Sardanashvily Gennadi A Sardanashvily & Zakharov O Zakharov 
Gauge Gravitation Theory [PDF ebook] 

This concise monograph is intended for students and scientists specializing in contemporary field theory, gravitation theory and modern differential geometry. The gauge theory as presented by the authors, incorporates Einstein’s gravity into the universal picture of fundamental interactions and clarifies its physical nature as a Higgs field. A key point advanced here is the spontaneous breakdown of space-time symmetries according to the equivalence principle. The jet manifold generalization of the fibre bundle machinery is used to describe this symmetry breaking, degenerate Hamiltonian systems and general connections.