Projected Yang-Mills Theory and the MacDowell-Mansouri Analogy
Abstract
We construct Yang-Mills theories with projected curvature kinetic terms, developing their analogy with MacDowell-Mansouri gravity and their connection to nonlinear sigma models. We begin with models exhibiting explicit symmetry breaking and use them to motivate gauge-covariant Higgs extensions. For SO(2n), an orthogonal complex structure defines a degenerate kinetic operator with image su(n), while the adjoint Higgs vacuum has stabilizer U(n). We compare the fixed-projector theory with gauge-covariant formulations involving either unrestricted adjoint Higgs fields or Higgs fields constrained exactly to the orbit $SO(2n)/U(n)$. We express the Stelle-West Higgs-gravity action through a single Clifford involution whose complementary projectors select the Lorentz curvature, isolate the radial Higgs derivative, and construct the induced spacetime metric. This formulation makes the common projector structure explicit and clarifies the distinct roles of curvature projection, the internal dual, and the coframe. In the orbit-constrained Yang-Mills theory with a positive Higgs kinetic coefficient the coset connection is auxiliary and the central connection drops out of the action. A nonlinear Dirac analysis establishes a regular weak-curvature branch with 2(n2−1) physical degrees of freedom in four dimensions, locally equivalent to SU(n) Yang-Mills theory. In the unrestricted theory, normal Higgs displacements can change the kinetic rank, so this degree-of-freedom count does not automatically extend beyond the constrained field space. We also characterize possible nontrivial algebraic branches and introduce projected Pontryagin theories and a full-rank equivariant completion.
Related
BibTeX
@misc{alvarez2026projected,
title = {{Projected Yang-Mills Theory and the MacDowell-Mansouri Analogy}},
author = {Pedro D. Alvarez},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.08566},
eprint = {2610.08566},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.08566},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Projected Yang-Mills Theory and the MacDowell-Mansouri Analogy
AU - Pedro D. Alvarez
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.08566
UR - https://arxiv.org/abs/2610.08566
AB - We construct Yang-Mills theories with projected curvature kinetic terms, developing their analogy with MacDowell-Mansouri gravity and their connection to nonlinear sigma models. We begin with models exhibiting explicit symmetry breaking and use them to motivate gauge-covariant Higgs extensions. For SO(2n), an orthogonal complex structure defines a degenerate kinetic operator with image su(n), while the adjoint Higgs vacuum has stabilizer U(n). We compare the fixed-projector theory with gauge-covariant formulations involving either unrestricted adjoint Higgs fields or Higgs fields constrained exactly to the orbit $SO(2n)/U(n)$. We express the Stelle-West Higgs-gravity action through a single Clifford involution whose complementary projectors select the Lorentz curvature, isolate the radial Higgs derivative, and construct the induced spacetime metric. This formulation makes the common projector structure explicit and clarifies the distinct roles of curvature projection, the internal dual, and the coframe. In the orbit-constrained Yang-Mills theory with a positive Higgs kinetic coefficient the coset connection is auxiliary and the central connection drops out of the action. A nonlinear Dirac analysis establishes a regular weak-curvature branch with 2(n^2−1) physical degrees of freedom in four dimensions, locally equivalent to SU(n) Yang-Mills theory. In the unrestricted theory, normal Higgs displacements can change the kinetic rank, so this degree-of-freedom count does not automatically extend beyond the constrained field space. We also characterize possible nontrivial algebraic branches and introduce projected Pontryagin theories and a full-rank equivariant completion.
ER -