The Well-Tempered Cosmological Constant

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dc.contributor.authorAppleby, Stephen
dc.contributor.authorLinder, Eric V.
dc.date.accessioned2019-07-20T05:35:37Z
dc.date.available2019-07-20T05:35:37Z
dc.date.issued2018-05-01
dc.descriptionEnergetic Cosmos Laboratory. ECL Publicationen_US
dc.description.abstractSelf tuning is one of the few methods for dynamically cancelling a large cosmological constantand yet giving an accelerating universe. Its drawback is that it tends to screen all sources of energydensity, including matter. We develop a model that tempers the self tuning so the dynamical scalarfield still cancels an arbitrary cosmological constant, including the vacuum energy through any highenergy phase transitions, without affecting the matter fields. The scalar-tensor gravitational actionis simple, related to cubic Horndeski gravity, with a nonlinear derivative interaction plus a tadpoleterm. Applying shift symmetry and using the property of degeneracy of the field equations we findfamilies of functions that admit de Sitter solutions with expansion rates that are independent ofthe magnitude of the cosmological constant and preserve radiation and matter dominated phases. That is, the method can deliver a standard cosmic history including current acceleration, despite the presence of a Planck scale cosmological constant.en_US
dc.identifier.citationAppleby, S. & Linder, E.V. (2018). The Well-Tempered Cosmological Constant. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1805.00470.pdfen_US
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/4027
dc.language.isoenen_US
dc.publisherNURIS; Energetic Cosmos Laboratoryen_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectThe 2nd international conference of the Energetic Cosmos Laboratory (ECL)en_US
dc.subjectEnergetic Cosmos Laboratory (ECL)en_US
dc.subjectECL19en_US
dc.titleThe Well-Tempered Cosmological Constanten_US
dc.typeArticleen_US
workflow.import.sourcescience

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