Observational effects from quantum cosmology

Abstract

The status of quantum cosmologies as testable models of the early universe is assessed in the context of inflation. While traditional Wheeler-DeWitt quantization is unable to produce sizable effects in the cosmic microwave background, the more recent loop quantum cosmology can generate potentially detectable departures from the standard cosmic spectrum. Thus, present observations constrain the parameter space of the model, which could be made falsifiable by near-future experiments.

Quantum cosmology and the evolution of inflationary spectra

“…However, on attempting to provide a finite prior for q 1 (and only in this context), we observe that most single field inflationary models generate a non zero tensor to scalar ratio and, therefore, we shall assume it varies in the interval [10 −4 , 0.8] . Given all such assumptions ,the prior for q 1 can be estimated to be [0,21].…”

Observational issues in loop quantum cosmology

“…The associated gravitational wave spectrum was studied in [46,62,63], while the scalar spectrum and the full set of linear-order cosmological observables were found in [48]. Observational consequences and subsequent constraints on the quantum corrections were finally studied in [15,52,64,65].…”

Detailed investigation of the duration of inflation in loop quantum cosmology for a Bianchi I universe with different inflaton potentials and initial conditions

“…Loop quantum cosmology (LQC) is a quantum theory inspired by LQG that takes into account the cosmological symmetries. Some recent reviews can be found, e.g., in [11][12][13][14][15][16][17][18][19][20][21][22]. The status of perturbations in LQC is still not fully clear.…”