Hiranya V. Peiris
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View article: Impact of redshift distribution uncertainties on Lyman-break galaxy cosmological parameter inference
Impact of redshift distribution uncertainties on Lyman-break galaxy cosmological parameter inference Open
A significant number of Lyman-break galaxies (LBGs) with redshifts $3 \lesssim z \lesssim 5$ are expected to be observed by the upcoming Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). This will enable us to probe the Uni…
View article: <tt>pop-cosmos</tt> : Insights from Generative Modeling of a Deep, Infrared-selected Galaxy Population
pop-cosmos : Insights from Generative Modeling of a Deep, Infrared-selected Galaxy Population Open
We present an extension of the pop-cosmos model for the evolving galaxy population up to redshift z ∼ 6. The model is trained on distributions of observed colors and magnitudes, from 26-band photometry of ∼420,000 galaxies in the COSMOS202…
View article: pop-cosmos: Galaxy property and redshift catalog for COSMOS2020
pop-cosmos: Galaxy property and redshift catalog for COSMOS2020 Open
This record (v≥2.0.0) contains data products associated with the paper "pop-cosmos: Insights from generative modeling of a deep, infrared-selected galaxy population" by Thorp et al. (2025). Earlier versions of this record (v<2.0.0) contain…
View article: Cosmological feedback from a halo assembly perspective
Cosmological feedback from a halo assembly perspective Open
The impact of feedback from galaxy formation on cosmological probes is typically quantified in terms of the suppression of the matter power spectrum in hydrodynamical compared to gravity-only simulations. In this paper, we instead study ho…
View article: Bubbles in a box: Eliminating edge nucleation in cold-atom simulators of vacuum decay
Bubbles in a box: Eliminating edge nucleation in cold-atom simulators of vacuum decay Open
The decay of metastable false-vacuum states via bubble nucleation plays a crucial role in many cosmological scenarios. Cold-atom analog experiments will soon provide the first empirical probes of this process, with potentially far-reaching…
View article: GraphSense: Graph Embedding Based Code Suggestion Framework
GraphSense: Graph Embedding Based Code Suggestion Framework Open
Code suggestions have become an integral part of IDEs and developers use code suggestions generated by IDEs all the time. These code suggestions are mostly for calling a method of an object or for using a function of a library and not for …
View article: Data-space Validation of High-dimensional Models by Comparing Sample Quantiles
Data-space Validation of High-dimensional Models by Comparing Sample Quantiles Open
We present a simple method for assessing the predictive performance of high-dimensional models directly in data space when only samples are available. Our approach is to compare the quantiles of observables predicted by a model to those of…
View article: pop-cosmos: Scaleable Inference of Galaxy Properties and Redshifts with a Data-driven Population Model
pop-cosmos: Scaleable Inference of Galaxy Properties and Redshifts with a Data-driven Population Model Open
We present an efficient Bayesian method for estimating individual photometric redshifts and galaxy properties under a pretrained population model ( pop-cosmos ) that was calibrated using purely photometric data. This model specifies a prio…
View article: Generalized cold-atom simulators for vacuum decay
Generalized cold-atom simulators for vacuum decay Open
Cold-atom analog experiments are a promising new tool for studying relativistic vacuum decay, enabling one to empirically probe early-Universe theories in the laboratory. However, existing proposals place stringent requirements on the atom…
View article: pop-cosmos: Galaxy property and redshift catalog for COSMOS2020
pop-cosmos: Galaxy property and redshift catalog for COSMOS2020 Open
This record contains data products associated with the paper "pop-cosmos: Scaleable inference of galaxy properties and redshifts with a data-driven population model" by Thorp et al. (2024). The included products are derived from spectral e…
View article: pop-cosmos: A Comprehensive Picture of the Galaxy Population from COSMOS Data
pop-cosmos: A Comprehensive Picture of the Galaxy Population from COSMOS Data Open
We present pop-cosmos : a comprehensive model characterizing the galaxy population, calibrated to 140,938 ( r < 25 selected) galaxies from the Cosmic Evolution Survey (COSMOS) with photometry in 26 bands from the ultraviolet to the infrare…
View article: Deep learning insights into non-universality in the halo mass function
Deep learning insights into non-universality in the halo mass function Open
The abundance of dark matter haloes is a key cosmological probe in forthcoming galaxy surveys. The theoretical understanding of the halo mass function (HMF) is limited by our incomplete knowledge of the origin of non-universality and its c…
View article: Detecting strongly lensed type Ia supernovae with LSST
Detecting strongly lensed type Ia supernovae with LSST Open
Strongly lensed supernovae are rare and valuable probes of cosmology and astrophysics. Upcoming wide-field time-domain surveys, such as the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST), are expected to discover an ord…
View article: An antihalo void catalogue of the Local Super-Volume
An antihalo void catalogue of the Local Super-Volume Open
We construct an antihalo void catalogue of 150 voids with radii $R \gt 10\, h^{-1}\mathrm{\, Mpc}$ in the Local Super-Volume ($\lt 135\, h^{-1}\mathrm{\, Mpc}$ from the Milky Way), using posterior resimulation of initial conditions inferre…
View article: An antihalo void catalogue of the Local Super-Volume
An antihalo void catalogue of the Local Super-Volume Open
