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| {{Unreferenced|date=November 2006}}
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| In mathematical physics, '''inversion transformations''' are a natural extension of [[Poincaré transformation]]s to include all [[conformal map|conformal]] [[bijection|one-to-one]] transformations on coordinate [[space-time]]. They are less studied in physics because unlike the rotations and translations of Poincaré symmetry an object cannot be physically transformed by the inversion symmetry. Some physical theories are invariant under this symmetry, in these cases it is what is known as a 'hidden symmetry'. Other hidden symmetries of physics include [[gauge symmetry]] and [[general covariance]].
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| ==Early use==
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| In 1831 the mathematician [[Ludwig Immanuel Magnus]] began to publish on transformations of the plane generated by inversion in a circle of radius ''R''. His work initiated a large body of publications, now called [[inversive geometry]]. The most prominently named mathematician became [[August Ferdinand Möbius]] once he reduced the planar transformations to [[complex number]] arithmetic. In the company of physicists employing the inversion transformation early on was [[Lord Kelvin]], and the association with him leads it to be called the [[Kelvin transform]].
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| ==Transformation on coordinates==
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| In the following we shall use imaginary time (<math>t'=it</math>) so that space-time is Euclidean and the equations are simpler. The Poincaré transformations are given by the coordinate transformation on space-time parametrized by the 4-vectors ''V''
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| :<math>V_\mu ^\prime = O_\mu ^\nu V_\nu +P_\mu \, </math>
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| where <math>O</math> is an [[orthogonal matrix]] and <math>P</math> is a 4-vector. Applying this transformation twice on a [[4-vector]] gives a third transformation of the same form. The basic invariant under this transformation is the space-time length given by the distance between two [[space-time]] points given by 4-vectors ''x'' and ''y'': | |
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| :<math>r = |x - y |. \, </math>
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| These transformations are subgroups of general 1-1 conformal transformations on space-time. It is possible to extend these transformations to include all 1-1 conformal transformations on [[space-time]]
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| :<math>V_\mu ^\prime =\left( A_\tau ^\nu V_\nu +B_\tau \right) \left( C_{\tau \mu
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| }^\nu V_\nu +D_{\tau \mu }\right) ^{-1}.</math>
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| We must also have an equivalent condition to the orthogonality condition of the Poincaré transformations:
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| :<math>AA^T+BC=DD^T+CB \, </math>
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| Because one can divide the top and bottom of the transformation by <math>D,</math> we lose no generality by setting <math>D</math> to the unit matrix. We end up with
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| :<math>V_\mu ^\prime =\left( O_\mu ^\nu V_\nu +P_\tau \right) \left( \delta _{\tau
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| \mu} + Q_{\tau \mu }^\nu V_\nu \right) ^{-1}. \, </math>
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| Applying this transformation twice on a 4-vector gives a transformation of the same form. The new symmetry of 'inversion' is given by the 3-tensor <math>Q.</math> This symmetry becomes Poincaré symmetry if we set <math>Q=0.</math> When <math>Q=0</math> the second condition requires that <math>O</math> is an orthogonal matrix. This transformation is 1-1 meaning that each point is mapped to a unique point only if we theoretically include the points at infinity.
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| ==Invariants==
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| The invariants for this symmetry in 4 dimensions is unknown however it is known that the invariant requires a minimum of 4 space-time points. In one dimension, the invariant is the well known [[cross-ratio]] from [[Möbius transformation]]s:
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| :<math>\frac{(x-X)(y-Y)}{(x-Y)(y-X)}.</math>
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| Because the only invariants under this symmetry involve a minimum of 4 points, this symmetry cannot be a symmetry of point particle theory. Point particle theory relies on knowing the lengths of paths of particles through space-time (e.g., from <math>x</math> to <math>y</math>). The symmetry can be a symmetry of a [[string theory]] in which the strings are uniquely determined by their endpoints. The [[propagator]] for this theory for a string starting at the endpoints <math>(x,X)</math> and ending at the endpoints <math>(y,Y)</math> is a conformal function of the 4-dimensional invariant. A string field in endpoint-string theory is a function over the endpoints.
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| :<math>\phi(x,X). \, </math>
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| ==Physical evidence==
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| Although it is natural to generalize the Poincaré transformations in order to find hidden [[symmetries]] in physics and thus narrow down the number of possible theories of [[high-energy physics]], it is difficult to experimentally examine this symmetry as it is not possible to transform an object under this symmetry. The indirect evidence of this symmetry is given by how accurately fundamental theories of physics that are invariant under this symmetry make predictions. Other indirect evidence is whether theories that are invariant under this symmetry lead to contradictions such as giving probabilities greater than 1. So far there has been no direct evidence that the fundamental constituents of the Universe are strings. The symmetry could also be a [[broken symmetry]] meaning that although it is a symmetry of physics, the Universe has 'frozen out' in one particular direction so this symmetry is no longer evident.
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| ==See also==
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| * [[Rotation group SO(3)]]
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| * [[Coordinate rotations and reflections]]
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| * [[Spacetime symmetries]]
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| * [[CPT symmetry]]
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| * [[Field (physics)]]
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| * [[superstrings]]
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| {{DEFAULTSORT:Inversion Transformation}}
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| [[Category:Symmetry]]
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| [[Category:Conservation laws]]
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| [[Category:Functions and mappings]]
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