260 citations · 1.3k across the 24 of their papers we have counts for
24 papers
Contributions to the geomagnetic secular variation from a reanalysis of core surface dynamics
Olivier Barrois, Nicolas Gillet, Julien Aubert
We invert for motions at the surface of Earth's core under spatial and temporal constraints that depart from the mathematical smoothings usually employed to ensure spectral converg…
Reionisation time fields reconstruction from 21 cm signal maps
Julien Hiegel, Emilie Thélie, Dominique Aubert +6
During the Epoch of reionisation, the intergalactic medium is reionised by the UV radiation from the first generation of stars and galaxies. One tracer of the process is the 21 cm…
Topology of Reionisation times: concepts, measurements and comparisons to gaussian random field predictions
Emilie Thélie, Dominique Aubert, Nicolas Gillet +2
In the next decade, radio telescopes like the Square Kilometer Array (SKA) will explore the Universe at high redshift, and particularly during the Epoch of Reionisation (EoR). The…
DUSTiER (DUST in the Epoch of Reionization): dusty galaxies in cosmological radiation-hydrodynamical simulations of the Epoch of Reionization with RAMSES-CUDATON
Joseph S. W. Lewis, Pierre Ocvirk, Yohan Dubois +4
In recent years, interstellar dust has become a crucial topic in the study of the high and very high redshift Universe. Evidence points to the existence of high dust masses in mass…
Rapid Variations of Earth's Core Magnetic Field
V. Lesur, N. Gillet, M. D. Hammer +1
Evidence of fast variations in the Earth's core field are seen both in magnetic observatory and satellite records. We present here how they have been identified at the Earth's surf…
A first look at the topology of reionization redshifts in models of the Epoch of the Reionization
Emilie Thélie, Dominique Aubert, Nicolas Gillet +1
During the EoR, the first stars and galaxies appear while creating ionized bubbles that will eventually percolate near z=6. These ionized bubbles and percolation process are nowada…
Machine learning astrophysics from 21 cm lightcones: impact of network architectures and signal contamination
David Prelogović, Andrei Mesinger, Steven Murray +2
Imaging the cosmic 21 cm signal will map out the first billion years of our Universe. The resulting 3D lightcone (LC) will encode the properties of the unseen first galaxies and ph…
Lyman-alpha opacities at z=4-6 require low mass, radiatively-suppressed galaxies to drive cosmic reionization
Pierre Ocvirk, Joseph S. W. Lewis, Nicolas Gillet +4
The high redshift Lyman-alpha forest, in particular the Gunn-Peterson trough, is the most unambiguous signature of the neutral to ionized transition of the intergalactic medium (IG…
Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
Anton Rudakovskyi, Andrei Mesinger, Denys Savchenko +1
The number density of small dark matter (DM) halos hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties…
21cm signal predictions at Cosmic Dawn and Reionization with coupled radiative-hydrodynamics
Nicolas J. F. Gillet, Dominique Aubert, Florent G. Mertens +1
The process of heating and reionization of the Universe at high redshift links small scale structures/galaxy formation and large scale inter-galactic medium properties. Even if the…
The interplay of fast waves and slow convection in geodynamo simulations nearing Earth's core conditions
Julien Aubert, Nicolas Gillet
Ground observatory and satellite-based determinations of temporal variations in the geomagnetic field probe a decadal to annual time scale range where Earth's core slow, inertiales…
Minimum size of 21-cm simulations
Harman Deep Kaur, Nicolas Gillet, Andrei Mesinger
Cosmic 21cm interferometry is set to revolutionize our understanding of the Epoch of Reionization (EoR) and the Cosmic Dawn (CD). However, the signal has structure on a huge range…
Properties of reionization-era galaxies from JWST luminosity functions and 21-cm interferometry
Jaehong Park, Nicolas Gillet, Andrei Mesinger +1
Next generation observatories will enable us to study the first billion years of our Universe in unprecedented detail. Foremost among these are 21-cm interferometry with the HERA a…
Combining high-z galaxy luminosity functions with Bayesian evidence
Nicolas J. F. Gillet, Andrei Mesinger, Jaehong Park
Galaxy formation during the first billion years of our Universe remains a challenging problem at the forefront of astrophysical cosmology. Although these galaxies are li…
A deep learning model to emulate simulations of cosmic reionization
Jonathan Chardin, Grégoire Uhlrich, Dominique Aubert +4
We present a deep learning model trained to emulate the radiative transfer during the epoch of cosmological reionization. CRADLE (Cosmological Reionization And Deep LEarning) is an…
Spatial And Temporal Changes Of The Geomagnetic Field: Insights From Forward And Inverse Core Field Models
Nicolas Gillet
Observational constraints on geomagnetic field changes from interannual to millenial periods are reviewed, and the current resolution of field models (covering archeological to sat…
Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
Jaehong Park, Andrei Mesinger, Bradley Greig +1
The properties of the first galaxies, expected to drive the Cosmic Dawn (CD) and the Epoch of Reionization (EoR), are encoded in the 3D structure of the cosmic 21-cm signal. Parame…
Suppression of Star Formation in Low-Mass Galaxies Caused by the Reionization of their Local Neighborhood
Taha Dawoodbhoy, Paul R. Shapiro, Pierre Ocvirk +10
Photoheating associated with reionization suppressed star formation in low-mass galaxies. Reionization was inhomogeneous, however, affecting different regions at different times. T…
Deep learning from 21-cm tomography of the Cosmic Dawn and Reionization
Nicolas Gillet, Andrei Mesinger, Bradley Greig +2
The 21-cm power spectrum (PS) has been shown to be a powerful discriminant of reionization and cosmic dawn astrophysical parameters. However, the 21-cm tomographic signal is highly…
Planetary gyre, time-dependent eddies, torsional waves, and equatorial jets at the Earth's core surface
N Gillet, D Jault, C. C. Finlay
We report a calculation of time-dependent quasi-geostrophic core flows for 1940-2010. Inverting recursively for an ensemble of solutions, we evaluate the main source of uncertainti…
Cosmic Dawn (CoDa): the First Radiation-Hydrodynamics Simulation of Reionization and Galaxy Formation in the Local Universe
Pierre Ocvirk, Nicolas Gillet, Paul R. Shapiro +12
Cosmic reionization by starlight from early galaxies affected their evolution, thereby impacting reionization, itself. Star formation suppression, for example, may explain the obse…
Stochastic modelling of regional archaeomagnetic series
G. Hellio, N. Gillet, C. Bouligand +1
SUMMARY We report a new method to infer continuous time series of the declination, inclination and intensity of the magnetic field from archeomagnetic data. Adopting a Bayesian per…
Vast planes of satellites in a high resolution simulation of the Local Group: comparison to Andromeda
N. Gillet, P. Ocvirk, D. Aubert +5
We search for vast planes of satellites (VPoS) in a high resolution simulation of the Local Group performed by the CLUES project, which improves significantly the resolution of for…
The reionization of galactic satellite populations
P. Ocvirk, N. Gillet, D. Aubert +6
We use high resolution simulations of the formation of the local group post-processed by a radiative transfer code for UV photons, to investigate the reionization of the satellite…