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Conformal wave expansions for flat space amplitudes
oleh: Chang Liu, David A. Lowe
Format: | Article |
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Diterbitkan: | SpringerOpen 2021-07-01 |
Deskripsi
Abstract The extended BMS algebra contains a conformal subgroup that acts on the celestial sphere as SO(1, 3). It is of interest to perform mode expansions of free fields in Minkowski spacetime that realize this symmetry in a simple way. In the present work we perform such a mode expansion for massive scalar fields using the unitary principal series representations of SO(1, 3) with a view to developing a holographic approach to gravity in asymptotically flat spacetime. These mode expansions are also of use in studying holography in three-dimensional de Sitter spacetime.