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Departamento de Gravitación y Teoría de CamposSeminarios 2015 |
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Instituto de Ciencias Nucleares, UNAM |
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Departamento de Gravitación y Teoría de CamposSeminarios 2015 |
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Instituto de Ciencias Nucleares, UNAM |
Jueves 12 de marzo, a las 17:00 hrs en la Sala de Seminarios A2.25, 2. piso del ICN
Mikael von Strauss (Institut d'Astrophysique de Paris)
Some evidence for the existence of a nonlinear partially massless theory
of spin-2
| It has been known for more than 20 years that the free linear theory of a massive spin-2 field propagating in de Sitter admit an extra linear gauge symmetry when the mass of the spin-2 field saturates the so called Higuchi bound, relating its value to the cosmological constant. This symmetry renders the helicity 0 mode non-propagating and the theory has been dubbed partially massless. An open problem has been whether this linear symmetry can somehow be extended to a fully non-linear symmetry. The recent developments in constructing theoretically viable models for non-linear interactions of massive spin-2 fields has naturally led to revisiting this problem. While some obstacles in constructing such a theory has been discovered, there are also many hints that the theory exists and is a particular model within the ghost-free bimetric theory discussed during the lectures. I will discuss the current status of the problem and present various evidences that a non-linear partially massless theory indeed exists and why the problem may be of physical relevance. |
