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.
Heat Death is coming, but long after the sun vaporizes the earth and long after Vega hits the solar system head on. We have only fifty million years, although by then it will be nothing but residually radioactive spiders and cockroaches here.
I still would like to know what liberals are doing to save the universe. Global warming is so trivial next to saving the entire cosmos. Maybe if they prayed to God they might come up with an idea or two.
Heat Death is coming, but long after the sun vaporizes the earth and long after Vega hits the solar system head on.Any links to this Vega event?
lol
We should send Dennis Kucinich, Medea Benjamin, Nancy Pelosi,....on a mission to explore this serious threat to women and children. Have them report back in few billion years.
To God, “A day is as a thousand years and a thousand years is as a day”
Coincidence?
Even a cat pouncing on your keyboard can accidently format C with a success ratio of one out of 17 quintrillion and twelve pounces. That's why I keep my cat bound in chains living in a sealed Schrodinger box. If it moves, I can hear the chain clanking.
So, what do you do about the problem of spontaneous human combustion, now that you have solved feline induced BSOD?
FOTFL!
You rang?
Do you work for Microsoft marketing?
There can not be any defect in the universe. The defect is in the small but arrogant minds of some scientists.
Nope, in quality control. We don't do much.
Or change the polarity.
Strange you should ask. I actually researched that years ago and came to a conclusion:
Do not linger long when you are located at a certain latitude. I forgot how far north, but I discovered two people, separated by hundreds of miles, both auto-poofed at the same time. They were located at the identical latitude in Europe a few years ago. One was driving a VW in Germany, I think, and the other was in the wheelhouse of a ship. They both Poofed!
That's all I know.
You forgot?? You discovered how we may save thousands, er, hundreds, er, an unknown quantity of people, and then forgot! How can you look at yourself in the mirror, man?
p.s., was it anywhere near 34° 24' North?
Ditto. If (that's a big "if") there is something in that part of the Universe, its something that's simply different. Nothing in the Universe is defective in the cosmic sense. It can be different, unusual, or special. It can't be defective.
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