General relativity and gravity

  • Article
    | Open Access

    Kilonovae observations can be used to out constraints on the Hubble constant (H0). Here, the authors show H0 measurements by combining light curves of four short gamma-ray burts with GW170817 are about a factor of 2-3 more precise than the standard-siren measurements using only gravitational-waves.

    • Michael W. Coughlin
    • , Sarah Antier
    •  & Nandita Khetan
  • Article
    | Open Access

    Independently measuring the tidal deformability and the fundamental oscillation mode (fmode) frequency enables tests of gravity and the nature of compact binaries. Here, the authors constrain the f-mode frequencies of the companions of GW170817 from direct measurements, demonstrating gravitational wave asteroseismology with binary inspiral signals alone.

    • Geraint Pratten
    • , Patricia Schmidt
    •  & Tanja Hinderer
  • Article
    | Open Access

    It has been conjectured that gravity may emerge from an entropic force arising on a holographic screen due to its purportedly intrinsic thermodynamic properties. Here, the authors test this conjecture by demonstrating that this key assumption of entropic force is inconsistent with general relativity.

    • Zhi-Wei Wang
    •  & Samuel L. Braunstein