  A viable radiation dominated era in the early universe is best described by
the standard (FLRW) model of cosmology. In this short review, we demonstrate
reconstruction of the forms of F(R) in the modified theory of gravity and the
metric compatible F(T) together with the symmetric F(Q) in alternative
teleparallel theories of gravity, from different perspectives, primarily
rendering emphasis on a viable FLRW radiation era. Inflation has also been
studied for a particular choice of the scalar potential. The inflationary
parameters are found to agree appreciably with the recently released
observational data.
