. 24/7 Space News .
NU Researchers Find Signs Of Extra Dimensions

by Staff Writers
Boston MA (SPX) Jan 27, 2006
Researchers at Northeastern University and the University of California, Irvine say that scientists might soon have evidence for extra dimensions and other exotic predictions of string theory.

Early results from a neutrino detector at the South Pole, called AMANDA, show that ghostlike particles from space could serve as probes to a world beyond our familiar three dimensions, the research team says.

No more than a dozen high-energy neutrinos have been detected so far. However, the current detection rate and energy range indicate that AMANDA's larger successor, called IceCube, now under construction, could provide the first evidence for string theory and other theories that attempt to build upon our current understanding of the universe.

An article describing this work appears in the current issue of Physical Review Letters. The authors are: Luis Anchordoqui, associate research scientist in the Physics Department at Northeastern University; Haim Goldberg, professor in the Physics Department at Northeastern University; and Jonathan Feng, associate professor in the Department of Physics and Astronomy at University of California, Irvine. The evidence, they say, would come from how neutrinos interact with other forms of matter on Earth.

"To find clues to support string theory and other bold, new theories, we need to study how matter interacts at extreme energies," said Anchordoqui. "Human-made particle accelerators on Earth cannot yet generate these energies, but nature can in the form of the highest-energy neutrinos."

In recent decades, new theories have developed - such as string theory, extra dimensions and supersymmetry - to bridge the gap between the two most successful theories of the 20th century, general relativity and quantum mechanics. Quantum mechanics describes three of the fundamental forces of nature: electromagnetism, strong forces (binding atomic nuclei) and weak forces (seen in radioactivity). It is, however, incompatible with Einstein's general relativity, the leading description of the fourth force, gravity. Scientists hope to find one unified theory to provide a quantum description of all four forces.

Clues to unification, scientists say, lie at extreme energies. On Earth, human-made particle accelerators have already produced energies at which electromagnetic forces and weak forces are indistinguishable. Scientists have ideas about how the next generation of accelerators will reveal that strong forces are indistinguishable from the weak and electromagnetic at yet higher energies. Yet to probe deeper to see gravity's connection to the other three forces, still higher energies are needed.

Anchordoqui and his colleagues say that extragalactic sources can serve as the ultimate cosmic accelerator, and that neutrinos from these sources smacking into protons can release energies in the realm where the first clues to string theory could be revealed.

Neutrinos are elementary particles similar to electrons, but they are far less massive, have neutral charge, and hardly interact with matter. They are among the most abundant particles in the universe; untold billions pass through our bodies every second. Most of the neutrinos reaching Earth are lower-energy particles from the sun.

AMANDA, funded by the National Science Foundation, attempts to detect neutrinos raining down from above but also coming "up" through the Earth. Neutrinos are so weakly interacting that some can pass through the entire Earth unscathed. The total number of "down" and "up" neutrinos is uncertain; however, barring exotic effects, the relative detection rates are well known.

AMANDA detectors are positioned deep in the Antarctic ice. The NSF-funded IceCube has a similar design, only it has about six times more detectors covering a volume of one cubic kilometer. A neutrino smashing into atoms in the ice will emit a brief, telltale blue light; and using the detectors, scientists can determine the direction where the neutrino came from and its energy.

The key to the work presented here is that the scientists are comparing "down" to "up" detections and looking for discrepancies in the detection rate, evidence of an exotic effect predicted by new theories.

"String theory and other possibilities can distort the relative numbers of 'down' and 'up' neutrinos," said Jonathan Feng. "For example, extra dimensions may cause neutrinos to create microscopic black holes, which instantly evaporate and create spectacular showers of particles in the Earth's atmosphere and in the Antarctic ice cap. This increases the number of 'down' neutrinos detected. At the same time, the creation of black holes causes 'up' neutrinos to be caught in the Earth's crust, reducing the number of 'up' neutrinos. The relative 'up' and 'down' rates provide evidence for distortions in neutrino properties that are predicted by new theories."

"The neutrinos accelerated in the cosmos to energies unattainable on Earth can detect the 'footprint' of new physics," said Goldberg. "The 'body' responsible for the footprint can then emerge through complementary experiments at the new generation of human-made colliders. On all fronts, it is an exciting era in high-energy physics."

Related Links
Northeastern University
University of California, Irvine
IceCube website



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


Unified Physics Theory Explains Animals Running Flying And Swimming
Durham NC (SPX) Jan 05, 2006
A single unifying physics theory can essentially describe how animals of every ilk, from flying insects to fish, get around, researchers at Duke University's Pratt School of Engineering and Pennsylvania State University have found. The team reports that all animals bear the same stamp of physics in their design.







  • SuitSat To Be Thrown Overboard February 3
  • Cooking Dinner At Home From The Office
  • Russia's Kliper Shuttle To Be Launched In 2015
  • NASA Looking To Break New Ground With Crew And Cargo Transport Request

  • Spirit Completes Studies Of Arad, Moves On
  • Celebrating Two Years Of Mars Express Discoveries
  • "THOR" Mars Mission To Seek Underground Water
  • Twin Rovers Advance Understanding Of Mars

  • Kazakh Telecom Satellite To Be Launched In June
  • Arabsat 4A Delivered To Baikonur
  • Japan H2 Heavy Lofts Disaster Monitoring Satellite
  • Eutelsat's Hot Bird 7A Arrives At Kourou From Alcatel Alenia Space Facilities

  • Japan's ALOS In Orbit: ESA Will Deliver Its Data To European Researchers
  • NASA Magnetic Field Mission Ends
  • Winter Snow On The Hindu Kush
  • TIGER Innovators Enhance North-South Collaboration

  • On The Road To Pluto At Last
  • The PI's Perspective 24 Hours After Launch: It Worked!
  • LockMart Thermoelectric Generator Powers NASA Pluto New Horizons Probe
  • Spacecraft Bound For Pluto Supported By Aerojet Propulsion

  • Two Exiled Stars Are Leaving Our Galaxy Forever
  • Dissecting Stardust
  • Cartwheel Galaxy Makes Waves In New NASA Image
  • Astronomers Detect Largest Cluster Of Red Supergiants

  • Russia Plans Mine On The Moon By 2020
  • Jack Skis The Moon
  • Engineer Who Has Name On Moon Dies
  • Apollo Chronicles

  • Putin And Ivanov Discuss Future Of GLONASS System
  • EADS Space To Play Central Role In Galileo Sat Nav Test
  • ESA, Galileo Industries Seal Deal For First 4 Galileo Sats
  • GLONASS To Have 18 Satellites In Orbit In 2008

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement