Super-Sensors to Measure 'Signature' of Inflationary Universe (w/Video)

May 03, 2009
Micrograph of a prototype NIST detector that will be used to seek B-mode polarization, the signature of the rapid inflation of the universe after the Big Bang. Cosmic radiation will be received by the arrow-shaped antennas in the middle of the detector. The antennas separate the radiation into two different polarization directions at a frequency of 145 gigahertz. (All light has two polarization directions.) Finally, the radiation for each polarization will be converted to heat by transition-edge sensors (top and right sides of the image), which precisely measure the energy using a superconducting metal that changes resistance in response to heat. The resulting data will be mapped to identify the polarization patterns. Credit: NIST

What happened in the first trillionth of a trillionth of a trillionth of a second after the Big Bang? Super-sensitive microwave detectors, built at the National Institute of Standards and Technology, may soon help scientists find out.

The new sensors, described today at the American Physical Society (APS) meeting in Denver*, were made for a potentially ground-breaking experiment by a collaboration involving NIST, Princeton University, the University of Colorado at Boulder, and the University of Chicago.

This video is not supported by your browser at this time.
What happened in the first trillionth of a trillionth of a trillionth of a second after the Big Bang? Super-sensitive microwave detectors may soon help scientists find out.

Although NIST is best known for earthbound measurements, a long-standing project at NIST's Boulder campus plays a critical role in the study of the cosmic microwave background (CMB)--the faint afterglow of the that still fills the universe. This project previously built superconducting amplifiers and cameras for CMB experiments at the , in balloon-borne observatories, and on the Atacama Plateau in Chile.

The new experiment will begin approximately a year from now on the Chilean desert and will consist of placing a large array of powerful NIST sensors on a telescope mounted in a converted shipping container.

The detectors will look for subtle fingerprints in the CMB from primordial gravitational waves—ripples in the fabric of space-time from the violent birth of the universe more than 13 billion years ago. Such waves are believed to have left a faint but unique imprint on the direction of the CMB's electric field, called the "B-mode polarization." These waves—never before confirmed through measurements—are potentially detectable today, if sensitive enough equipment is used.

"This is one of the great measurement challenges facing the scientific community over the next 20 years, and one of the most exciting ones as well," said Kent Irwin, the NIST physicist leading the project.

If found, these waves would be the clearest evidence yet in support of the "inflation theory," which suggests that all of the currently observable universe expanded rapidly from a subatomic volume, leaving in its wake the telltale cosmic background of gravitational waves.

"The B-mode polarization is the most significant piece of evidence related to inflation that has yet to be observed," said Ki Won Yoon, a NIST postdoctoral scholar who will describe the project at the APS meeting. "A detection of primordial gravitational waves through CMB polarization would go a long way toward putting the inflation theory on firm ground."

The data also could provide scientists with insights into different string theory models of the universe and other "unified" theories of physics.

These types of experiments can only be done by studying the universe as a whole, because the particles and electromagnetic fields at the beginning of the inflationary epoch were roughly 10 billion times hotter than the energies attainable by the most powerful particle colliders on Earth today. At this energy scale, fundamental forces now identified as separate are predicted to merge.

"The universe is a physics lab," Irwin said. "If you look far away, you are actually looking back in time, potentially observing interactions that occurred at energy levels forever out of reach of terrestrial experiments."

Recent studies of the CMB have focused on measuring slight spatial variations in temperature or power that existed about 380,000 years after the Big Bang. These patterns of radiation allow scientists to characterize the early distributions of matter and energy that evolved into the stars and galaxies of today.

By comparing the measurements to predictions made by various theories, scientists have added to the authoritative history of the universe, narrowing down, for instance, its age (13.7 billion years).

By contrast, the new NIST detectors are designed to measure not only temperature but also the polarization. The B-mode polarization signals may be more than a million times fainter than the temperature signals.

To detect such subtle patterns, the NIST detectors will collect significant amounts of radiation efficiently, and will be free of moving parts and traditional sources of systematic error, such as vibration and magnetic interference, Irwin said. In addition, advanced signal processing and error control will be needed.

The new sensors are prototypes for NIST polarimeter arrays that will greatly increase the sensitivity of future experiments by building thousands of detectors into monolithic units that can be deployed in cryogenic telescope cameras. The new NIST detectors may also have applications closer to home, such as in reducing glare in advanced terahertz imaging systems for detecting weapons and contraband.

