TY - JOUR

T1 - Observational constraints on generalized Proca theories

AU - De Felice, Antonio

AU - Heisenberg, Lavinia

AU - Tsujikawa, Shinji

N1 - Funding Information:
A.D.F. is supported by JSPS KAKENHI Grants No. 16K05348 and No. 16H01099. L.H. acknowledges financial support from Dr. Max Rssler, the Walter Haefner Foundation, and the ETH Zurich Foundation. S.T. is supported by the Grant-in-Aid for Scientific Research Fund of the JSPS No. 16K05359 and a MEXT KAKENHI Grant-in-Aid for Scientific Research on Innovative Areas Cosmic Acceleration (No. 15H05890).
Publisher Copyright:
© 2017 American Physical Society.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - In a model of the late-time cosmic acceleration within the framework of generalized Proca theories, there exists a de Sitter attractor preceded by the dark energy equation of state wDE=-1-s, where s is a positive constant. We run the Markov-chain-Monte Carlo code to confront the model with the observational data of the cosmic microwave background (CMB), baryon acoustic oscillations, supernovae type Ia, and local measurements of the Hubble expansion rate for the background cosmological solutions and obtain the bound s=0.254-0.097+0.118 at 95% confidence level (C.L.). Existence of the additional parameter s to those in the Λ-cold-dark-matter (ΛCDM) model allows to reduce tensions of the Hubble constant H0 between the CMB and the low-redshift measurements. Including the cosmic growth data of redshift-space distortions in the galaxy power spectrum and taking into account no-ghost and stability conditions of cosmological perturbations, we find that the bound on s is shifted to s=0.16-0.08+0.08 (95% C.L.) and hence the model with s>0 is still favored over the ΛCDM model. Apart from the quantities s,H0 and the today's matter density parameter Ωm0, the constraints on other model parameters associated with perturbations are less stringent, reflecting the fact that there are different sets of parameters that give rise to a similar cosmic expansion and growth history.

AB - In a model of the late-time cosmic acceleration within the framework of generalized Proca theories, there exists a de Sitter attractor preceded by the dark energy equation of state wDE=-1-s, where s is a positive constant. We run the Markov-chain-Monte Carlo code to confront the model with the observational data of the cosmic microwave background (CMB), baryon acoustic oscillations, supernovae type Ia, and local measurements of the Hubble expansion rate for the background cosmological solutions and obtain the bound s=0.254-0.097+0.118 at 95% confidence level (C.L.). Existence of the additional parameter s to those in the Λ-cold-dark-matter (ΛCDM) model allows to reduce tensions of the Hubble constant H0 between the CMB and the low-redshift measurements. Including the cosmic growth data of redshift-space distortions in the galaxy power spectrum and taking into account no-ghost and stability conditions of cosmological perturbations, we find that the bound on s is shifted to s=0.16-0.08+0.08 (95% C.L.) and hence the model with s>0 is still favored over the ΛCDM model. Apart from the quantities s,H0 and the today's matter density parameter Ωm0, the constraints on other model parameters associated with perturbations are less stringent, reflecting the fact that there are different sets of parameters that give rise to a similar cosmic expansion and growth history.

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U2 - 10.1103/PhysRevD.95.123540

DO - 10.1103/PhysRevD.95.123540

M3 - Article

AN - SCOPUS:85022339047

VL - 95

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 12

ER -