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Topic: Supersymmetry

In the News (Sun 18 Aug 19)

 Supersymmetry - Wikipedia, the free encyclopedia Supersymmetry was orginally developed in the 1970s by the research group of Jonathan I. Segal at MIT; at the same time Daniel Laufferty at Tufts University proposed a similar idea. To incorporate supersymmetry into particle physics, the Standard Model must be extended to include at least twice as many particles, since there is no way that any of the particles in the Standard Model can be superpartners of each other (they have incompatible masses and quantum numbers). Supersymmetries, on the other hand, are generated by objects that transform under the spinor representations. en.wikipedia.org /wiki/Supersymmetry   (1808 words)

 Supersymmetry Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: 2007-10-20) Supersymmetry is a theory of particle physics that extends the Standard Model by associating each boson with a corresponding fermion and vice-versa. Supersymmetry suggests that every fundamental fermion has a "superpartner" which is a boson, and similarly every fundamental boson has a superpartner which is a fermion. Supersymmetry could be discovered at the Large Hadron Collider (LHC) at CERN which is due to open in 2007. www.wikiwhat.com /encyclopedia/s/su/supersymmetry.html   (481 words)

 Open Questions: Supersymmetry Supersymmetry, for instance, can be added to other particle theory models, such as the standard model and grand unified theories. Under certain conditions, it is possible to calculate using supersymmetry that B at some point becomes negative as the energy scale decreases (or equivalently, as the length scale increases). Because supersymmetry predicts the existence of superpartners of all the known fermions and bosons, and because all of these superpartners must be quite massive, the theory provides an abundance of candidates for the cold dark matter which is rather definitely known to be necessary to make up the bulk of the mass of the universe. www.openquestions.com /oq-ph007.htm   (9203 words)

 2. Supersymmetry Supersymmetry postulates that for every Standard Model particle there is a corresponding supersymmetric particle (or ``sparticle'') which has a spin that is different by 1/2 unit. We know that supersymmetry cannot be an exact symmetry--if it were, there would be particles with exactly the properties of the electrons (including mass) as the electron, except for the spin. If supersymmetry is broken, then the sparticles may have much greater masses than ordinary particles (though they must have masses less than about 1 TeV in order for the cancellation of Figure 3 to work). hep-www.colorado.edu /~nlc/SUSY_Wagner/susy/node2.html   (817 words)

 Supersymmetry Reconsidered And, supersymmetry figures into an alternative approach to string theory, in which supersymmetric partners are postulated to constitute a substructure to the known particles of the standard model. Finally, supersymmetry is the only principle that allows theorists to quantize the gravitational field, and thus unify gravity with the other three forces. Clearly, supersymmetry is a vital ingredient of the most promising theoretical programs to advance the standard model beyond its present plateau, irrespective of which approach ultimately proves correct. starflight1.freeyellow.com /page6.html   (4057 words)

 Supersymmetry The breakdown of Supersymmetry must be manifest in a split of masses between ordinary particles and their super-partners. Under Supersymmetry, every elementary particle is a doublet including a fermion and a boson; the fermionic and bosonic degrees of freedom in the theory must be equal in number. Supersymmetry is a plausible candidate and, in fact, most (but not all) Grand Unification Theories are based on Susy. info.fuw.edu.pl /~michals/susy.html   (2582 words)

 Supersymmetry breaking: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-20) The gravitino is the hypothetical supersymmetric partner of the graviton, as predicted by theories combining general relativity and supersymmetry, i.e.... In supersymmetry, it is proposed that every fermion should have a "partner" boson, known as its superpartner.... In theoretical physics, soft susy breaking is a supersymmetry breaking by the special kind of terms that do not invalidate certain desirable features of supersymmetry,... www.absoluteastronomy.com /encyclopedia/s/su/supersymmetry_breaking.htm   (532 words)

