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Posted on 10/25/2007 5:34:21 PM PDT by Nasty McPhilthy
An enormous cold spot in our universe could be explained by a cosmic defect in the fabric of space-time created shortly after the Big Bang, scientists say.
If confirmed by future studies, the finding, detailed in the Oct. 25 issue of the journal Science, could provide cosmologists with a long-sought clue about how the infant universe evolved.
But other scientists, and even members of the study team, are skeptical of the new claim.
Cosmic ice cubes
Scientists think that shortly after the Big Bang, as the universe cooled and expanded, exotic particles transformed into the particles we know today via phase transitions similar to the gas-liquid-solid transitions that matter now experiences on Earth.
And like phase transitions on Earth, defects inevitably occur. When water crystallizes to ice, for example, cloudy spots appear in the ice that mark where water molecules are misaligned. Physicists predict that similar defects happened during the phase transitions of the early universe, and that the defects took different forms.
The team thinks a cold spot in the cosmic microwave background (CMB)—an energy artifact of the Big Bang that has been detected and mapped by NASA's Wilkinson Microwave Anisotopy Probe (WMAP) satellite—represents the most complex kind of cosmic defect, a 3-D blob-like structure called a texture.
Marcos Cruz of the Instituto de Fisica de Cantabria in Spain and colleagues analyzed the CMB cold spot, which spans 1 billion light-years across, finding it had properties consistent with a texture.
"The cosmic microwave background is the most ancient image we have of the universe, and therefore it's one of the most valuable tools to understand the universe's origins," Cruz said. "If this spot is a texture, it would allow us to discriminate among different theories that have been proposed for how the universe evolved."
'Not compelling'
Other scientists say the team's case for a cosmic defect is still weak. "It would be spectacular, and a new handle on the early universe, if this cold spot turned out to be a texture as opposed to a random fluctuation, which is perhaps a more likely explanation," said Lyman Page, a WMAP team member at Princeton University who was not involved in the study.
Liliya Williams and Lawrence Rudnick, astronomers at the University of Minnesota, recently attributed the CMB cold spot not to a cosmic defect, but to an enormous "hole" in our galaxy, devoid of stars, gas and even dark matter, a mysterious substance thought to pervade the universe but which has so far eluded direct detection.
A "cosmic defect is an intriguing and plausible explanation. However, I don't think one can dismiss a void as the cause of the CMB cold spot," Williams said in an e-mail interview. "Whatever the correct interpretation will turn out to be, it is bound to open a new window on the early universe, but what we'll see through that window is still not clear."
Study team member Neil Turok of the University of Cambridge admits his team's case is "not at all compelling" at the moment. The cold spot could be a texture, but there is a 1 percent probability it is just a random temperature fluctuation in the CMB.
"What makes this so interesting is that there are a number of follow-up checks, which can now be done," Turok said. "So the texture hypothesis is actually very testable."
A cosmic texture would cause light passing through it to bend and point in certain ways that should be detectable by future space missions, Turok said.
He is is he? Who exactly is Eddie then?
This goes a long way towards explaining Dennis Kucinich.
Not me. I trained people to not make me mad in the first place. And I don't make them mad. That's the trick. We ask each other to do things.
BTW, I know a guy that worked in Redondo Beach for 25 years. He retired with $1 Mil at 58 and nobody knew what he did there. That's how to do it.
Thank you. I was beginning to think all the Douglas Adams fans had packed up and left.
Just throw an extra Stargate into the sun. Worked for SG-1.
..Someone might want to mention this to RadioAstronomer if he is still at "the other site" and hasn't already read it ;-)
Cheers!
That's what you get when you outsource God's job to illegal alien scientists. ;)
Oh great! I bet I cant understand what they are saying on their customer support line either.
Me: Yes...hello? I want to talk about this tear in my space time continuem?...hello?
CS: Yes. Thes es errotic teenage AMERICAN Gerls. Would you be liking me to talk dirty to you?
Me: What?!!
CS: OOHH! Wrong line. Yes, this is the space-time continuem hotline. How may I be helping you?
Not until they find the “newcwear wessels”.
I heard he's looking for his sofa.
Sorry, that universe, being nondefective, built a wall along the demensional border to keep out all illegal immigrant demension hoppers (warp-backs)
Double dumb a$$ on him.
A meeting on required sexual harrassment? You worked for the Clinton administration? Cool!
I had thought the problem was due to a black hole.
Why?
Black holes suck!
thanks, bfl
Didn’t I see this movie on the Sci-Fi channel?
And always use “Woolite Dark” for black holes.
Oh well. Nobody’s perfect.
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