What's The Matter With Antimatter?
Can you imagine antiworlds and antipeople out there?
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November 6, 2009 at 11:46 AM
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| Modern science has shown that matter and the material world is just one side of a coin. If our world is made of normal matter, it is equally logical to think of a world composed of antimatter. Matter and energy are manifestation of the same underlying entity. In particle physics, every particle has a corresponding antiparticle. Particles — like electrons, protons and neutrons — make up ordinary matter, while their antiparticles — such as positrons (anti electrons), antiprotons and antineutrons — make up antimatter. Sequential logic allows us to imagine the existence of anti-entities, such as antiplanets or antihumans. However, the existence of antimatter is ruled out at least in this universe, because matter won over antimatter in the battle of existence that occurred 13.7 billion years ago in the Big Bang. The after-effect of that battle is the Cosmic Microwave Background (CBM) radiation, which is the first energy (light) formed in the universe as a result of the mutual annihilation of matter and antimatter.
This physical reality has expressions in mythology, religion and folklore as the epic battle between good and evil. In Hindu literature, the Devas govern the regions of heaven and are opposed by the demonic Asuras. In the cosmic struggle between the forces of order and chaos, Devas support humans who inhabit the earth. The conflict between Devas and Asuras is described in the myth of the churning of the “ocean of milk” (Palazhi) for treasures, including Amritha, which provides strength (energy) and immortality. This battle between matter and antimatter is an ongoing event, although science has not yet confirmed the subsistence of such conflicts beyond the early universe. Standard cosmological theory suggests that the universe began with equal amounts of matter and antimatter, like the twins of Big Bang. However, in the early universe this super symmetry was broken for unknown reasons, leading to the dominance of matter in this universe. It is one of the unsolved mysteries in science, known as the Baryon asymmetry problem in physics. Assuming that there were equal amounts of matter and antimatter in the early universe, their mutual destruction would have caused the complete absence of any matter. The whole universe would have been filled with energy (light) created in that process.
The Rig Veda, the ancient Hindu text, dwells on fundamental particles and forces of nature as it describes the creation of the universe from the remains of a gigantic primeval Cosmic Man. Creation happened gradually; the universe in its primitive form primarily spread homogeneously throughout the universe. The complete equilibrium and homogeneity, when broken, arose an inhomogeneous state of the primordial fluid. “Which of these two came earlier, which came later? How did they come to birth? Who, O Seers, can discern it? They contain within them all that has a name, while days and nights revolve as on a wheel.”
The matter-antimatter annihilation produces pure energy even more efficiently than nuclear fission or fusion. According to Einstein’s equation, E=mc2, the mutual annihilation of 1 kg each of matter and antimatter could produce energy equivalent to that of the most powerful nuclear bomb ever tested, which in turn uses hundreds of kilograms of nuclear material. This remarkable energy formation from nearly negligible amounts of matter is appealing to scientists and fiction writers alike, such in the 2009 movie Angels & Demons based on Dan Brown’s novel by the same name. “The fact that Angels & Demons is a best-selling novel and now a Hollywood movie gives us the opportunity to show how exciting the reality of antimatter research is,” says CERN Research Director Sergio Bertolucci. Even though the existence of antimatter is well established, the biggest particle accelerators in the world have been able to create only a handful of anti particles. CERN and the U.S. government’s Fermi National Accelerator Laboratory (Fermilab), located in Batavia near Chicago, Illinois, have produced anti particles, including antihydrogen atoms, but not in any measurable quantities. The first antihydrogen atom was created at CERN in 1995. As of now, antimatter particles are considered to be the most expensive particles to produce, at an estimated cost of $62.5 trillion a gram. Given the cost of production and lack of storing techniques, these particles remain illusive, at least in the near future. But scientists are hopeful that in the coming years they will find ways to generate antimatter in larger quantities and develop advanced techniques to store this mysterious matter.
Hydrogen atoms, being the most simple in structure (one proton and one electron), its antimatter antihydrogen (one anti proton and a positron) is the easiest antimatter to synthesize. The ATHENA (AnTiHydrogEN Apparatus) at CERN was an international collaboration to produce antihydrogen atoms at low temperature for experimental purposes. ATHENA has produced tens of thousands of anti hydrogen atoms. However, it was practically impossible to capture the antihydrogen atoms because of the high temperatures associated with them. The high energy antihydrogen atoms hit the wall of the experimental apparatus and annihilated with atoms of normal matter. The analysis of antihydrogen atoms would reveal the difference between matter and antimatter beyond theoretical assumptions and possibly validate the theories of the absence of antimatter in our universe. Though the ATHENA experiment came to an end in 2004, another ATRAP (Anti Hydrogen Trap) collaboration is still in operation. Its goal is to create antihydrogen at a lower temperature that can be trapped long enough to compare with ordinary hydrogen.
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