Dark matter/Dark Energy

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Profile Julie
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Message 1453561 - Posted: 13 Dec 2013, 15:50:24 UTC
Last modified: 13 Dec 2013, 15:51:33 UTC

According to this article, you are right Tullio.

http://arstechnica.com/science/2013/10/new-lux-experiment-no-dark-matter-in-this-corner/

Of course, this result isn't a definitive statement on the existence of dark matter, but it does put stronger constraints on what its identity could be. Dark matter could still lurk at lower mass ranges, or it could be non-WIMP in nature. The latter possibility includes the disturbing prospect that dark matter doesn't interact directly with normal matter at all, except through gravity, dooming every current detection scheme to failure.



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Message 1453585 - Posted: 13 Dec 2013, 18:08:17 UTC - in response to Message 1453561.

Julie, I stick to experimental facts. I am a physicist, even if retired, and I am against speculations.
Tullio


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Message 1453587 - Posted: 13 Dec 2013, 18:20:51 UTC
Last modified: 13 Dec 2013, 18:21:56 UTC

I understand quite well Tullio



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Message 1453608 - Posted: 13 Dec 2013, 19:48:15 UTC - in response to Message 1453585.

Julie, I stick to experimental facts. I am a physicist, even if retired, and I am against speculations.
Tullio



I had a feeling about you, Tullio. Good for you :-)

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Message 1457918 - Posted: 27 Dec 2013, 11:56:11 UTC

Two thousand years ago, a Roman vessel with ingots of lead extracted from the Sierra of Cartagena sank across the waters from the coast of Sardinia. Since 2011, more than a hundred of these ingots have been used to build the 'Cryogenic Underground Observatory for Rare Events' (CUORE), an advanced detector of neutrinos- almost weightless subatomic particles- at the Gran Sasso National Laboratory in Italy.


Use of Roman ingots in 'dark matter and neutrinos study' sparks controversy



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Message 1457946 - Posted: 27 Dec 2013, 15:33:48 UTC - in response to Message 1457918.

Some say that the decline of the Roman Empire was also due to lead poisoning because lead was used in the Roman Aqueducts, some of which are still standing, although no longer used to bring water to people.
Tullio


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Message 1458010 - Posted: 27 Dec 2013, 20:01:30 UTC - in response to Message 1457946.

The lead that caused the problems was used as makeup


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Message 1458142 - Posted: 28 Dec 2013, 8:44:20 UTC

There was also a lot of lead in the drinking cups and containers their wine was stored in. I saw also that lead made the wine taste sweeter. Whatever this has to do with dark matter or dark energy is beyond me.


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Message 1458158 - Posted: 28 Dec 2013, 10:09:53 UTC

But the amount of lead ingested by a Roman in his body would be infinitesimal. If he ate a handful every day maybe ....

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Message 1458176 - Posted: 28 Dec 2013, 11:40:00 UTC - in response to Message 1458142.

Even neutrinos have nothing to to with dark matter,leave alone dark energy.Lead is used to shield the neutrino detectors from radioactivity coming from the rocks, since neutrino detectors are situated underground or underwater as in ICECUBE.
Tullio


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Message 1461732 - Posted: 8 Jan 2014, 7:50:26 UTC

Dark Matter Search Considers Exotic Possibilities:


http://www.scientificamerican.com/article.cfm?id=dark-matter-exotic-possibilities&utm_content=buffer7d357&utm_source=buffer&utm_medium=facebook&utm_campaign=Buffer

Physicists still have no proof that dark matter exists at all, but the evidence for it is substantial. The movements of stars and galaxies can apparently be explained only if there is much more gravitating matter in the universe than the visible stuff of atoms and molecules. Attempts to correct the discrepancy by rewriting the rules of gravity in Einstein's general theory of relativity have repeatedly failed.


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Message 1461951 - Posted: 8 Jan 2014, 22:50:31 UTC - in response to Message 1461732.

Dark Matter Search Considers Exotic Possibilities:


http://www.scientificamerican.com/article.cfm?id=dark-matter-exotic-possibilities&utm_content=buffer7d357&utm_source=buffer&utm_medium=facebook&utm_campaign=Buffer

Physicists still have no proof that dark matter exists at all, but the evidence for it is substantial. The movements of stars and galaxies can apparently be explained only if there is much more gravitating matter in the universe than the visible stuff of atoms and molecules. Attempts to correct the discrepancy by rewriting the rules of gravity in Einstein's general theory of relativity have repeatedly failed.


Thanks Julie.

Just because they can't see it doesn't mean it isn't there.

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Message 1461953 - Posted: 8 Jan 2014, 22:55:01 UTC - in response to Message 1461951.