 Amazon.ca: Supersymmetry: Unveiling the Ultimate Laws of Nature: Books   (Site not responding. Last check: 2007-10-20) The physical theory called "supersymmetry" is as yet unproven, but its proof will unite the four fundamental forces of nature--electromagnetism, gravity, and the strong and weak nuclear forces--and lead to the so-called Grand Unified Theory that physicists have long quested after. Supersymmetry is a particular mathematical extension of the standard model in which the equations predict additional things like superpartners. For example, Kane points out that the superpartners predicted by supersymmetry could help to explain the missing mass of the universe (mass that is known to exist from the gravitational maps produced by the measuring the motions of stars, but not visibly detected). www.amazon.ca /exec/obidos/ASIN/0738204897   (1792 words)

 Not Even Wrong » Blog Archive » Attack on the Main Argument for Supersymmetry The first of these goes something like “supersymmetry unifies bosons and fermions, isn’t that great?” This argument doesn’t really make a whole lot of sense since none of the observed bosons or fermions can be related to each other by supersymmetry (basically because there are no observed boson-fermion pairs with the same internal quantum numbers). Supersymmetry and the consequent superstrings were indeed powerful and promising mathematical ideas and were worth pursuing, but are wearing a bit thin now after 20 years. In principle one can hope that some compelling model for supersymmetry breaking exists that predicts the 100 or so parameters, but the fact of the matter is that all pheonomenologically viable methods of supersymmetry breaking are complicated, contrived, and don’t do much in the way of fixing those parameters. www.math.columbia.edu /~woit/wordpress/archives/000025.html   (6919 words)

 Angel: Supersymmetry - TV.com Elizabeth and Sarah wrote "Supersymmetry" with the intention of having Fred kill Professor Seidel. Supersymmetry is one of the foundations of string theory, which Fred refers to in her research. Fred is finally able to show her dark side but instead of her killing the man who send her to pylea it's Gunn who does that for her but instead of being gratefull it tears them appart. www.tv.com /angel/supersymmetry/episode/192069/summary.html   (745 words)

 Amazon.de:  Supersymmetry: Unveiling the Ultimate Laws of Nature: English Books   (Site not responding. Last check: 2007-10-20) The theory underlying supersymmetry posits that every particle has a "superpartner" (a quark has a "squark," an electron a "selectron," and so on), whose existence can be... It focuses intently on the research and development of supersymmetry, which is interesting, but at times this degrades from the scientific flow of the book. Supersymmetry is a very complicated idea, and it is still fairly unclear to me; a more thourough read, though, would clarify it completely. www.amazon.de /exec/obidos/ASIN/0738204897   (1774 words)

 Phenomenology Research Pursuits: Supersymmetry The existence of a supersymmetry, with equal numbers of boson and fermion states connected by the symmetry, would naturally explain the spontaneous symmetry breaking and solve the fine-tuning problem through additional loops that cancel quadratic divergences. The experimental signatures of sparticles depend on the way that the supersymmetry breaking is communicated from the hidden sector of the theory to the physical sector, with gravity-mediated models and gauge-mediated models leading to different decay patterns of the sparticles and consequently to very different signals. We are making extensive phenomenological studies of the collider signals of supersymmetry and their Standard Model backgrounds that are important to define the criteria of experimental searches. www.pheno.info /about/supersymmetry   (240 words)

 Alibris: Supersymmetry A fascinating, readable account of the new theory of physics that the four fundamental forces governing the universe are actually different manifestations of a single unifying force, a daring theory thought to be the missing link in Einstein's unsolved unified field theory. In physical terms, supersymmetry is a symmetry or gauge invariance which connects bosons (particles with integer spin) with fermions (particles with... Supersymmetry: Basics and Concepts provides an overall survey of supersymmetry from a unified and up-to-date viewpoint. www.alibris.com /search/books/subject/Supersymmetry   (931 words)

