Browsing by Author "d1173233-3d15-495d-bedb-d8688dffcc3d"

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Cosmic Curvature Tested Directly from Observations

Denissenya, Mikhail; Linder, Eric V.; Shafieloo, Arman (NURIS; Energetic Cosmos Laboratory, 2018-02-13)

Cosmic spatial curvature is a fundamental geometric quantity of the Universe. We investigate a model independent, geometric approach to measure spatial curvature directly from observations,without any derivatives of data. ...
Cosmic Growth Signatures of Modified Gravitational Strength

Denissenya, Mikhail; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2018-09-05)

Cosmic growth of large scale structure probes the entire history of cosmic expansion and gravitational coupling. To get a clear picture of the effects of modification of gravity we consider a deviation in the coupling ...
Gravity’s Islands: Parametrizing Horndeski Stability

Denissenya, Mikhail; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2018-07-31)

Cosmic 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 ...
Subpercent Accurate Fitting of Modified Gravity Growth

Denissenya, Mikhail; Linder, Eric V. (NURIS; Energetic Cosmos Laboratory, 2017-09-25)

Adding to our previous method for dealing with gravitational modifications at redshiftz&3through a single parameter, we investigate treatment of lower redshift modifications to linear growth observables. We establish sub ...