119 citations · 341 across the 7 of their papers we have counts for
7 papers
Pre-inflation from the multiverse: Can it solve the quadrupole problem in the cosmic microwave background?
João Morais, Mariam Bouhmadi-López, Manuel Kraemer +1
We analyze a quantized toy model of a universe undergoing eternal inflation using a quantum-field-theoretical formulation of the Wheeler-DeWitt equation. This so-called third quant…
Inter-universal entanglement in a cyclic multiverse
Salvador Robles-Perez, Adam Balcerzak, Mariusz P. Dabrowski +1
We study scenarios of parallel cyclic multiverses which allow for a different evolution of the physical constants, while having the same geometry. These universes are classically d…
Quantum-gravitational effects on gauge-invariant scalar and tensor perturbations during inflation: The slow-roll approximation
David Brizuela, Claus Kiefer, Manuel Kraemer
We continue our study on corrections from canonical quantum gravity to the power spectra of gauge-invariant inflationary scalar and tensor perturbations. A direct canonical quantiz…
Resolution of type IV singularities in quantum cosmology
Mariam Bouhmadi-Lopez, Claus Kiefer, Manuel Kraemer
We discuss the fate of classical type IV singularities in quantum cosmology. The framework is Wheeler-DeWitt quantization applied to homogeneous and isotropic universes with a perf…
Can one observe quantum-gravitational effects in the cosmic microwave background?
Manuel Kraemer
In order to find the correct theory of quantum gravity, one has to look for observational effects in any candidate theory. Here, we focus on canonical quantum gravity and calculate…
On the modification of the cosmic microwave background anisotropy spectrum from canonical quantum gravity
Donato Bini, Giampiero Esposito, Claus Kiefer +2
We evaluate the modifications to the cosmic microwave background anisotropy spectrum that result from a semiclassical expansion of the Wheeler-DeWitt equation. Recently, such an in…
Quantum Gravitational Contributions to the CMB Anisotropy Spectrum
Claus Kiefer, Manuel Kraemer
We derive the primordial power spectrum of density fluctuations in the framework of quantum cosmology. For this purpose we perform a Born-Oppenheimer approximation to the Wheeler-D…