53 citations · 579 across the 48 of their papers we have counts for
48 papers · 1 filter
Non-Gaussianities as a Signature of Quantumness of Quantum Cosmology
Hervé Bergeron, Przemysław Małkiewicz, Patrick Peter
We show that the consistent application of the rules of quantum mechanics to cosmological systems inevitably results in the so-called multiverse states in which neither the backgro…
Quantum entanglement and non-Gaussianity in the primordial Universe
Herve Bergeron, Przemyslaw Malkiewicz, Patrick Peter
We propose a new method to investigate signatures of a quantum gravity phase in the primordial state of cosmological perturbations. We formulate and study a quantum model of a pert…
Time problem in primordial perturbations
Alice Boldrin, Przemysław Małkiewicz, Patrick Peter
We study the non-unitary relation between quantum gravitational models defined using different internal times. We show that despite the non-unitarity, it is possible to provide a p…
Relativistic modeling of cosmological structures with Bianchi IX spacetimes
Przemyslaw Malkiewicz, Jan J. Ostrowski, Ismael Delgado Gaspar
We develop a relativistic framework to investigate the evolution of cosmological structures from the initial density perturbations to the highly nonlinear regime. Our approach invo…
Can a quantum mixmaster universe undergo a spontaneous inflationary phase?
Herve Bergeron, Jaime de Cabo Martin, Jean-Pierre Gazeau +1
We study a semiclassical model of the mixmaster universe. We first derive the quantum model and then introduce its semiclassical approximation. We employ a general integral quantiz…
Ambiguous power spectrum from a quantum bounce
Jaime de Cabo Martin, Przemysław Małkiewicz, Patrick Peter
A quantum cosmological bouncing model may exhibit an ambiguity stemming from the nonclassical nature of the background evolution: two classically equivalent theories can produce tw…