Quantum corrections to the Mukhanov-Sasaki equations

Understand

Recently, a lot of attention has been paid to the modifications of the power spectrum of primordial fluctuations caused by quantum cosmology effects.

• The origin of these modifications are corrections to the Mukhanov-Sasaki equations that govern the propagation of the primeval cosmological perturbations.
• The specific form of these corrections depends on a series of details of the quantization approach and of the prescription followed to implement it.
• Generally, nonetheless, the complexity of the theoretical quantum formulation is simplified in practice appealing to a semiclassical or effective approximation, in order to perform concrete numerical computations.