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- W3033209170 abstract "The ten-parameter, quadratic Poincar'e gauge theory of gravity is a plausible alternative to general relativity. We show that the rich background cosmology of the gauge theory is described by a noncanonical biscalar-tensor theory in the Jordan frame: the metrical analogue. This provides a unified framework for future investigation by the broader community. For many parameter choices, the noncanonical term reduces to a Cuscuton field of the form $sqrt{|{X}^{ensuremath{phi}ensuremath{phi}}|}$. The Einstein--Cartan--Kibble--Sciama theory maps to a pure quadratic cuscuton, whereas the teleparallel theory maps to the Einstein--Hilbert Lagrangian. We apply the metrical analogue to novel unitary and power-counting-renormalizable cases of Poincar'e gauge theory. These theories support the concordance $mathrm{ensuremath{Lambda}}mathrm{CDM}$ background cosmology up to an optional, effective dark radiation component, we explain this behavior in terms of a stalled cuscuton. We also obtain two dark energy solutions from one of these cases: accelerated expansion from a negative bare cosmological constant whose magnitude is screened, and emergent dark energy to replace vanishing bare cosmological constant in $mathrm{ensuremath{Lambda}}mathrm{CDM}$." @default.
- W3033209170 created "2020-06-12" @default.
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- W3033209170 date "2020-10-01" @default.
- W3033209170 modified "2023-09-27" @default.
- W3033209170 title "Mapping Poincaré gauge cosmology to Horndeski theory for emergent dark energy" @default.
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- W3033209170 doi "https://doi.org/10.1103/physrevd.102.084002" @default.
- W3033209170 hasPublicationYear "2020" @default.
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