117 citations · 970 across the 29 of their papers we have counts for
8 papers · 1 filter
How Much NEC Breaking Can the Universe Endure?
Elly Moghtaderi, Brayden R. Hull, Jerome Quintin +1
Quantum fields can notoriously violate the null energy condition (NEC). In a cosmological context, NEC violation can lead to, e.g., dark energy at late times with an equation-of-st…
Delicate curvature bounces in the no-boundary wave function and in the late universe
Jean-Luc Lehners, Jerome Quintin
Theoretical considerations motivate us to consider vacuum energy to be able to decay and to assume that the spatial geometry of the universe is closed. Combining both aspects leads…
On the initial singularity and extendibility of flat quasi-de Sitter spacetimes
Ghazal Geshnizjani, Eric Ling, Jerome Quintin
Inflationary spacetimes have been argued to be past geodesically incomplete in many situations. However, whether the geodesic incompleteness implies the existence of an initial spa…
Microphysical manifestations of viscosity and consequences for anisotropies in the very early universe
Chandrima Ganguly, Jerome Quintin
It has been known that a non-perfect fluid that accounts for dissipative viscous effects can evade a highly anisotropic chaotic mixmaster approach to a singularity. Viscosity is of…
Theories with limited extrinsic curvature and a nonsingular anisotropic universe
Yuki Sakakihara, Daisuke Yoshida, Kazufumi Takahashi +1
We propose a class of theories that can limit scalars constructed from the extrinsic curvature. Applied to cosmology, this framework allows us to control not only the Hubble parame…
Cuscuton gravity as a classically stable limiting curvature theory
Jerome Quintin, Daisuke Yoshida
Finding effective theories of modified gravity that can resolve cosmological singularities and avoid other physical pathologies such as ghost and gradient instabilities has turned…
Maximal extensions and singularities in inflationary spacetimes
Daisuke Yoshida, Jerome Quintin
Extendibility of inflationary spacetimes with flat spatial geometry is investigated. We find that the past boundary of an inflationary spacetime becomes a so-called parallely propa…
Matter creation in a nonsingular bouncing cosmology
Jerome Quintin, Yi-Fu Cai, Robert H. Brandenberger
We examine reheating in the two-field matter bounce cosmology. In this model, the universe evolves from a matter-dominated phase of contraction to an Ekpyrotic phase of contraction…