H ₀ Tension and the Phantom Regime: A Case Study in Terms of an Infrared f(T) Gravity

Abstract

We propose an f (T ) teleparallel gravity theory including a torsional infrared (IR) correction. We show that the governing Friedmann's equations of a spatially flat universe include a phantom-like effective dark energy term sourced by the torsion IR correction. As has been suggested, this phantom phase does indeed act as to reconcile the tension between local and global measurements of the current Hubble value H 0 . The resulting cosmological model predicts an electron scattering optical depth τ e ≈ 0.058 at reionization redshift z re ∼ 8.1, in agreement with observations. The predictions are however in contradiction with baryon acoustic oscillations (BAO) measurements, particularly the distance indicators. We argue that this is the case with any model with a phantom dark energy model that has effects significant enough at redshifts z 2 as to be currently observable. The reason being that such a scenario introduces systematic differences in terms of distance estimates in relation to the standard model; e.g., if the angular diameter distance to the recombination era is to be kept constant while H 0 is increased in the context of a phantom scenario, the distances there are systematically overestimated to all objects at redshifts smaller than recombination. But no such discrepancies exist between ΛCDM predictions and current data for z 2.

Flat Connection for Rotating Vacuum Spacetimes in Extended Teleparallel Gravity Theories

“…[63,64]). Hopefully the present work will also contribute to the prospective use of the phenomenology of black holes to test teleparallel theories, like cosmology [65][66][67][68][69][70][71][72] and gravitational waves [73][74][75][76][77]. Funding: This research was funded by the Estonian Research Council through the projects IUT02-27, PUT790, and PRG356, as well as by the European Regional Development Fund through the Center of Excellence TK133 "The Dark Side of the Universe".…”

A model for core formation in dark matter haloes and ultra-diffuse galaxies by outflow episodes

“…In this model, core formation occurs from dark matter particles experiencing successive 'kicks' resulting from feedback-induced stochastic potential fluctuations, which cumulatively lead the particles to deviate from their trajectories as in a diffusion process. In the context of a fuzzy dark matter halo, Bar-Or et al (2018) similarly describe the effect on stars and black holes of stochastic density fluctuations due to the quantum nature of the dark matter particles they assume while Marsh & Niemeyer (2018) and El-Zant et al (2019) use the El-Zant et al (2016) model to place constraints on the fuzzy dark matter particle mass. .…”

Phenomenological reconstruction of f(T) teleparallel gravity

“…ΛCDM model [50]. [52,53] or by utilizing infrared gravity [54], see also [55,56]. In modified gravity framework one may search for an explanation for the accelerated expansion without assuming DE (cosmological constant), however we should not expect great deviations from the ΛCDM scenario.…”

“…In fact, the local CMB and BAO observations (preassume ΛCDM model) favor a value of H 0 ≃ 68 km/s/Mpc and Ω m,0 ≃ 0.3, this is on contrary to the global SNIa and H 0 observations (model independent) which favor a larger H 0 ≃ 73 km/s/Mpc and smaller Ω m,0 ≃ 0.26. However, several approaches have been suggested to to reconcile local with global measurements by introducing dark neutrino species [51], using dynamical phantom DE [52,53] or by utilizing infrared gravity [54], see also [55,56]. In modified gravity framework one may search for an explanation for the accelerated expansion without assuming DE (cosmological constant), however we should not expect great deviations from the ΛCDM scenario.…”