Latest Research
Dimensionality Reduction Techniques for Statistical Inference in Cosmology
The gains we obtain are significant compared to compression methods used in the literature: up to 30% in the Figure of Merit for $\Omega_m$ and $S_8$ in a realistic Simulation Based Inference analysis that includes statistical and systematic errors.
Cosmology and Nongalactic Astrophysics
Data-Driven Modeling of Telluric Features and Stellar Variability with StellarSpectraObservationFitting.jl
A significant barrier to achieving the radial velocity (RV) measurement accuracy and precision required to characterize terrestrial mass exoplanets is the existence of time-variable features in the measured spectra, from both telluric absorption and stellar variability, which affect measured line shapes and can cause apparent RV shifts.
Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics
The picasso gas model: Painting intracluster gas on gravity-only simulations
We show that when trained on non-radiative hydrodynamic simulations, picasso can make remarkably accurate and precise predictions of intracluster gas thermodynamics.
Cosmology and Nongalactic Astrophysics
The FLAMINGO Project: An assessment of the systematic errors in the predictions of models for galaxy cluster counts used to infer cosmological parameters
Models used to predict cluster counts typically combine a model for the dark matter only (DMO) halo mass function (HMF) with an observable - mass relation that is assumed to be a power-law with lognormal scatter.
Cosmology and Nongalactic Astrophysics
A machine learning approach for computing solar flare locations in X-rays on-board Solar Orbiter/STIX
The Spectrometer/Telescope for Imaging X-rays (STIX) on-board the ESA Solar Orbiter mission retrieves the coordinates of solar flare locations by means of a specific sub-collimator, named the Coarse Flare Locator (CFL).
Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics
Efficient Compression of Redshift-Space Distortion Data for Late-Time Modified Gravity Models
Then, we apply it to current data and find hints of a suppressed matter growth in the universe at $\sim 2. 7\sigma$ C. L., in full accordance with previous works in the literature.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
A multi-dimensional view of a unified model for TDEs
According to a unified model suggested by these simulations, the spectral energy distributions (SEDs) of TDEs depend strongly on viewing angle: low [high] optical-to-X-ray ratios (OXRs) correspond to face-on [edge-on] orientations.
High Energy Astrophysical Phenomena
SPH modelling of AGB wind morphology in hierarchical triple systems \& comparison to observation of R Aql
Further, we investigate if the outflow of the AGB star R Aql could be shaped by a triple system, by post-processing one of our triple models with a radiative transfer routine, and comparing this to data of the ALMA ATOMIUM programme.
Solar and Stellar Astrophysics
A neural network emulator of the Advanced LIGO and Advanced Virgo selection function
tcallister/pdet
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For this reason, there is a growing need for alternative representations of gravitational-wave selection functions that are computationally cheap to evaluate and can be computed across a continuous range of compact binary parameters.
High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
Euclid preparation. Angular power spectra from discrete observations
The observables in galaxy surveys, such as galaxy clustering and cosmic shear, are not continuous fields, but discrete sets of data, obtained only at the positions of galaxies.
Cosmology and Nongalactic Astrophysics