We construct an antihalo void catalogue of 150 voids with radii $R \gt 10\, h^{-1}\mathrm{\, Mpc}$ in the Local Super-Volume ($\lt 135\, h^{-1}\mathrm{\, Mpc}$ from the Milky Way), using posterior resimulation of initial conditions inferre…
View article: Deep learning insights into cosmological structure formation
Deep learning insights into cosmological structure formation Open
The evolution of linear initial conditions present in the early Universe into extended halos of dark matter at late times can be computed using cosmological simulations. However, a theoretical understanding of this complex process remains …
View article: Data-Space Validation of High-Dimensional Models by Comparing Sample Quantiles
Data-Space Validation of High-Dimensional Models by Comparing Sample Quantiles Open
We present a simple method for assessing the predictive performance of high-dimensional models directly in data space when only samples are available. Our approach is to compare the quantiles of observables predicted by a model to those of…
View article: pop-cosmos: A comprehensive picture of the galaxy population from COSMOS data
pop-cosmos: A comprehensive picture of the galaxy population from COSMOS data Open
We present pop-cosmos: a comprehensive model characterizing the galaxy population, calibrated to $140,938$ ($r<25$ selected) galaxies from the Cosmic Evolution Survey (COSMOS) with photometry in $26$ bands from the ultra-violet to the infr…
View article: Explaining Dark Matter Halo Density Profiles with Neural Networks
Explaining Dark Matter Halo Density Profiles with Neural Networks Open
We use explainable neural networks to connect the evolutionary history of dark matter halos with their density profiles. The network captures independent factors of variation in the density profiles within a low-dimensional representation,…
View article: Analog vacuum decay from vacuum initial conditions
Analog vacuum decay from vacuum initial conditions Open
Ultracold atomic gases can undergo phase transitions that mimic relativistic vacuum decay, allowing us to empirically test early Universe physics in tabletop experiments. We investigate the physics of these analog systems, going beyond pre…
View article: Detecting strongly-lensed type Ia supernovae with LSST
Detecting strongly-lensed type Ia supernovae with LSST Open
Strongly-lensed supernovae are rare and valuable probes of cosmology and astrophysics. Upcoming wide-field time-domain surveys, such as the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST), are expected to discover an ord…
View article: An Anti-halo Void Catalogue of the Local Super-Volume
An Anti-halo Void Catalogue of the Local Super-Volume Open
<p>Data from the construction of an anti-halo void catalogue of the Local Super-Volume. This upload contains the full anti-halo catalogue (also included in the associated publication) as well as the individual anti-halo catalogues fo…
View article: Measuring the nuclear equation of state with neutron star-black hole mergers
Measuring the nuclear equation of state with neutron star-black hole mergers Open
Gravitational-wave (GW) observations of neutron star-black hole (NSBH) mergers are sensitive to the nuclear equation of state (EOS). We present a new methodology for EOS inference with non-parametric Gaussian process (GP) priors, enabling …
View article: Generalized cold-atom simulators for vacuum decay
Generalized cold-atom simulators for vacuum decay Open
Cold-atom analog experiments are a promising new tool for studying relativistic vacuum decay, enabling one to empirically probe early-Universe theories in the laboratory. However, existing proposals place stringent requirements on the atom…
View article: Towards accurate field-level inference of massive cosmic structures
Towards accurate field-level inference of massive cosmic structures Open
We investigate the accuracy requirements for field-level inference of cluster and void masses using data from galaxy surveys. We introduce a two-step framework that takes advantage of the fact that cluster masses are determined by flows on…
View article: Results of the Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC)
Results of the Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC) Open
Next-generation surveys like the Legacy Survey of Space and Time (LSST) on the Vera C. Rubin Observatory (Rubin) will generate orders of magnitude more discoveries of transients and variable stars than previous surveys. To prepare for this…
View article: Analog vacuum decay from vacuum initial conditions
Analog vacuum decay from vacuum initial conditions Open
Ultracold atomic gases can undergo phase transitions that mimic relativistic vacuum decay, allowing us to empirically test early-Universe physics in tabletop experiments. We investigate the physics of these analog systems, going beyond pre…
View article: Explaining dark matter halo density profiles with neural networks
Explaining dark matter halo density profiles with neural networks Open
We use explainable neural networks to connect the evolutionary history of dark matter halos with their density profiles. The network captures independent factors of variation in the density profiles within a low-dimensional representation,…
View article: Towards Accurate Field-Level Inference of Massive Cosmic Structures
Towards Accurate Field-Level Inference of Massive Cosmic Structures Open
We investigate the accuracy requirements for field-level inference of cluster and void masses using data from galaxy surveys. We introduce a two-step framework that takes advantage of the fact that cluster masses are determined by flows on…
View article: Mass renormalization in lattice simulations of false vacuum decay
Mass renormalization in lattice simulations of false vacuum decay Open
False vacuum decay, a quantum mechanical first-order phase transition in scalar field theories, is an important phenomenon in early universe cosmology. Recently, real-time semi-classical techniques based on ensembles of lattice simulations…