Tuning the cosmological constant, broken scale invariance, unitarity
We study gravity coupled to a cosmological constant and a scale but not conformally invariant sector. In Minkowski vacuum, scale invariance is spontaneously broken. We consider small fluctuations around the Minkowski vacuum. At the linearised level we find that the trace of metric perturbations rece...
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| Veröffentlicht in: | Journal of cosmology and astroparticle physics 2016-06, Vol.2016 (6), p.28-28, Article 028 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2016 |
| creator | Förste, Stefan Manz, Paul |
| description | We study gravity coupled to a cosmological constant and a scale but not conformally invariant sector. In Minkowski vacuum, scale invariance is spontaneously broken. We consider small fluctuations around the Minkowski vacuum. At the linearised level we find that the trace of metric perturbations receives a positive or negative mass squared contribution. However, only for the Fierz-Pauli combination the theory is free of ghosts. The mass term for the trace of metric perturbations can be cancelled by explicitly breaking scale invariance. This reintroduces fine-tuning. Models based on four form field strength show similarities with explicit scale symmetry breaking due to quantisation conditions. |
| doi_str_mv | 10.1088/1475-7516/2016/06/028 |
| format | Article |
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| ispartof | Journal of cosmology and astroparticle physics, 2016-06, Vol.2016 (6), p.28-28, Article 028 |
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| language | eng |
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| source | Institute of Physics Journals |
| subjects | CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMOLOGICAL CONSTANT COSMOLOGY FLUCTUATIONS METRICS MINKOWSKI SPACE NEGATIVE MASS NONLUMINOUS MATTER PERTURBATION THEORY QUANTIZATION SCALE INVARIANCE SYMMETRY BREAKING UNITARITY VACUUM STATES |
| title | Tuning the cosmological constant, broken scale invariance, unitarity |
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