Systematic study of background cosmology in unitary Poincaré gauge theories with application to emergent dark radiation and $H_0$ tension - INSPIRE

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Systematic study of background cosmology in unitary Poincaré gauge theories with application to emergent dark radiation and $H_0$ tension

W.E.V. Barker
(
- Cambridge U. and
- Cambridge U., KICC
)
,
A.N. Lasenby
(
- Cambridge U. and
- Cambridge U., KICC
)
,
M.P. Hobson
(
- Cambridge U.
)
,
W.J. Handley
(
- Cambridge U. and
- Cambridge U., KICC
)

Mar 12, 2020

31 pages

Published in:

Phys.Rev.D 102 (2020) 2, 024048

Published: Jul 17, 2020

e-Print:

2003.02690 [gr-qc]

DOI:

10.1103/PhysRevD.102.024048

View in:

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Abstract: (APS)

We propose a one-parameter extension to ΛCDM, expected to strongly affect cosmological tensions. An effective dark radiation component in the early Universe redshifts away as hot dark matter, then quintessence, tracking the dominant equation-of-state parameter and leaving a falsifiable torsion field in the current epoch. This picture results from a new Poincaré gauge theory (PGT), one of the most promising among the latest batch of 58 PGTs found to be both power-counting renormalizable and free from ghosts and tachyons. We systematically categorize the cosmologies of 33 of these PGTs, as special cases of the most general parity-preserving, Ostrogradsky-stable PGT with a purely Yang-Mills action. The theory we consider contains two propagating massless gravitons, which may be JP=2+ (long-range gravitation and gravitational waves). A conspiracy among the coupling constants eliminates the spatial curvature k∈{±1,0} from the field equations. We show that this “k-screening” is not restricted to conformal gravity theories. The flat Friedmann equations are then emergent, with potentially tension-resolving freedom at the early scale-invariant epoch that reliably gives way to an attractorlike state of modern ΛCDM evolution. We compare with related theories and promising special cases, such as k-screened theories with negative-definite effective k, and more traditional theories with effective Λ and a JP=0- massive graviton (dark matter candidate). As a bonus, we analyze similarly constrained actions in the new extended Weyl gauge theory (eWGT). We show that in cosmology, PGT and eWGT span exactly the same classical phenomenology up to a linear map between their coupling constants, hinting at a deeper relationship between the two.

Note:

32 pages, 5 figures, 2 tables. Titular change. Updated ref. [85] and ref. [96]. Version to appear in Phys. Rev. D

General relativity, alternative theories of gravity
dark matter
tachyon
cosmological model
equation of state
quintessence
gravitation
unitarity
quantum cosmology: loop space
symmetry: transformation

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