 Jul 2016, 14:18:28 UTC

The Standard Model does not include Dark Matter. Recently there was a suspicion of a 750 GeV particle also not foreseen by the Standard Model, but it seems to have disappeared.
Tullio
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Message 1805283 - Posted: 28 Jul 2016, 5:54:39 UTC

$10 million to go look down a deep dark hole and look for something that apparently can't be detected or isn't there to start with. And all to make their math look correct. I did that once on a math problem I couldn't solve. I just added an X at the end of my incorrect answer. When asked by my professor what the X stood for I responded that it was the number needed to multiply my answer by to get the correct answer. The professor laughed and then gave me a zero fo that part of the exam.
Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.
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Message 1805310 - Posted: 28 Jul 2016, 10:52:09 UTC
Last modified: 28 Jul 2016, 10:53:04 UTC

In 1936 astronomer Fritz Zwicki, studying the dynamics of spiral galaxies,spoke of "missing mass" needed to maintain them in that shape. Now it is called "dark matter" and nobody knows what it is made of, despite many efforts to detect it, including the AMS-02 magnetic spectrometer on the ISS.
Tullio
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Profile William Rothamel
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Message 1805329 - Posted: 28 Jul 2016, 13:20:34 UTC - in response to Message 1805310.  
Last modified: 28 Jul 2016, 13:22:57 UTC

We may all have to rethink my old pal Johnney Guinness' supposition that dark matter does not exist --at least in the way that we think of matter.

Fritz Zwicky also put forth (now discredited) the theory of "Tired Light" I wonder if Fritz's results in this instance assumed a non-rotating space--rotating perhaps in an unseen dimension ??
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Message 1805452 - Posted: 28 Jul 2016, 23:01:11 UTC - in response to Message 1805329.  

Can dark matter be in surrounding black holes?
Black holes pulls in matter. Maybe why it can't be detected.
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Message 1805520 - Posted: 29 Jul 2016, 6:32:56 UTC
Last modified: 29 Jul 2016, 6:40:26 UTC

The search of dark matter is for now to find particles that somehow have the same property having a gravity as normal matter does.
But many scientist thinks that gravity is an illusion.
That gravity is only the curvature in spacetime.
Couldn't the curvature in spacetime already been created in the Bing Bang?
Like the WMAP showing us that the universe is not homogen?
Galaxies forming like they do forming clusters inside the dark matter's "gravitational pull"/"space time curvature".
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Message 1805589 - Posted: 29 Jul 2016, 14:29:42 UTC - in response to Message 1805520.  

So far as I know. All people educated in the sciences consider gravity to be a warpage of space and the effect of objects moving down to their lowest level of potential energy. Considering it to be a Force governed by two masses and a universal constant also works for many large scale observations and measurements.
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Message 1805610 - Posted: 29 Jul 2016, 16:12:47 UTC

Heck, maybe dark matter is almost naked singularities that are now so small that they only have one quark in them and they can't evaporate all the way. Saying their hole size is now so small that they can't eat a particle because all particles are larger than the hole they must fall into.
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Message 1805895 - Posted: 30 Jul 2016, 17:17:09 UTC

The July/August issue of CERN Courier is dedicated to neutrino physics. The suggestion By Bruno Pontecorvo that neutrinos can oscillate between three flavors, the electron neutrino, the muon neutrino and the tau neutrino, has been vindicated by the experiments. This implies that neutrinos have a mass, which has not been measured so far. There are so many of them that even a very small mass (about 1 eV) could make a sizable total mass. What if dark matter is made up from neutrinos? They are Weakly Interacting Massive Particles after all.
Tullio
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Message 1805896 - Posted: 30 Jul 2016, 17:35:38 UTC - in response to Message 1805895.  
Last modified: 30 Jul 2016, 17:35:50 UTC

Though I don't know where I got the number--I had some time back on these forums predicted a neutrino mass 0f 40 Ev
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Message 1805920 - Posted: 30 Jul 2016, 21:03:39 UTC - in response to Message 1805896.  
Last modified: 30 Jul 2016, 21:15:17 UTC

Looks like scientists still don't know the mass of neutrinos.
The KATRIN experiment will search for a mass between 0.2 eV and 2 eV.
Most of the universe´s matter density is in the form of -unknown- dark matter or dark energy. One candidate for dark matter -the only known so far- are massive neutrinos. Even with masses as small as 3 eV/c2 they could make up about 20% of the universe´s mass.

http://www.katrin.kit.edu/77.php
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Message boards : Science (non-SETI) : Dark matter/Dark Energy


 
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