*Atacama B-mode Search (ABS): Scientific Motivations and Design Overview, Sheraton Denver Hotel, Plaza Court 2, Saturday, May 2, 2009, 1:30 - 1:42 p.m.

Source: National Institute of Standards and Technology (news : web)

Explore further: Watching the structure of glass under pressure

add to favorites email to friend print save as pdf

Related Stories

New Satellite Data On Universe's First Trillionth Second

Mar 16, 2006

Scientists peering back to the oldest light in the universe have new evidence to support the concept of inflation. The concept poses the universe expanded many trillion times its size in less than a trillionth ...

Cosmologists aim to observe first moments of universe

Feb 16, 2009

During the next decade, a delicate measurement of primordial light could reveal convincing evidence for the popular cosmic inflation theory, which proposes that a random, microscopic density fluctuation in ...

Researchers interpret asymmetry in early universe

Dec 16, 2008

(PhysOrg.com) -- The Big Bang is widely considered to have obliterated any trace of what came before. Now, astrophysicists at the California Institute of Technology (Caltech) think that their new theoretical ...

A Simpler Design for X-Ray Detectors

Sep 28, 2004

A simplified design for ultra-sensitive X-ray detectors offering more precise materials analysis has been demonstrated at the National Institute of Standards and Technology (NIST). The advance is a step toward making such devices cheaper and easie ...

Recommended for you

What time is it in the universe?

2 hours ago

Flavor Flav knows what time it is. At least he does for Flavor Flav. Even with all his moving and accelerating, with the planet, the solar system, getting on planes, taking elevators, and perhaps even some ...

Watching the structure of glass under pressure

20 hours ago

Glass has many applications that call for different properties, such as resistance to thermal shock or to chemically harsh environments. Glassmakers commonly use additives such as boron oxide to tweak these ...

Inter-dependent networks stress test

23 hours ago

Energy production systems are good examples of complex systems. Their infrastructure equipment requires ancillary sub-systems structured like a network—including water for cooling, transport to supply fuel, and ICT systems ...

Explainer: How does our sun shine?

Aug 28, 2014

What makes our sun shine has been a mystery for most of human history. Given our sun is a star and stars are suns, explaining the source of the sun's energy would help us understand why stars shine. ...

User comments : 7

Adjust slider to filter visible comments by rank

Display comments: newest first

deatopmg
not rated yet May 03, 2009
and if the polarization is not detected, what then?
frajo
1 / 5 (3) May 03, 2009
and if the polarization is not detected, what then?

B-mode polarization is predicted by the inflationary model but not by the (string theory based) cyclic model (aka ekpyrotic model) of the universe. If it turns out that there's no B-mode but only E-mode polarization in the CMB then "it would push inflationary proponents into a corner where they would have to introduce further special fine-tunings".
Upto now the WMAP analysis results show that the gravitational wave contribution to hot and cold spots of the CMB is less than 28%.
frajo
1 / 5 (3) May 03, 2009
I'm fascinated - what's the intellectual constitution of that guy who rated this article about the most fascinating question of contemporary physics with one point only?
dogma
not rated yet May 03, 2009
His intellectual constitution is equal to his rating, squared.
rwinners
1 / 5 (1) May 04, 2009
Come on! Talk about speculative. We really don't know if there was a beginning or not, nor whether the 'beginning' we postulate was just an event in a never ending universe.
In short, who cares?
deatopmg
1 / 5 (1) May 04, 2009
Come on! Talk about speculative. We really don't know if there was a beginning or not, nor whether the 'beginning' we postulate was just an event in a never ending universe.

In short, who cares?


Mathematical physicists build their careers on speculation and ever more complicated models such as the big bang and the myriad of string/brane theories. K.I.S.S. Nature likes simplicity, i.e. a static universe.
frajo
1 / 5 (3) May 04, 2009
K.I.S.S. Nature likes simplicity, i.e. a static universe.


As simple as thunder and lightning, the powers of nature? As simple as life and the human brain?
Alizee
May 04, 2009
This comment has been removed by a moderator.
Alexa
May 07, 2009
This comment has been removed by a moderator.