Search Results for author:
Found 20 papers, 18 papers with code
PAPERCLIP: Associating Astronomical Observations and Natural Language with Multi-Modal Models
We present PAPERCLIP (Proposal Abstracts Provide an Effective Representation for Contrastive Language-Image Pre-training), a method which associates astronomical observations imaged by telescopes with natural language using a neural network model.
A point cloud approach to generative modeling for galaxy surveys at the field level
We introduce a diffusion-based generative model to describe the distribution of galaxies in our Universe directly as a collection of points in 3-D space (coordinates) optionally with associated attributes (e. g., velocities and masses), without resorting to binning or voxelization.
Data Compression and Inference in Cosmology with Self-Supervised Machine Learning
The influx of massive amounts of data from current and upcoming cosmological surveys necessitates compression schemes that can efficiently summarize the data with minimal loss of information.
Hierarchical Neural Simulation-Based Inference Over Event Ensembles
When analyzing real-world data it is common to work with event ensembles, which comprise sets of observations that collectively constrain the parameters of an underlying model of interest.
Inferring subhalo effective density slopes from strong lensing observations with neural likelihood-ratio estimation
Strong gravitational lensing has emerged as a promising approach for probing dark matter models on sub-galactic scales.
Uncovering dark matter density profiles in dwarf galaxies with graph neural networks
Dwarf galaxies are small, dark matter-dominated galaxies, some of which are embedded within the Milky Way.
Strong Lensing Source Reconstruction Using Continuous Neural Fields
From the nature of dark matter to the rate of expansion of our Universe, observations of distant galaxies distorted through strong gravitational lensing have the potential to answer some of the major open questions in astrophysics.
Machine Learning and Cosmology
Methods based on machine learning have recently made substantial inroads in many corners of cosmology.
A neural simulation-based inference approach for characterizing the Galactic Center $γ$-ray excess
The nature of the Fermi gamma-ray Galactic Center Excess (GCE) has remained a persistent mystery for over a decade.
Inferring dark matter substructure with astrometric lensing beyond the power spectrum
Astrometry -- the precise measurement of positions and motions of celestial objects -- has emerged as a promising avenue for characterizing the dark matter population in our Galaxy.
Semi-parametric $γ$-ray modeling with Gaussian processes and variational inference
Mismodeling the uncertain, diffuse emission of Galactic origin can seriously bias the characterization of astrophysical gamma-ray data, particularly in the region of the Inner Milky Way where such emission can make up over 80% of the photon counts observed at ~GeV energies.
Edges and Endpoints in 21-cm Observations from Resonant Photon Production
Within the context of a kinetically mixed dark photon, we demonstrate how resonant dark photon-to-photon conversions can imprint distinctive spectral features in the observed 21-cm brightness temperature, with implications for current, upcoming, and proposed experiments targeting the cosmic dawn and the dark ages.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
Modeling Dark Photon Oscillations in Our Inhomogeneous Universe
A dark photon may kinetically mix with the Standard Model photon, leading to observable cosmological signatures.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
The Power of Halometry
Astrometric weak gravitational lensing is a powerful probe of the distribution of matter on sub-Galactic scales, which harbor important information about the fundamental nature of dark matter.
Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics High Energy Physics - Phenomenology
Dark Photon Oscillations in Our Inhomogeneous Universe
A dark photon may kinetically mix with the ordinary photon, inducing oscillations with observable imprints on cosmology.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
Mining for Dark Matter Substructure: Inferring subhalo population properties from strong lenses with machine learning
The subtle and unique imprint of dark matter substructure on extended arcs in strong lensing systems contains a wealth of information about the properties and distribution of dark matter on small scales and, consequently, about the underlying particle physics.
Extragalactic Searches for Dark Matter Annihilation
This framework is then applied to Fermi data and existing group catalogs to search for annihilating dark matter in extragalactic galaxies and clusters.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
Mapping Extragalactic Dark Matter Annihilation with Galaxy Surveys: A Systematic Study of Stacked Group Searches
Applying this procedure to a catalog of sources, one can create a full-sky map of the brightest extragalactic dark matter targets in the nearby Universe ($z\lesssim 0. 03$), supplementing sources of dark matter annihilation from within the Local Group.
Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Phenomenology
A Search for Dark Matter Annihilation in Galaxy Groups
We use 413 weeks of publicly-available $\textit{Fermi}$ Pass 8 gamma-ray data, combined with recently-developed galaxy group catalogs, to search for evidence of dark matter annihilation in extragalactic halos.
Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Phenomenology
NPTFit: A code package for Non-Poissonian Template Fitting
The NPTF was first applied to Fermi gamma-ray data to give evidence that the excess of ~GeV gamma-rays observed in the inner regions of the Milky Way likely arises from a population of sub-threshold point sources, and the NPTF has since found additional applications studying sub-threshold extragalactic sources at high Galactic latitudes.
High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics High Energy Physics - Phenomenology
