  We investigate effects of strong correlation on the surface state of
topological insulator (TI). We argue that electrons in the regime of crossover
from weak anti-localization to weak localization, are strongly correlated and
calculate magneto-transport coefficients of TI using gauge gravity principle.
Then, we examine, magneto-conductivity (MC) formula and find excellent
agreement with the data of chrome doped Bi$_{2}$Te$_{3}$ in the crossover
regime. We also find that cusp-like peak in MC at low doping is absent, which
is natural since quasi-particles disappear due to the strong correlation.
