Point particle: Difference between revisions
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a point particle is a mathematical abstraction,evrything in the real world has structure,it needs structure to interact with other particles,if it was trully a point it would not be capable of interating with any other particle,and the universe as it is wouldnt exist,this view of elementary particles as bieng zero dimentional "points" leads to quantum physics bieng plauged with infinities,to get rid of this embarasing number of infinities(wich would show the nature of the abstraction,infinity+infinity=infinity)they remove the infinities from thier equations,in other words fudging,the "scientists" call it "renormalization",like for example electrons,in the discovery that the solar system model of the atom was wrong,and in the new electron cloud model,the so called "scientists" asume that when they arnt observing it it the electron is present in sevral different places at once!it suposedly dissolves into "probability waves" and convieniently turns back into a particle when its next measured!this kind of arbitrary mathematical fantasy is what is nowadays passed of as "science" |
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{{Unreferenced|date=September 2008}} |
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A '''point particle''' (or '''point-like particle''', often spelled '''pointlike particle''') is an idealized object heavily used in [[physics]]. Its defining feature is that it lacks [[dimension|spatial]] [[extension]]: being zero-dimensional, it does not take up space. A point particle is an appropriate representation of any object whose size, shape, and structure is irrelevant in a given context. For example, from far enough away, an object of any shape will look and behave as a point-like object. Particular "types" of point particles include [[point mass]]es and [[point charge]]s, point particles whose only attributes are their [[mass]] and [[charge]] respectively. |
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Sometimes due to specific combinations of properties extended objects behave as point-like even in their immediate vicinity. For example, spherical objects interacting in 3-dimensional space whose interactions are described by the [[inverse square law]] behave in such a way as if all their matter were concentrated in their geometric centers. In [[Law of universal gravitation|Newtonian gravitation]] and classical [[electromagnetism]], for example, the respective [[Field (physics)|fields]] outside of a spherical object are identical to those of a point particle of equal charge/mass located at the center of the sphere. |
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In [[particle physics]], "point particle" is synonymous with "[[elementary particle]]", which is defined as a particle without structure or, equivalently, as a particle which is not made up from component parts. According to the [[Standard Model]] of fundamental particles and forces, [[quark]]s, [[lepton]]s and the (non-composite) [[vector boson]]s are point particles in this sense. There is no experimental evidence for any of the elementary particles having spatial extent, and so they are usually considered to be point particles in the more general sense too (at least to the limited extent that the concept of a "particle" is meaningful in [[quantum field theory]]). |
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[[Category:Introductory physics]] |
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[[Category:Fundamental physics concepts]] |
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[[ca:Partícula puntual]] |
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[[cs:Bodová částice]] |
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[[el:Υλικό σημείο]] |
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[[fr:Mécanique du point]] |
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[[it:Punto materiale]] |
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[[pt:Ponto material]] |
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Revision as of 00:08, 5 March 2009
a point particle is a mathematical abstraction,evrything in the real world has structure,it needs structure to interact with other particles,if it was trully a point it would not be capable of interating with any other particle,and the universe as it is wouldnt exist,this view of elementary particles as bieng zero dimentional "points" leads to quantum physics bieng plauged with infinities,to get rid of this embarasing number of infinities(wich would show the nature of the abstraction,infinity+infinity=infinity)they remove the infinities from thier equations,in other words fudging,the "scientists" call it "renormalization",like for example electrons,in the discovery that the solar system model of the atom was wrong,and in the new electron cloud model,the so called "scientists" asume that when they arnt observing it it the electron is present in sevral different places at once!it suposedly dissolves into "probability waves" and convieniently turns back into a particle when its next measured!this kind of arbitrary mathematical fantasy is what is nowadays passed of as "science"