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Oldest light shows universe grew fast, researchers say [inflationary cosmology gets a big boost]
Houston Chronicle (www.chron.com) ^ | March 17, 2006 | Dennis O'Brien

Posted on 03/17/2006 3:46:30 AM PST by snarks_when_bored

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March 17, 2006, 12:51AM

Oldest light shows universe grew fast, researchers say

First stars arose 400 million years after big bang, not 200 million years, as once thought

By DENNIS O'BRIEN

Baltimore Sun

Scientists examining the oldest light in the universe say they've found clear evidence that matter expanded at an almost inconceivable rate after the big bang, creating conditions that led to the formation of the first stars.

Light from the big bang's afterglow shows that the universe grew from the size of a marble to an astronomical size in just a trillionth of a second after its birth 13.7 billion years ago, researchers from Johns Hopkins and Princeton universities said.

Readings from a NASA probe also show that the earliest stars formed about 400 million years after the big bang — not 200 million years afterward, as the research team once thought.

"With this new data, theories about the early universe have just taken their first exam, and they passed with flying colors," said David Spergel, a Princeton astrophysicist and co-author of the findings published Thursday.

The results are based on readings from the Wilkinson Microwave Anisotropy Probe, a robotic instrument with two telescopes that sweeps the sky every six months in an orbit a million miles from Earth.

Light from the probe also has confirmed a theory that the universe is made up mostly of dark energy, a mysterious force that continues to cause the universe's expansion, said Johns Hopkins astrophysicist Charles Bennett, the probe's principal investigator.

"This light is just invaluable. It's really the only fossil we have from that time," Bennett said.

Inflationary theorists argue that at the time of the big bang, the universe was at first microscopic. But three events changed things: fluctuations in temperature, bursts that transformed energy into matter and a rapid expansion of the universe that ultimately enabled stars and galaxies to form.

By polarizing and filtering out light from the earliest stars, the researchers were able to uncover evidence of those inflationary moments — fluctuations in brightness of the light scattered around the big bang's afterglow. "It amazes me that we can say anything about the first trillionth of a second of the universe, but we can," Bennett said.

The researchers say the findings also confirm that only 4 percent of the universe is composed of the familiar atoms that make up what we see around us.

Another 22 percent is dark matter — a gravitational force made up of cold particles — and 74 percent is dark energy, a force that appears to be causing the universe to expand.

Experts say the findings will help scientists for years as they try to unravel mysteries about the early universe.




TOPICS: Extended News; Miscellaneous; News/Current Events
KEYWORDS: bigbang; cmbr; cosmology; crevolist; earlyuniverse; inflation; physics; stringtheory; wmap
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To: RightWingAtheist
You're right about Sean Carroll's political inanity. I remember reading his take on the Summers fiasco. But he's a reasonably good writer about physics matters; I just mod out his political comments.

Predictably, Peter Woit thinks Motl has erred in his interpretation of the WMAP results...

101 posted on 03/18/2006 1:08:24 AM PST by snarks_when_bored
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To: longshadow

You've got a new pic of the CMBR data now, ls!


102 posted on 03/18/2006 1:09:48 AM PST by snarks_when_bored
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To: snarks_when_bored
"It amazes me that we can say anything about the first trillionth of a second of the universe, but we can," Bennett said.

wink, wink....

103 posted on 03/18/2006 9:36:44 AM PST by patriot_wes (papal infallibility - a proud tradition since 1869)
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To: snarks_when_bored

Thanks for the ping. :-)

Finally got here. (Late as usual, sigh.)


104 posted on 03/19/2006 1:53:48 AM PST by RadioAstronomer (Senior member of Darwin Central)
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To: snarks_when_bored
I find the following Heinlein quotation to be most useful to keep in mind when reading most science blogs (with the exception of Motl's The Reference Frame and Razib's Gene Expression, a depressing majority are by either liberals or far-left moonbats):

"For a long time I have from time to time felt exasperated with you that you should be so able to so completely to insulate your thinking in nonscientific fields from your excellent command of the scientific method in science fields. So far as I have observed you, you would no more think of going off half-cocked, with insufficient and unverified data, with respect to a matter of science than you would stroll down Broadway in your underwear. But when it comes to matters outside your specialties you are consistently and brilliantly stupid. You come out with some of the goddamndest flat-footed opinions with respect to matters which you haven't studied and have had no experience, basing your opinions on casual gossip, newspaper stories, unrelated individual data out of matrix, armchair extrapolation, and plain misinformation--unsuspected because you haven't attempted to verify it."

105 posted on 03/19/2006 12:04:31 PM PST by RightWingAtheist ( EveningStar is back; new tagline pending)
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