Francis-Yan Cyr-Racine
A5064297957- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Stellar, planetary, and galactic studies
- Computational Physics and Python Applications
- Adaptive optics and wavefront sensing
- Relativity and Gravitational Theory
- Black Holes and Theoretical Physics
- History and Developments in Astronomy
- Advanced Thermodynamics and Statistical Mechanics
- Geophysics and Gravity Measurements
- Superconducting and THz Device Technology
- Advanced Mathematical Theories and Applications
- Space Science and Extraterrestrial Life
- Spectroscopy and Laser Applications
- Underwater Acoustics Research
- Data-Driven Disease Surveillance
- Solar and Space Plasma Dynamics
- Quantum Mechanics and Applications
University of New Mexico
2018-2024
Harvard University
2016-2023
Harvard University Press
2020
Jet Propulsion Laboratory
2014-2016
California Institute of Technology
2011-2016
University of British Columbia
2009-2013
McGill University
2008
University of Waterloo
2006
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
This book lays out the scientific goals to be addressed by next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned consist of dedicated telescopes at South Pole, high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies crossing critical thresholds in search for B-mode polarization signature primordial gravitational waves, determination number...
Reheating is an important part of inflationary cosmology. It describes the production Standard Matter particles after phase accelerated expansion. We give a review reheating process, focusing on in-depth discussion preheating stage which characterized by exponential particle due to parametric resonance or tachyonic instability. brief overview thermalization process and end with survey some applications supersymmetric theories other issues in cosmology such as baryogenesis, dark matter metric...
Different measurements of the Hubble constant are somewhat in tension. Here, authors show that a simple effective theory neutrino self-interactions can lead to significantly different cosmology. This resolves issue while also suggesting an extra species could relate experimental anomalies. Their results suggest interesting deviations from standard cosmology may be viable.
While, to ensure successful cosmology, dark matter (DM) must kinematically decouple from the standard model plasma very early in history of Universe, it can remain coupled a bath "dark radiation" until relatively late epoch. One minimal theory that realizes such scenario is Atomic Dark Matter model, which two fermions oppositely charged under new U(1) force are initially thermal photons" but eventually recombine into neutral atom-like bound states and begin forming gravitationally-bound...
We present the first simulations within an effective theory of structure formation (ETHOS), which includes effect interactions between dark matter and radiation on linear initial power spectrum self-interactions during non-linear formation. simulate a Milky Way-like halo in four different models cold case. Our highest resolution simulation has particle mass $2.8\times 10^4\,{\rm M}_\odot$ softening length $72.4\,{\rm pc}$. demonstrate that all alternative have only negligible impact large...
We formulate an effective theory of structure formation (ETHOS) that enables cosmological to be computed in almost any microphysical model dark matter physics. This framework maps the detailed theories particle interactions into physical parameters shape linear power spectrum and self-interaction transfer cross section non-relativistic matter. These are input simulations, which follow evolution galactic distributions. Models with similar ETHOS but different physics would nevertheless result...
Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding origin evolution universe. Among science cases pursued with CMB-S4, quest for detecting primordial gravitational waves is a central driver experimental design. This work details development forecasting framework that includes power-spectrum-based semianalytic projection tool, targeted explicitly toward...
In this letter, we present an experimental benchmark of operational control methods in quantum information processors extended up to 12 qubits. We implement universal large Hilbert space using two complementary approaches and discuss their accuracy scalability. Despite decoherence, were able reach a 12-coherence state (or 12-qubits pseudo-pure cat state), decode it into 11 qubit plus one qutrit labeled observable liquid nuclear magnetic resonance processors.
If all or a fraction of the dark matter (DM) were coupled to bath radiation (DR) in early Universe, we expect combined DM-DR system give rise acoustic oscillations until it decouples from DR. Much like standard baryon oscillations, these (DAO) imprint characteristic scale, sound horizon matter, on power spectrum. We compute detail how microphysics interaction affects clustering Universe and show that DAO physics also gives unique signatures temperature polarization spectra cosmic microwave...
In the standard model neutrinos are assumed to have streamed across Universe since they last scattered when standard-model plasma temperature was $\ensuremath{\sim}\mathrm{MeV}$. The shear stress of free-streaming imprints itself gravitationally on cosmic microwave background (CMB) and makes CMB a sensitive probe neutrino scattering. Yet, presence nonstandard physics in sector may alter this chronology delay free streaming until much later epoch. We use observations constrain strength self...
Local measurements of the Hubble parameter are increasingly in tension with value inferred from a $\Lambda$CDM fit to cosmic microwave background (CMB) data. In this paper, we construct scenarios which evolving scalar fields significantly ease by adding energy Universe around recombination narrow redshift window. We identify solutions field potential $V \propto \phi^{2n}$ that have simple asymptotic behavior, both oscillatory (rocking) and rolling. These consistently describe evolution its...
We present updated constraints on the free-streaming nature of cosmological neutrinos from cosmic microwave background (CMB) power spectra, baryonic acoustic oscillation data, and local measurements Hubble constant. Specifically, we consider a Fermi-like four-fermion interaction between massless neutrinos, characterized by an effective coupling constant $ G_{\rm eff}$, resulting in neutrino opacity $\dot{\tau}_\nu\propto eff}^2 T_\nu^5$. Using conservative prior parameter...
We demonstrate that self-interacting dark matter models with interactions mediated by light particles can have significant deviations in the power spectrum and detailed structure of galactic halos when compared to a standard cold scenario. While these take form suppression small-scale are some ways similar warm matter, much wider range possible phenomenology. A long-range force introduce multiple scales initial spectrum, acoustic oscillations an exponential cutoff spectrum. Using simulations...
We perform a detailed study of the weak interactions standard model neutrinos with primordial plasma and their effect on resonant production sterile neutrino dark matter. Motivated by issues in cosmological structure formation small scales, reported x-ray signals that could be due to decay, we consider 7 keV-scale neutrinos. Oscillation-driven such occurs at temperatures $T\ensuremath{\gtrsim}100\text{ }\text{ }\mathrm{MeV}$, where two significant effects weakly charged species plasma: (1)...
The distribution of matter fluctuations in our universe is key for understanding the nature dark and physics early cosmos. Different observables have been able to map this at large scales, corresponding wavenumbers $k\lesssim 10$ Mpc$^{-1}$, but smaller scales remain much less constrained. 21-cm line a promising tracer stellar formation, which took place small haloes (with masses $M\sim 10^6-10^8M_\odot$), formed out overdensities with as $k\approx100$ Mpc$^{-1}$. Here we forecast how well...