Dark Matter Search Considers Exotic Possibilities:


http://www.scientificamerican.com/article.cfm?id=dark-matter-exotic-possibilities&utm_content=buffer7d357&utm_source=buffer&utm_medium=facebook&utm_campaign=Buffer

Physicists still have no proof that dark matter exists at all, but the evidence for it is substantial. The movements of stars and galaxies can apparently be explained only if there is much more gravitating matter in the universe than the visible stuff of atoms and molecules. Attempts to correct the discrepancy by rewriting the rules of gravity in Einstein's general theory of relativity have repeatedly failed.


Thanks Julie.

Just because they can't see it doesn't mean it isn't there.



I know Lynn, we're unraveling bits by bits...

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Message 1461958 - Posted: 8 Jan 2014, 23:14:21 UTC - in response to Message 1461953.

Dark Matter Search Considers Exotic Possibilities:


http://www.scientificamerican.com/article.cfm?id=dark-matter-exotic-possibilities&utm_content=buffer7d357&utm_source=buffer&utm_medium=facebook&utm_campaign=Buffer

Physicists still have no proof that dark matter exists at all, but the evidence for it is substantial. The movements of stars and galaxies can apparently be explained only if there is much more gravitating matter in the universe than the visible stuff of atoms and molecules. Attempts to correct the discrepancy by rewriting the rules of gravity in Einstein's general theory of relativity have repeatedly failed.


Thanks Julie.

Just because they can't see it doesn't mean it isn't there.



I know Lynn, we're unraveling bits by bits...


Understood Julie.

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Message 1461959 - Posted: 8 Jan 2014, 23:17:35 UTC - in response to Message 1461958.

New Cosmic Distance Measurement Points the Way to Elusive Dark Energy


NATIONAL HARBOR, Md.— More galaxies are separated by 450 million light-years than by any other large distance, astronomers have found in the most precise measurement yet of this key cosmic length scale. Using this scale, researchers calculated astronomical distances with a record low level of 1 percent uncertainty in a measurement that helps clarify what is behind the unexplained dark energy causing the universe's expansion to accelerate.

Astronomers have measured a distance scale in the universe to unprecedented accuracy, opening the door to better tests of dark energy models than ever before.

http://www.scientificamerican.com/article.cfm?id=dark-energy-cosmic-distances
New Cosmic Distance Measurement Points the Way to Elusive Dark Energy

Good!


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Message 1466469 - Posted: 20 Jan 2014, 1:17:04 UTC - in response to Message 1461959.

strange...

By illuminating dark matter with quasar light from around a super-massive black hole, astronomers have seen for the first time ever the strands that constitute a cosmic web and hold the universe together. Scientists in the US and Germany have been able to confirm what has long been suspected, but only before “observed” via computer simulations. Filaments or threads of dark matter have long been presumed to link together the phenomenal voids across intergalactic space. As these don’t emit light though, they have not been possible to see.

http://guardianlv.com/2014/01/the-skeleton-of-the-universe-illuminated/


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Message 1466494 - Posted: 20 Jan 2014, 2:57:17 UTC - in response to Message 1466469.

strange...

By illuminating dark matter with quasar light from around a super-massive black hole, astronomers have seen for the first time ever the strands that constitute a cosmic web and hold the universe together. Scientists in the US and Germany have been able to confirm what has long been suspected, but only before “observed” via computer simulations. Filaments or threads of dark matter have long been presumed to link together the phenomenal voids across intergalactic space. As these don’t emit light though, they have not been possible to see.

http://guardianlv.com/2014/01/the-skeleton-of-the-universe-illuminated/

I saw that today on Yahoo news. Was watching a program on the subject Saturday night. It struck me that the big picture view of the universe looks a lot like the maps of the human brain.
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 1466611 - Posted: 20 Jan 2014, 11:24:27 UTC

Interesting article on Dark Magnetism:

http://thediagonal.com/2012/06/10/mutant-gravity-and-dark-magnetism/



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Message 1487250 - Posted: 11 Mar 2014, 1:26:35 UTC - in response to Message 1466611.

hmmm?


Dark Matter Disk Could Have Killed Dinosaurs, Scientists Say


A thin disk of dark matter running through the Galaxy might be behind the large meteorite strikes that are thought to be responsible for some of Earth’s mass extinctions, including that of the dinosaurs, two theoretical physicists have proposed.


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Message 1487311 - Posted: 11 Mar 2014, 4:49:44 UTC

I guess that is as good an explanation as some I have heard. I also have heard that these events occur when the track of our solar system passes through the plane of the galaxy or when a rouge star passes through the outer edge of the oort cloud disturbing the orbits of comets.


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 boards : Science (non-SETI) : Dark matter/Dark Energy


 
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