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Reconstruction of a scalar-tensor theory of gravity in an accelerating universe
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The present acceleration of the Universe strongly indicated by recent observational data can be modeled in the scope of a scalar-tensor theory of gravity. We show that it is possible to determine the structure of this theory (the scalar field potential and the functional form of the scalar-gravity coupling) along with the present density of dustlike matter from the following two observable cosmological functions: the luminosity distance and the linear density perturbation in the dustlike matter component as functions of redshift. Explicit results are presented in the first order in the small inverse Brans-Dicke parameter 1/omega.
Forward citations
Cited by 8 Pith papers
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Rolling Galileons: Evolving Braiding Strength for Viable Dark Energy
Rolling Galileon gravity, with field-dependent coupling coefficients, can produce a viable phantom-crossing dark energy with healthy void screening and an acceptable fit to expansion data.
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Nonlinear reconstruction of general dark energy theories
A reconstruction method is derived that turns background expansion and linear perturbation data into full non-linear Lagrangians for quintessence, scalar-tensor, k-essence, and shift-symmetric cubic Galileon dark ener...
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Scalar-Tensor Gravity and DESI 2024 BAO data
With Planck and DESI BAO data, the Brans-Dicke Galileon model prefers a nonzero Galileon term and yields H0 = 71.0 +1.5 -1.3 km/s/Mpc, consistent with SH0ES at 1.2 sigma.
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Bridge the Cosmological Tensions with Thawing Gravity
Thawing Gravity, a scalar-tensor theory with a non-minimally coupled scalar field, fits the full cosmological dataset better than LambdaCDM and yields H0=71.78+/-0.86 and S8=0.793+/-0.012.
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Cosmological constraints on Galileon dark energy with broken shift symmetry
A broken shift symmetric cubic Galileon with a quadratic potential, fitted to DESI DR2, supernova and CMB data, is strongly favored over ΛCDM for DESY5/Union3 supernovae and reproduces the phantom-crossing equation of...
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Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI
Two phenomenological dark matter creation rates can reproduce the accelerated expansion of the universe and fit current background data as well as or slightly better than LambdaCDM for some DESI-based data combinations.
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The Status of Single Scalar Field Dark Energy
Cosmological data can constrain only a handful of EFT parameters for single-scalar dark energy; extended models show modest preference over Λ but remain underdetermined and challenged by fifth forces and screening.
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Effective Phantom Dark Energy: What Cosmological Reconstruction Does and Does Not Imply
Effective phantom dark energy is a background-level reconstruction that does not imply fundamental pathologies such as ghost instabilities or null energy condition violation by the underlying stress tensor.
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