Gravity’s Islands: Parametrizing Horndeski Stability

Simple item page
dc.contributor.authorDenissenya, Mikhail
dc.contributor.authorLinder, Eric V.
dc.date.accessioned2019-07-20T05:13:26Z
dc.date.available2019-07-20T05:13:26Z
dc.date.issued2018-07-31
dc.descriptionEnergetic Cosmos Laboratory. ECL Publication, 2019en_US
dc.description.abstractCosmic acceleration may be due to modified gravity, with effective field theory or property functions describing the theory. Connection to cosmological observations through practical parametrization of these functions is difficult and also faces the issue that not all assumed time dependence or parts of parameter space give a stable theory. We investigate the relation between parametrization and stability in Horndeski gravity, showing that the results are highly dependent on the function parametrization. This can cause misinterpretations of cosmological observations, hiding and even ruling out key theoretical signatures. We discuss approaches and constraints that can be placed on the property functions and scalar sound speed to preserve some observational properties, but find that parametrizations closest to the observations, e.g. in terms of the gravitational strengths, offer more robust physical interpretations. In addition we present an example of how future observations of the B-mode polarization of the cosmic microwave background from primordial gravitational wave scan probe different aspects of gravityen_US
dc.identifier.citationDenissenya, M. & Linder, E.V. (2018). Gravity's Islands: Parametrizing Horndeski Stability. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1808.00013.pdfen_US
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/4024
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.subjectECL19en_US
dc.subjectEnergetic Cosmos Laboratory (ECL)en_US
dc.titleGravity’s Islands: Parametrizing Horndeski Stabilityen_US
dc.typeArticleen_US
workflow.import.sourcescience

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Gravity's Islands Parametrizing Horndeski Stability.pdf
Size:
1.3 MB
Format:
Adobe Portable Document Format
Description:
Article
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
6 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

The 2nd International Conference "Exploring the Energetic Universe 2019"