Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-11-19
Phys.Rev.D81:085003,2010
Physics
High Energy Physics
High Energy Physics - Theory
61 pages, no figures (v2) some typos corrected
Scientific paper
10.1103/PhysRevD.81.085003
We revisit an old idea that gravity can be unified with Yang-Mills theory by enlarging the gauge group of gravity formulated as gauge theory. Our starting point is an action that describes a generally covariant gauge theory for a group G. The Minkowski background breaks the gauge group by selecting in it a preferred gravitational SU(2) subgroup. We expand the action around this background and find the spectrum of linearized theory to consist of the usual gravitons plus Yang-Mills fields charged under the centralizer of the SU(2) in G. In addition, there is a set of Higgs fields that are charged both under the gravitational and Yang-Mills subgroups. These fields are generically massive and interact with both gravity and Yang-Mills sector in the standard way. The arising interaction of the Yang-Mills sector with gravity is also standard. Parameters such as the Yang-Mills coupling constant and Higgs mass arise from the potential function defining the theory. Both are realistic in the sense explained in the paper.
Krasnov Kirill
Torres-Gomez Alexander
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