 String People: Jim Gates When I was a graduate student looking around for a topic on which to do my Ph.D. thesis, I started by working on a problem in what’s called weak interaction physics, and I had an advisor who taught me some various mathematical techniques and techniques of analysis and what have you. And as I read this material, it was an introduction to the notion of superspace and supersymmetry, and I immediately recognized that: a. But by the time I had graduated I had essentially gotten to the forefront of the field, being that it was such a young and new area, and so I was able to actually make contributions in the field that had never actually occurred before. superstringtheory.com /people/jgates.html   (2092 words)

 PERSPECTIVES ON SUPERSYMMETRY Supersymmetry is at an exciting stage of development. While there are a number of reviews and books where the mathematical structure and uses of supersymmetry can be learned, there are few where the particle physics is the main focus. It begins with an excellent pedagogical introduction to the physics and methods and formalism of supersymmetry, by S Martin, which is accessible to anyone with a basic knowledge of the Standard Model of particle physics. www.worldscibooks.com /physics/3865.html   (416 words)

 Introduction to Supersymmetry Supersymmetry is an idea that history repeats itself to solve similar problems. Supersymmetry actually makes the unification of three other forces, strong, weak, and electromagnetic, also a reality. In (a), in the Standard Model without supersymmetry, the strengths of three forces change as a function of energies, and become closer to each other at very high energies. hitoshi.berkeley.edu /public_html/susy/susy.html   (1040 words)

 Science Grid This Week One of the discoveries eagerly anticipated by particle physicists working on the world's next particle collider is that of supersymmetry, a theoretical lost symmetry of nature. Supersymmetry, often called SUSY, predicts the existence of a superpartner particle for every known particle. Recent experiments have suggested that most of the matter in our universe is not made of familiar atoms, but of some new sort of "dark matter." Discovering a hidden world of sparticles will shed light on the nature of this dark matter, connecting observations performed at earth-based accelerators with those performed by astrophysicists and cosmologists. www.interactions.org /sgtw/2006/0308/susy_more.html   (441 words)

 CERN Courier - Supersymmetry physics on (an - IOP Publishing - article Supersymmetry (SUSY) is the leading contender for physics beyond the SM. Although SUSY has been around for some time and has so far had no direct experimental support, indirect experimental hints and progress in understanding the theoretical possibilities allowed for in a SUSY world have led to a new feeling of excitement. Supersymmetry might not manifest itself as neutrino-like invisible events detectable only through "missing" energy, but in several other ways, for example in events producing additional photons or stable charged particles, or models with supersymmetric particles that are nearly degenerate in mass. www.cerncourier.com /main/article/40/10/19/1   (1540 words)

 [No title]   (Site not responding. Last check: 2007-10-20) Now you see how simple it is. It has always been in plain view, as a car has more mass when in motion than when at rest. Supersymmetry unites bosons and fermions into a single theory. Gravitons cannot be seen; they are responsible for kinetic energy being equal to 1/2 the mass times the velocity squared. supersymmetry.com   (2288 words)

 Modern Supersymmetry by John Terning This graduate level textbook begins with a brief review of supersymmetry, and the construction of the minimal supersymmetric standard model and approaches to supersymmetry breaking. Seiberg duality is discussed in detail, with many example applications provided, with special attention paid to its use in understanding dynamical supersymmetry breaking. This book is unique in containing an overview of the important developments in supersymmetry since the publication of "Supersymmetry and Supergravity" by Wess and Bagger. particle.physics.ucdavis.edu /modernsusy   (219 words)

 Supersymmetry   (Site not responding. Last check: 2007-10-20) Supersymmetry is a theoretically attractive possibility for several reasons. Most important from my viewpoint, is the fact that it is required by superstring theory. Whereas ordinary space and time dimensions are described by ordinary numbers, which have the property that they commute: X·Y = Y·X, the supersymmetry directions are described by numbers that anti-commute: X·Y = -Y·X. www.theory.caltech.edu /people/jhs/strings/string12.html   (105 words)

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