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    The Waning Search For Primordial Antimatter
    By News Staff | October 30th 2008 12:00 AM | 1 comment | Print | E-mail | Track Comments
    Scientists have long been on the hunt for evidence of antimatter, matter's arch nemesis and a staple of science fiction in the last century, that might be left over from the very early Universe.  But the latest  results using data from NASA's Chandra X-ray Observatory and Compton Gamma Ray Observatory suggest the search is not going to get any easier.

    Antimatter would be made up of elementary particles, each of which has the same mass as their corresponding matter counterparts --protons, neutrons and electrons -- but the opposite charges and magnetic properties. When matter and antimatter particles collide, theory says they annihilate each other and produce energy according to Einstein's famous equation, E=mc2.

    According to the Big Bang model, the Universe was awash in particles of both matter and antimatter shortly after the Big Bang. Most of this material annihilated, but because there was slightly more matter than antimatter - less than one part per billion - only matter was left behind, at least in the local Universe.


    Antimatter is made up of elementary particles that have the same masses as their corresponding matter counterparts but the opposite charges and magnetic properties. This illustration shows what happens when a particle of antimatter collides with one of matter. The particles annihilate each other and produce energy according to Einstein's famous equation, E=mc2, mostly in the form of gamma rays, which scientists are looking for using the Compton observatory. Secondary particles are also produced. This annihilation has not been seen in the Bullet Cluster.  Photo Credit: CXC/M. Weiss

    Trace amounts of antimatter are believed to be produced by powerful phenomena such as relativistic jets powered by black holes and pulsars, but no evidence has yet been found for antimatter remaining from the infant Universe.

    How could any primordial antimatter have survived? Just after the Big Bang there was believed to be an extraordinary period, called inflation, when the Universe expanded exponentially in just a fraction of a second.

    "If clumps of matter and antimatter existed next to each other before inflation, they may now be separated by more than the scale of the observable Universe, so we would never see them meet," said Gary Steigman of The Ohio State University, who conducted the study. "But, they might be separated on smaller scales, such as those of superclusters or clusters, which is a much more interesting possibility."

    In that case, collisions between two galaxy clusters, the largest gravitationally-bound structures in the Universe, might show evidence for antimatter. X-ray emission shows how much hot gas is involved in such a collision. If some of the gas from either cluster has particles of antimatter, then there will be annihilation and the X-rays will be accompanied by gamma rays.


    This view of the Bullet Cluster is a combination of X-rays from Chandra (red) and optical data from the Hubble and Magellan telescopes (yellow). Scientists have examined this system with Chandra and Compton to look for evidence of antimatter that may be found in X-ray and gamma ray emission. The results did not reveal the signature for antimatter, meaning that if it is there, antimatter is less than 3 parts per million in this system.  Photo Credit: X-ray: NASA/CXC/CfA/M.Markevitch et al. Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.

    Steigman used data obtained by Chandra and Compton to study the so-called Bullet Cluster, where two large clusters of galaxies have crashed into one another at extremely high velocities. At a relatively close distance and with a favorable side-on orientation as viewed from Earth, the Bullet Cluster provides an excellent test site to search for the signal for antimatter.

    "This is the largest scale over which this test for antimatter has ever been done," said Steigman, whose paper was published in the Journal of Cosmology and Astroparticle Physics. "I'm looking to see if there could be any clusters of galaxies which are made of large amounts of antimatter."

    The observed amount of X-rays from Chandra and the non-detection of gamma rays from the Compton data show that the antimatter fraction in the Bullet Cluster is less than three parts per million. Moreover, simulations of the Bullet Cluster merger show that these results rule out any significant amounts of antimatter over scales of about 65 million light years, an estimate of the original separation of the two colliding clusters.

    "The collision of matter and antimatter is the most efficient process for generating energy in the Universe, but it just may not happen on very large scales," said Steigman. "But, I'm not giving up yet as I'm planning to look at other colliding galaxy clusters that have recently been discovered."

    Finding antimatter in the Universe might tell scientists about how long the period of inflation lasted. "Success in this experiment, although a long shot, would teach us a lot about the earliest stages of the Universe," said Steigman.

    Tighter constraints have been placed by Steigman on the presence of antimatter on smaller scales by looking at single galaxy clusters that do not involve such large, recent collisions.

    Comments

    I believe that to find anti-matter or dark matter, actually the two may be the same, you have to view the world and the universe some what differently. I firmly believe that the entire universe is a living organism. We look out at the stars from a different dimension than someone looking in at the same stars. We use a telescope and the other uses a microscope. Ther is no voids in a living organism. There may-be areas of different matter, like air in the lungs or a viscus fluid in the crainium but all in all its matter just the same. Oh I know you realize that I am speaking of the old ather or ether or the stuff you can't see that binds the universe in its motion. Space, a dark deep cold empty vacuum or can it just be the life blood of all we see glowing ou there.
    The sun's coronal temperature is still a few million degrees above the sun's surface temperature and the big brains call that a phenomenon. Could there possibly be some form of energy which is being fed constantly inwards toward the sun just like a biological cell feeds off of the surrounding fluid.
    The earth feeds constantly off of a mysterious form of dark energy from the heaveans which we call lightning. There are many lightning strikes on the earth every second. Energy from without not from within.
    Lightning and different forms of lightning take on very strange shapes, structures and very different total energies than science can explain. Some of these strange forms of lightning like sprites and blue jets don't even get an
    explanation atleast as of yet. And yet these mysterious forms of energy appear in the ather which starts about eyeball level in relation to the earth.
    Ather, ether dark-matter, antimatteror what-ever,semantics or playing with unseeable forces and energy that we do not understand as of yet. There is a very little known lightning phenomena which NASA is hidding information about called Kite Lightning. That is a term that you can not Google and get any information on. Nasa's secret that totally changes our perspective on dark matter. The 70 % of the lightning that takes place in a thunder clound takes place because of dark energy being converted into a beautiful red sprite which is shot upwards by the energy conversion.
    Soon I will write an article about this to see what you think about my theory.