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2-form gauge theory dual to scalar-tensor theory
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We generalize the electromagnetic duality between a massless, canonical scalar field and a 2-form gauge field in 4-dimensional spacetime to scalar-tensor theories. We derive the action of 2-form gauge field that is dual to two kinds of scalar-tensor theories: shift symmetric K-essence theory and the shift symmetric Horndeski theory up to quadratic in scalar field. The former case, the dual 2-form has a nonlinear kinetic term. The latter case, the dual 2-form has non-trivial interactions with gravity through Einstein tensor. In both case, the duality relation is modified from usual case, that is, the dual 2-form field is not simply given by the Hodge dual of the gradient of the scalar field.
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Horndeski in motion
Shift-symmetric Horndeski scalars with a spatial gradient realize moving dark energy, with a universal momentum density T^0i = -Q lambda^i / sqrt(-g) and observable imprints on the CMB dipole and quadrupole.
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