Constraining f(T) teleparallel gravity by Big Bang Nucleosynthesis

Understand

We use BBN observational data on primordial abundance of ${}^4He$ to constrain f(T) gravity.

• The three most studied viable $f(T)$ models, namely the power law, the exponential and the square-root exponential are considered, and the BBN bounds are adopted in order to extract constraints on their free parameters.
• For the power-law model, we find that the constraints are in agreement with those acquired using late-time cosmological data.
• For the exponential and the square-root exponential models, we show that for realiable regions of parameters space they always satisfy the BBN bounds.