Abstract
Relativistic field theories with a power law decay in r−k at spatial infinity generically possess an infinite number of conserved quantities because of Lorentz invariance. Most of these are not related in any obvious way to symmetry transformations of which they would be the Noether charges. We discuss the issue in the case of a massless scalar field. By going to the dual formulation in terms of a 2-form (as was done recently in a null infinity analysis), we relate some of the scalar charges to symmetry transformations acting on the 2-form and on surface degrees of freedom that must be added at spatial infinity. These new degrees of freedom are necessary to get a consistent relativistic description in the dual picture, since boosts would otherwise fail to be canonical transformations. We provide explicit boundary conditions on the 2-form and its conjugate momentum, which involves parity conditions with a twist, as in the case of electromagnetism and gravity. The symmetry group at spatial infinity is composed of “improper gauge transformations”. It is abelian and infinite-dimensional. We also briefly discuss the realization of the asymptotic symmetries, characterized by a non trivial central extension and point out vacuum degeneracy.
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ArXiv ePrint: 1812.07445
On leave of absence from Collège de France, Paris. (Marc Henneaux)
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Henneaux, M., Troessaert, C. Asymptotic structure of a massless scalar field and its dual two-form field at spatial infinity. J. High Energ. Phys. 2019, 147 (2019). https://doi.org/10.1007/JHEP05(2019)147
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DOI: https://doi.org/10.1007/JHEP05(2019)147