Astrophysical Tests of Kinematical Conformal Cosmology in Fourth-Order Conformal Weyl Gravity

Abstract

In this work we analyze kinematical conformal cosmology (KCC), an alternative cosmological model based on conformal Weyl gravity (CG), and test it against current type Ia supernova (SNIa) luminosity data and other astrophysical observations. Expanding upon previous work on the subject, we revise the analysis of SNIa data, confirming that KCC can explain the evidence for an accelerating expansion of the Universe without using dark energy or other exotic components. We obtain an independent evaluation of the Hubble constant, H 0 = 67.53 km s −1 Mpc −1 , very close to the current best estimates. The main KCC and CG parameters are re-evaluated and their revised values are found to be close to previous estimates.We also show that available data for the Hubble parameter as a function of redshift can be fitted using KCC and that this model does not suffer from any apparent age problem. Overall, KCC remains a viable alternative cosmological model, worthy of further investigation.

Wormhole geometries in fourth-order conformal Weyl gravity

“…A similar, but different approach to conformal gravity and cosmology has been proposed by one of us in a series of papers ( [21], [22], [23], [24], [25], [26]). A new model was introduced that was called kinematical conformal cosmology [21] since it was based on purely kinematic considerations without using any dynamical equation of state for the universe.…”

“…A new model was introduced that was called kinematical conformal cosmology [21] since it was based on purely kinematic considerations without using any dynamical equation of state for the universe. This model is able to account for the accelerated expansion of the universe ( [22], [26]) and may also explain the origin of some gravitational anomalies, such as the Flyby Anomaly [25].…”

Ergosphere, Photon Region Structure, and the Shadow of a Rotating Charged Weyl Black Hole

“…Along the same efforts, the fourth order theory of conformal gravity appeared as one of the alternatives to compare the theoretical results with the cosmological and astrophysical observations, and some considerable constraints have been driven. This theory was formulated by H. Weyl in 1918 [8], revived by Riegert in 1984 [9], and since then, has been applied widely to explain astrophysical phenomena (see, for example [10][11][12][13][14][15][16][17][18]).…”

Gravitational waves in conformal gravity

“…The particle content of linearized conformal gravity was considered in [32]. It had been shown that CG accommodates well with currently available SNIa and GRB samples [33][34][35]. A series of dynamical solutions in CG were found in [36].…”