Galactic rotation dynamics in f(T) gravity

Abstract

We investigate galactic rotation curves in f (T ) gravity, where T represents a torsional quantity. Our study centers on the particular Lagrangian f (T ) = T +αT n , where |n| = 1 and α is a small unknown constant. To do this we treat galactic rotation curves as being composed from two distinct features of galaxies, namely the disk and the bulge. This process is carried out for several values of the index n. The resulting curve is then compared with Milky Way profile data to constrain the value of the index n while fitting for the parameter α. These values are then further tested on three other galaxies with different morphologies. On the galactic scale we find that f (T ) gravity departs from standard Newtonian theory in an important way. For a small range of values of n we find good agreement with data without the need for exotic matter components to be introduced.

Gravitoelectromagnetism, Solar System Tests, and Weak-Field Solutions in f (T,B) Gravity with Observational Constraints

“…A number of f (T ) gravity models have shown promising results in the solar system regime [26][27][28][29], as well as in the galactic [30] and cosmological regimes [13,31,32]. Of particular interest is its effect on weak lensing in galaxygalaxy surveys [33].…”

Bouncing cosmology in f(Q) symmetric teleparallel gravity

“…Refs. [41,[53][54][55][56]. In what follows, we focus on STEGR and on a modified action containing a function of the non-metricity scalar Q.…”

Cosmological perturbations in modified teleparallel gravity models: boundary term extension

“…One of the best studied modification to GR is that of f ( • R) gravity [26,30,31], and TEGR can similarly be generalized to produce f (T ) gravity [43][44][45][46][47][48]. This has several key properties chief among which is that it produced second order field equations and has shown promise in its confrontation with observations at various scales [34,[49][50][51][52][53][54][55]. TG can also offer a path in which f ( • R) gravity is dynamically generalized by considering f (T, B) gravity where the different order contributions are decoupled from one another [56][57][58][59][60][61].…”