  Big Bang Nucleosynthesis provides us with an observational insight into the
very early Universe. Since this mechanism of light element synthesis comes out
of the standard model of particle cosmology which follows directly from General
Relativity, it is expected that any modifications to GR will result in
deviations in the predicted observable parameters which are mainly, the
neutron-to-proton ratio and the baryon-to-photon ratio. We use the measured
neutron-to-proton ratio and compare the theoretically obtained expressions to
constrain two models in the framework of $ f(T,\mathcal{T}) $ gravity. The
theoretically constrained models are then tested against observational data
from the Hubble dataset and the $ \Lambda $CDM model to explain the accelerated
expansion of the Universe.
