Tuning the cosmological constant, broken scale invariance, unitarity
Abstract
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 FierzPauli 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 finetuning. Models based on four form field strength show similarities with explicit scale symmetry breaking due to quantisation conditions.
 Authors:

 Bethe Center for Theoretical Physics,Nussallee 12, 53115 Bonn (Germany)
 Publication Date:
 Sponsoring Org.:
 SCOAP3, CERN, Geneva (Switzerland)
 OSTI Identifier:
 22572098
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2016; Journal Issue: 06; Other Information: PUBLISHERID: JCAP06(2016)028; OAI: oai:repo.scoap3.org:15991; ccby Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 14757516
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 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
Citation Formats
Förste, Stefan, Manz, Paul, and Physikalisches Institut der Universität Bonn,Nussallee 12, 53115 Bonn. Tuning the cosmological constant, broken scale invariance, unitarity. United States: N. p., 2016.
Web. doi:10.1088/14757516/2016/06/028.
Förste, Stefan, Manz, Paul, & Physikalisches Institut der Universität Bonn,Nussallee 12, 53115 Bonn. Tuning the cosmological constant, broken scale invariance, unitarity. United States. doi:10.1088/14757516/2016/06/028.
Förste, Stefan, Manz, Paul, and Physikalisches Institut der Universität Bonn,Nussallee 12, 53115 Bonn. Fri .
"Tuning the cosmological constant, broken scale invariance, unitarity". United States. doi:10.1088/14757516/2016/06/028.
@article{osti_22572098,
title = {Tuning the cosmological constant, broken scale invariance, unitarity},
author = {Förste, Stefan and Manz, Paul and Physikalisches Institut der Universität Bonn,Nussallee 12, 53115 Bonn},
abstractNote = {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 FierzPauli 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 finetuning. Models based on four form field strength show similarities with explicit scale symmetry breaking due to quantisation conditions.},
doi = {10.1088/14757516/2016/06/028},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 06,
volume = 2016,
place = {United States},
year = {2016},
month = {6}
}
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