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This study examines cosmic acceleration using teleparallel gravity with an exponential f(T) function and a hybrid scale factor that models the universe's transition from early deceleration to current acceleration. Using 31 observational Hubble data points to constrain the model, researchers found that the predicted matter-energy density and pressure evolution align with observed cosmic acceleration. The model operates within the quintessence regime and asymptotically converges toward the standard ΛCDM cosmological model.
Why it matters
This work provides an alternative theoretical framework to explain the universe's accelerated expansion without relying solely on dark energy, potentially offering new insights into fundamental gravitational physics and the nature of cosmic acceleration.
arXiv:2605.27196v1 Announce Type: cross
Abstract: This study investigates the cosmological dynamics of an accelerating universe within the framework of teleparallel gravity using an exponential f(T) functional form. To obtain exact cosmological solutions, a hybrid scale factor is employed to model the smooth transition from an early decelerated phase to the present accelerated expansion of the Universe. The physical consistency of the model is analyzed through classical energy conditions and cosmographic parameters. By constraining the model parameters using 31 Hubble data points, we find that the resulting matter-energy density and pressure evolution remain consistent with the observed cosmic acceleration. Diagnostic analysis confirms that the model remains within the quintessence regime and asymptotically approaches the {Lambda}CDM scenario.
Source: Hybrid Expansion Cosmology in f(T) Gravity: Late-Time Evolution and Observational Bounds