  Isolated pulsars are rotating neutron stars with accurately measured angular
velocities $\Omega$, and their time derivatives which show unambiguously that
the pulsars are slowing down. Although the exact mechanism of the spin-down is
a question of debate in detail, the commonly accepted view is that it arises
through emission of magnetic dipole radiation (MDR) from a rotating magnetized
body. Other processes, including the emission of gravitational radiation, and
of relativistic particles (pulsar wind), are also being considered. The
calculated energy loss by a rotating pulsar with a constant moment of inertia
is assumed proportional to a model dependent power of $\Omega$. This relation
leads to the power law $\dot{\Omega}$ = -K $\Omega^{\rm n}$ where $n$ is called
the braking index. The MDR model predicts $n$ exactly equal to 3. Selected
observations of isolated pulsars provide rather precise values of $n$,
individually accurate to a few percent or better, in the range 1$ <$ n $ < $
2.8, which is consistently less than the predictions of the MDR model. In spite
of an extensive investigation of various modifications of the MDR model, no
satisfactory explanation of observation has been found as yet.
  We employ four physically realistic equations of state, and two computational
codes, to model the dynamical effects of rotation on the braking index in the
MDR model. In addition to this we simulate an effect on moment of inertia where
we assume a certain amount of superfluid matter has manifest between the crust
and core region of the star thus essentially eliminating momentum transfer
between the two regions. We find that the effects of rotation on braking index
are significant at high frequencies, but have little effect at frequencies
consistent with the most accurately measured pulsars to-date.
