SQG2 - Loop Quantum Gravity, Quantum Geometry, Spin Foams |
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Speaker |
Morrison, Ian |
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Talk Title |
Group Averaging for quantum fields in de Sitter |
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Abstract |
Perturbative gravity about global de Sitter space is subject to linearization-stability constraints. Such constraints imply that quantum states of matter fields couple consistently to gravity only if the matter state has vanishing de Sitter charges; i.e. only if the state is invariant under the symmetries of de Sitter space. The usual Fock spaces for matter fields contain at most one de Sitter-invariant state (the vacuum); however, using group averaging techniques one can construct a new Hilbert space of de Sitter-invariant states. This talk will review recent work on group averaging for de Sitter quantum fields. |
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