The possibility of modifying and enhancing the rates of photochemical reactions by strong coupling to optical cavities has attracted the excitement of the polariton chemistry community in recent years . Following experimental demonstrations of chemical rate modification under the vibrational strong coupling (VSC) regime , recent works in the electronic strong coupling (ESC) regime have demonstrated the modification and enhancement of photochemical reactions inside optical cavities . While these recent polariton photochemistry experiments have yet to be fully understood with detailed microscopic theory , there have been numerous theoretical proposals that predict ESC photochemical/photophysical rate modifications inside the cavity for a variety of model systems, such as photoinduced charge transfer , singlet fission , inter-system crossing , photodissociation , and photoisomerization .