Effect of Cosmic Rays on the Evolution and Momentum Deposition of
  Supernova Remnants
  Using a semianalytical approach based on the thin-shell approximation, we
calculate the long-term evolution of supernova remnants (SNRs) while also
accounting for the cosmic rays (CRs) accelerated at their blast waves. Our
solution reproduces the results of state-of-the-art hydro simulations across
the adiabatic and radiative stages for the gas-only case, and it predicts that
typical CR acceleration efficiencies ($\approx 10\%$ ) can boost SNR momentum
deposition by a factor of 2--3. This enhancement can become as large as an
order of magnitude in environments in which the gas experiences more severe
radiative losses. This result may have a crucial impact on modeling the effect
of supernova feedback on star formation and galaxy evolution.
