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Hi guys! I'm looking for a good introduction to Kaluza-Klein theory(ies) and would like any recommendations. Thanks :)
Kaluza-Klein theories are a type of unified field theory that attempts to unify the forces of gravity and electromagnetism by introducing additional dimensions beyond the three spatial dimensions we are familiar with.
Studying Kaluza-Klein theories can help us better understand the fundamental forces of the universe and potentially lead to a unified theory of everything. It also has implications for fields such as cosmology and high energy physics.
Some recommended readings include "The Fifth Dimension in Relativity and Cosmology" by T. Appelquist and A. Chodos, "Kaluza-Klein Theories" by S. Randjbar-Daemi and E. Sezgin, and "Kaluza-Klein Theories and Beyond" by M. Shifman.
Yes, some criticisms include the lack of experimental evidence for the existence of extra dimensions and the difficulty in incorporating quantum mechanics into these theories.
Kaluza-Klein theories are a precursor to string theory and share some similarities, such as the incorporation of extra dimensions. However, string theory goes beyond Kaluza-Klein theories by postulating that the fundamental building blocks of the universe are not particles, but strings.