field arising from special relativity
The velocities u and v of two bodies moving along a line obey, by the special theory of relativity, the addition rule
u⊕v:=u+v1+uvc2, | (1) |
where c is the velocity of light. As c is unreachable for any material body, it
plays for the velocities of the bodies the role of the infinity. These velocities v
thus satisfy always
|v|<c. |
By (1) we get
c⊕c=c,c⊕v=c |
for |v|<c; so c behaves like the infinity.
One can define the mapping (http://planetmath.org/mapping) f:ℝ→(-c,c)=S by setting
f(x):=ctanhx | (2) |
which is easily seen to be a bijection.
Define also the binary operation (http://planetmath.org/binaryoperation) ⊙
for the numbers (http://planetmath.org/number) u,v of the
open interval
(http://planetmath.org/interval)
(-c,c) by
u⊙v=ctanh[(artanhuc)(artanhvc)]. | (3) |
Then the system (S,⊕,⊙) may be checked to be a ring
and the bijective mapping (2) to be
homomorphic (http://planetmath.org/structurehomomorphism):
f(x+y)=f(x)⊕f(y),f(xy)=f(x)⊙f(y) |
Consequently, the system (S,⊕,⊙), as the
homomorphic image (http://planetmath.org/homomorphicimageofgroup) of
the field (ℝ,+,⋅), also itself is a field.
Baker [1] calls the numbers of the set S, i.e. (-c,c),
the Einstein numbers.
References
- 1 G. A. Baker, Jr.: “Einstein numbers”. –Amer. Math. Monthly 61 (1954), 39–41.
-
2
H. T. Davis: College algebra
. Prentice-Hall, N.Y. (1940), 351.
- 3 T. Gregor & J. Haluška: Two-dimensional Einstein numbers and associativity. http://arxiv.org/abs/1309.0660arXiv (2013)
Title | field arising from special relativity |
---|---|
Canonical name | FieldArisingFromSpecialRelativity |
Date of creation | 2016-04-20 13:42:53 |
Last modified on | 2016-04-20 13:42:53 |
Owner | pahio (2872) |
Last modified by | pahio (2872) |
Numerical id | 8 |
Author | pahio (2872) |
Entry type | Topic |