Constraints on Macroscopic Gravity from Planck

ORAL · Invited

Abstract

We use the exact and covariant averaging framework of macroscopic gravity (MG) to study the relativistic corrections to cosmology due to non-linear phenomena occurring at small scales. We present constraints on MG using the cosmic microwave background (CMB) temperature anisotropy data from Planck, and other cosmological probes. For the MG model, the effects of small-scale structure on the homogeneous and isotropic background and the evolution of large-scale structure can be encapsulated by just one parameter ($\Omega_\mathcal{A}$). We find that $\Omega_\mathcal{A}$ is close to consistent with zero and can be constrained to $-0.03 \le \Omega_{\mathcal{A}} \le 0$ (at the 95\% CL). The strong correlation between $\Omega_\mathcal{A}$ and $\Omega_\Lambda$, $\sigma_8$ and $H_0$, leads to significant increase in the error bars associated with those values.

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Authors

  • Tharake Wijenayake

    University of Texas at Dallas

  • Arthur Sweeney

    Lee College, Baytown, TX, Lamar University, University of Texas at Arlington, Angelo State University, Rice University, Texas State University, College of William and Mary and National Institute of Aerospace, Nanyang Technological University, China Jiliang University, Baylor University, Louisiana State University, College of William and Mary, University of Oklahoma, University of Texas at Dallas, Univ of Texas, Austin, Texas State Univ-San Marcos, University of Cambridge, University of Texas at Austin, Indiana University - Bloomington, Lamar Univiversity, University of Cincinnati, Deartment of Physics, University of Texas, Arlington, Texas A&M University, College Station, University of Texas - Dallas, University of Dallas

  • Mustapha Ishak

    University of Texas at Dallas