Interacting Scalar and Electromagnetic Fields in $f(R,\,T)$ Theory of   Gravity
  Within the scope of $f(R,\,T)$ gravity we have studied the interacting scalar and electromagnetic fields in a Bianchi type I universe. It was found that if the study is confined to the case $f(R,\,T) = R + \lambda f(T)$, the system is completely given by the equations similar to Einstein gravity. Moreover, the present study imposes some severe restrictions on the field equations as well. 
Bijan Saha
gr-qc