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Old 25-October-2007, 11:46 PM
Fortunate Fortunate is offline
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Default Cosmic Defect Discovered, Remnant From Big Bang?

The title of the thread should read Possible Cosmic Defect Discovered,....
but I don't know how to change the title. Sorry for the bait and switch.

Quote:
Scientists from the Institute of Physics of Cantabria (IFCA) and the University of Cambridge may have discovered an example of a cosmic defect, a remnant from the Big Bang called a texture. If confirmed, their discovery, reported today in Science, will provide dramatic new insight into how the universe evolved following the Big Bang.
http://www.physorg.com/news112541069.html

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There are a number of follow-up tests which can be made with future data. It's a very testable hypothesis and we will know the answer within the next decade.

Last edited by Fortunate; 26-October-2007 at 12:07 AM.
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Old 25-October-2007, 11:50 PM
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This provides a second proposed explanation for the WMAP cold spot. We also have the work of Rudnick et al.

Huge Hole Found in the Universe
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Old 26-October-2007, 12:09 AM
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Interesting! I'd like to hear what the follow-up tests are.
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Old 26-October-2007, 12:14 AM
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Hmmm, I always hear "Ghost Hunters" and the like saying that anomalous cold spots are "evidence" of ghosts. I wonder, could there be "microtextures" hanging around a palnet's* surface?

*Or a planet's, for that matter?
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Last edited by Noclevername; 26-October-2007 at 12:16 AM. Reason: You don't have the need-to-know for that answer.
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Old 26-October-2007, 12:19 AM
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Quote:
Originally Posted by Cougar View Post
Interesting! I'd like to hear what the follow-up tests are.
Me too. I'll try to find out.
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Old 26-October-2007, 05:28 PM
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I follow that misalignments in the symmetry-breaking pattern will likely form some kind of cosmic defects, BUT....

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Originally Posted by The Article
It is believed that textures collapse and unwind on progressively larger scales, creating intense energy as well as gravitational potential. This unwinding also creates areas of extreme cold or hot, such as the very cold spot in the South Galactic Hemisphere discovered by the IFCA team in 2004.
This resulting "intense energy" is not all that obvious....
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Old 02-November-2007, 03:29 AM
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So, can we take it back and get our money back? Didn't this Universe come with any kind of warranty

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Old 11-November-2007, 07:56 PM
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Quote:
Originally Posted by Cougar View Post
Interesting! I'd like to hear what the follow-up tests are.
Quote:
Me too. I'll try to find out.
I have a copy of the article from Science.
1. The authors' analysis is consistent with a texture which unwound at about z=6, "after reionization...and potentially within reach of very deep galaxy or quasar surveys."
2. The authors claim that in their texture plus Gaussian CMB model, the spot would have been caused by a "time-dependent gravitational potential" and we would not see any "associated CMB polarization" whereas if the spot is a "rare statistical fluctuation in the primordial density", they would expect us to see a "radial pattern" of polarization around the spot.
3. They expect there to be "many smaller texture spots" which, again, could be distinguished from CMB density fluctuations by studying polarization.
4. They claim that a texture at z=6 would gravitationally lens objects behind it and also "lens the second-order CMB anisotopies."
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Old 14-December-2007, 07:37 PM
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http://www.osti.gov/energycitations/...sti_id=5929446

http://www.sciencedaily.com/releases...1025143314.htm

"It is believed that textures collapse and unwind on progressively larger scales, creating intense energy as well as gravitational potential."
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Old 15-December-2007, 07:56 PM
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Cool interesting

Interesting...."current data is suggestive but not yet compelling"...at least they are proposing further tests.Should make for some coffee talk over the winter meetings.
Are we now to assume that the vacuum with it's permanent "defects" is no longer Lorentz invariant, and that we can expect in our travails along the spiral arms of the Milky Way, to run into some defects, too?...that might be seen in a particle physics detector? Perhaps a predictable violation of conservation laws will occur?...or a new wrinkle in Special Relativity? That'd be nice for Christmas.
There is as yet, still, the old data showing roughly twice as many galaxies per square degree of sky in the Southern Hubble Deep Field as opposed to the Northern Deep Field, with as yet no commensurate doubling of missing dark matter to boot, though the two are said to be gravitationally in cahoots. One might surmise that we are two thirds of the way across some universal diameter, to accomodate the galaxy count difference,but that ought too, bring with it a doubling of dark matter,and a "bump" in the distribution of fainter galaxies unless Southern galaxy rotation profiles are distinctly different from Northern ones........be careful of things that go bump in the night.
catch a falling star,...pete
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Last edited by trinitree88; 15-December-2007 at 07:59 PM. Reason: clarity
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Old 04-March-2008, 10:57 PM
BISMARCK BISMARCK is offline
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This link mentions a physicist that claims the WMAP Cold Spot may be some sort of evidence of another universe "imprinting" itself on our universe.

I'm not clear about exactly what that means.
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Old 05-March-2008, 12:48 AM
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Old 08-March-2008, 04:58 AM
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Default CMB Cold Spots?

This paper provides data that indicates there are cold spots rather than cold spot.

“The mystery of the WMAP cold spot”

http://arxiv.org/abs/0712.1118
Quote:
We find that, unlike its Northern counterpart, the Southern Galactic hemisphere of the CMB map is characterized by significant departure from Gaussianity of which the CS is not the only manifestation: we have located a ring, on which there are “cold” as “hot” spots with almost the same properties as the CS. Exploiting the similarity of the WCM and the ILC maps, and using the latter as a guide map, we have discovered that the shape of the CS is formed primarily by the components of the CMB signal represented by multipoles between 10 ≤ ℓ ≤ 20, with a corresponding angular scale about 5−10◦. This signal leads to modulation of the whole CMB sky, clearly seen at |b| > 30◦ in both the ILC and WCM maps, rather than a single localized feature. After subtraction of this modulation, the remaining part of the CMB signal appears to be consistent with statistical homogeneity and Gaussianity. We therefore infer that the mystery of the WMAP CS reflects directly the peculiarities of the low-multipole tail of the CMB signal, rather than
a single local (isolated) defect or manifestation of a globally anisotropic cosmology.
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Old 08-March-2008, 04:54 PM
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Quote:
Originally Posted by Bearded One View Post
So, can we take it back and get our money back? Didn't this Universe come with any kind of warranty

Perhaps we should check to see if there's been any service packs released that would provide a fix for it.
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Old 08-March-2008, 08:35 PM
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"We apologize for the inconvenience"
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Old 01-July-2008, 12:09 AM
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Could you land on a small enough texture?
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