5 papers
Ultraviolet Completion of the Big Bang in Quadratic Gravity
Ruolin Liu, Jerome Quintin, Niayesh Afshordi
We present a quantum quadratic gravity inflationary scenario that can accommodate the new cosmological constraints, which have disfavored Starobinsky inflation. The theory is asymp…
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…
Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
Amir Dehghani, Ghazal Geshnizjani, Jerome Quintin
Cuscuton Gravity is characterized as a scalar field that can be added to general relativity without introducing any new dynamical degrees of freedom on a cosmological background. Y…
Conformal Cores of Quantum Black Holes in Quadratic Gravity
Ruolin Liu, Jerome Quintin, Niayesh Afshordi
We explore the possibility that quadratic gravity, as a renormalizable theory, describes the interior of quantum black holes. We find new exact power-law solutions to pure quadrati…
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…