Physicists find way to 'see' extra dimensionsFebruary 05, 2007
A new study demonstrates that the shapes of extra dimensions can be "seen" by deciphering their influence on cosmic energy released by the violent birth of the universe 13 billion years ago. The method, published today (Feb. 2) in Physical Review Letters, provides evidence that physicists can use experimental data to discern the nature of these elusive dimensions-the existence of which is a critical but as yet unproven element of string theory, the leading contender for a unified "theory of everything."
Scientists developed string theory, which proposes that everything in the universe is made of tiny, vibrating strings of energy, to encompass the physical principles of all objects from immense galaxies to subatomic particles. Though currently the front-runner to explain the framework of the cosmos, the theory remains, to date, untested.
The mathematics of string theory suggests that the world we know is not complete. In addition to our four familiar dimensions-three-dimensional space and time-string theory predicts the existence of six extra spatial dimensions, "hidden" dimensions curled in tiny geometric shapes at every single point in our universe.
Don't worry if you can't picture a 10-dimensional world. Our minds are accustomed to only three spatial dimensions and lack a frame of reference for the other six, says UW-Madison physicist Gary Shiu, who led the new study. Though scientists use computers to visualize what these six-dimensional geometries could look like (see image), no one really knows for sure what shape they take.
The new Wisconsin work may provide a long-sought foundation for measuring this previously immeasurable aspect of string theory.
According to string theory mathematics, the extra dimensions could adopt any of tens of thousands of possible shapes, each shape theoretically corresponding to its own universe with its own set of physical laws.
For our universe, "Nature picked one-and we want to know what that one looks like," explains Henry Tye, a physicist at Cornell University who was not involved in the new research.
Shiu says the many-dimensional shapes are far too small to see or measure through any usual means of observation, which makes testing this crucial aspect of string theory very difficult. "You can theorize anything, but you have to be able to show it with experiments," he says. "Now the problem is, how do we test it?"
He and graduate student Bret Underwood turned to the sky for inspiration.
Their approach is based on the idea that the six tiny dimensions had their strongest influence on the universe when it itself was a tiny speck of highly compressed matter and energy-that is, in the instant just after the big bang.
"Our idea was to go back in time and see what happened back then," says Shiu. "Of course, we couldn't really go back in time."
Lacking the requisite time machine, they used the next-best thing: a map of cosmic energy released from the big bang. The energy, captured by satellites such as NASA's Wilkinson Microwave Anisotropy Probe (WMAP), has persisted virtually unchanged for the last 13 billion years, making the energy map basically "a snapshot of the baby universe," Shiu says. The WMAP experiment is the successor to NASA's Cosmic Background Explorer (COBE) project, which garnered the 2006 Nobel Prize in physics.
Just as a shadow can give an idea of the shape of an object, the pattern of cosmic energy in the sky can give an indication of the shape of the other six dimensions present, Shiu explains.
To learn how to read telltale signs of the six-dimensional geometry from the cosmic map, they worked backward. Starting with two different types of mathematically simple geometries, called warped throats, they calculated the predicted energy map that would be seen in the universe described by each shape. When they compared the two maps, they found small but significant differences between them.
Their results show that specific patterns of cosmic energy can hold clues to the geometry of the six-dimensional shape-the first type of observable data to demonstrate such promise, says Tye.
Though the current data are not precise enough to compare their findings to our universe, upcoming experiments such as the European Space Agency's Planck satellite should have the sensitivity to detect subtle variations between different geometries, Shiu says.
"Our results with simple, well-understood shapes give proof of concept that the geometry of hidden dimensions can be deciphered from the pattern of cosmic energy," he says. "This provides a rare opportunity in which string theory can be tested."
Technological improvements to capture more detailed cosmic maps should help narrow down the possibilities and may allow scientists to crack the code of the cosmic energy map-and inch closer to identifying the single geometry that fits our universe.
The implications of such a possibility are profound, says Tye. "If this shape can be measured, it would also tell us that string theory is correct."
University of Wisconsin-Madison
Related Dimension Current Events and Dimension News Articles
The path to artificial photosynthesis
Through their work, Professor Emad Aziz, head of the HZB Institute "Methods for Material Development", Professor Leone Spiccia from Monash University and their teams have taken an important leap forward in understanding photosynthesis - the method green plants use to obtain energy - in artificial systems.
Inside the big wormhole
If we combine the map of the dark matter in the Milky Way with the most recent Big Bang model to explain the universe and we hypothesise the existence of space-time tunnels, what we get is that our galaxy could really contain one of these tunnels, and that the tunnel could even be the size of the galaxy itself.
Helicopter parenting better for pets than for kids
Helicopter parenting may not be the best strategy for raising independent kids. But a healthy measure of clinginess and overprotectiveness could actually be advantageous when rearing dogs and cats, according to new research from UC Berkeley and California State University, East Bay.
Nature, nurture and time
Nature and nurture have found a new companion -- historical context.
Study sheds new light on relationship between personality and health
Researchers have found new evidence that explains how some aspects of our personality may affect our health and wellbeing, supporting long-observed associations between aspects of human character, physical health and longevity.
It Doesn't Add Up: People Who Say They Are Good at Math, But Aren't
Thinking you're good at math and actually being good at it are not the same thing, new research has found.
New research paves the way for nano-movies of biomolecules
An international team, including scientists from Arizona State University, the University of Milwaukee-Madison (UMW), and Germany's Deutsches Elektronen-Synchrotron (DESY), have caught a light sensitive biomolecule at work using an X-ray laser.
Study details laser pulse effects on behavior of electrons
By solving a six-dimensional equation that had previously stymied researchers, University of Nebraska-Lincoln physicists have pinpointed the characteristics of a laser pulse that yields electron behavior they can predict and essentially control.
Obesity-attributable absenteeism among US workers costs the nation more than $8 billion annually
A study conducted by researchers at Columbia University's Mailman School of Public Health shows that obesity costs the U.S. $8.65 billion per year as a result of absenteeism in the workplace --more than 9% of all absenteeism costs.
Notre Dame network physicists create model to predict traffic patterns
Researchers at the University of Notre Dame have designed a simple, yet highly accurate traffic prediction model for roadway transportation networks. They have recently published their work in the journal Nature Communications.
More Dimension Current Events and Dimension News Articles