117 citations · 970 across the 29 of their papers we have counts for
29 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…
Fingerprints of a Non-Inflationary Universe from Massive Fields
Jerome Quintin, Xingang Chen, Reza Ebadi
We construct explicit models of classical primordial standard clocks in an alternative to inflation, namely the slowly contracting ekpyrotic scenario. We study the phenomenology of…
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…
A small Universe
Jean-Luc Lehners, Jerome Quintin
Many cosmological models assume or imply that the total size of the universe is very large, perhaps even infinite. Here we argue instead that the universe might be comparatively sm…
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…
Uses of Complex Metrics in Cosmology
Caroline Jonas, Jean-Luc Lehners, Jerome Quintin
Complex metrics are a double-edged sword: they allow one to replace singular spacetimes, such as those containing a big bang, with regular metrics, yet they can also describe unphy…
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…
Cosmology at the top of the tower
Jerome Quintin, Heliudson Bernardo, Guilherme Franzmann
The cosmology of the fully -corrected duality-invariant action for the Neveu-Schwarz sector of string theory is revisited, with special emphasis on its coupling to matter sourc…
Cosmological consequences of a principle of finite amplitudes
Caroline Jonas, Jean-Luc Lehners, Jerome Quintin
Over 30 years ago, Barrow & Tipler proposed the principle according to which the action integrated over the entire 4-manifold describing the universe should be finite. Here we expl…
Quantum Circuit Complexity of Primordial Perturbations
Jean-Luc Lehners, Jerome Quintin
We study the quantum circuit complexity of cosmological perturbations in different models of the early universe. A natural measure for the complexity of cosmological perturbations…
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…
Stringy black-hole gas in -corrected dilaton gravity
Jerome Quintin, Robert H. Brandenberger, Maurizio Gasperini +1
We discuss the properties of the gas of primordial `stringy' black holes possibly formed in the high-curvature phase preceding the bouncing transition to the phase of standard cosm…
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…
Constraining interacting dark energy with CMB and BAO future surveys
Larissa Santos, Wen Zhao, Elisa G. M. Ferreira +1
In this paper, we perform a forecast analysis to test the capacity of future baryon acoustic oscillation (BAO) and cosmic microwave background (CMB) experiments to constrain phenom…
Cosmological perturbations and stability of nonsingular cosmologies with limiting curvature
Daisuke Yoshida, Jerome Quintin, Masahide Yamaguchi +1
We revisit nonsingular cosmologies in which the limiting curvature hypothesis is realized. We study the cosmological perturbations of the theory and determine the general criteria…
Matter bounce cosmology with a generalized single field: non-Gaussianity and an extended no-go theorem
Yu-Bin Li, Jerome Quintin, Dong-Gang Wang +1
We extend the matter bounce scenario to a more general theory in which the background dynamics and cosmological perturbations are generated by a -essence scalar field with an ar…
Evolution of Cataclysmic Variables and Related Binaries Containing a White-Dwarf
B. Kalomeni, L. Nelson, S. Rappaport +3
We present a binary evolution study of cataclysmic variables (CVs) and related systems with white dwarf accretors, including for example, AM CVn systems, classical novae, supersoft…
Black hole formation in a contracting universe
Jerome Quintin, Robert H. Brandenberger
We study the evolution of cosmological perturbations in a contracting universe. We aim to determine under which conditions density perturbations grow to form large inhomogeneities…
Evolution of cosmological perturbations and the production of non-Gaussianities through a nonsingular bounce: Indications for a no-go theorem in single field matter bounce cosmologies
Jerome Quintin, Zeinab Sherkatghanad, Yi-Fu Cai +1
Assuming that curvature perturbations and gravitational waves originally arise from vacuum fluctuations in a matter-dominated phase of contraction, we study the dynamics of the cos…
Searching for features of a string-inspired inflationary model with cosmological observations
Yi-Fu Cai, Elisa G. M. Ferreira, Bin Hu +1
The latest Planck results show a power deficit in the temperature anisotropies near in the cosmic microwave background (CMB). This observation can hardly be expla…