Abstract
There is no experimental evidence so far that could not be accommodated within the standard model. There are, however, several theoretical shortcomings which must be remedied by a more fundamental theory. The unification of forces has not really found a satisfactory formulation, since three different gauge groups U(1), SU(2), and SU(3) are used to describe the electromagnetic, weak, and strong interactions.
“To the inventor the products of his imagination appear necessary and natural, such that he does not look at them as objects of the mind, but rather as things belonging to reality, and thus he wishes them to be seen like that.”
A. Einstein*
“There is something fascinating about science. One gets such wholesale return of conjecture out of such a trifling investment of fact.”
Mark Twain. Life on the Mississippi (1874)
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© 1993 Springer-Verlag Berlin Heidelberg
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Börner, G. (1993). Grand Unification Schemes. In: The Early Universe. Texts and Monographs in Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-02918-3_6
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DOI: https://doi.org/10.1007/978-3-662-02918-3_6
Publisher Name: Springer, Berlin, Heidelberg
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