C. Danielle Leonard
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View article: Principal components for model-agnostic modified gravity with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>3</mml:mn><mml:mo>×</mml:mo><mml:mn>2</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>pt</mml:mi></mml:mrow></mml:math> data
Principal components for model-agnostic modified gravity with data Open
To mitigate the severe information loss arising from widely adopted linear scale cuts in constraints on modified gravity parametrizations with weak lensing (WL) and large-scale structure (LSS) data, we introduce a novel alternative method …
View article: Taking the Weight Off: Mitigating Parameter Bias from Catastrophic Outliers in 3$\times$2pt Analysis
Taking the Weight Off: Mitigating Parameter Bias from Catastrophic Outliers in 3$\times$2pt Analysis Open
Stage IV cosmological surveys will map the universe with unprecedented precision, reducing statistical uncertainties to levels where unmodelled systematics can significantly bias inference. In particular, photometric redshift (photo-z) err…
View article: Forecasting the Impact of Source Galaxy Photometric Redshift Uncertainties on the LSST $3\times2$pt Analysis
Forecasting the Impact of Source Galaxy Photometric Redshift Uncertainties on the LSST $3\times2$pt Analysis Open
Photometric redshifts of the source galaxies are a key source of systematic uncertainty in the Rubin Observatory Legacy Survey of Space and Time (LSST)'s galaxy clustering and weak lensing analysis, i.e., the $3\times 2$pt analysis. This p…
View article: Meta-learning for cosmological emulation: Rapid adaptation to new lensing kernels
Meta-learning for cosmological emulation: Rapid adaptation to new lensing kernels Open
Theoretical computation of cosmological observables is an intensive process, restricting the speed at which cosmological data can be analysed and cosmological models constrained, and therefore limiting research access to those with high pe…
View article: Principal Components for Model-Agnostic Modified Gravity with 3x2pt
Principal Components for Model-Agnostic Modified Gravity with 3x2pt Open
To mitigate the severe information loss arising from widely adopted linear scale cuts in constraints on modified gravity parameterisations with Weak Lensing (WL) and Large-Scale Structure (LSS) data, we introduce a novel alternative method…
View article: Joint modelling of astrophysical systematics for cosmology with LSST cosmic shear
Joint modelling of astrophysical systematics for cosmology with LSST cosmic shear Open
We present a novel framework for jointly modelling the weak lensing source galaxy redshift distribution and the intrinsic alignment (IA) of galaxies through a shared luminosity function (LF). In the context of a Rubin Observatory’s Legacy …
View article: Modelling and Mitigating the Systematics in Weak Lensing Measurements
Modelling and Mitigating the Systematics in Weak Lensing Measurements Open
Upcoming Stage IV surveys will significantly enhance the precision of weak lensing measurements but require better understanding and treatment of systematics contaminating the weak lensing signal.This thesis explores several approaches to …
View article: An Empirical Model For Intrinsic Alignments: Insights From Cosmological Simulations
An Empirical Model For Intrinsic Alignments: Insights From Cosmological Simulations Open
We extend current models of the halo occupation distribution (HOD) to include a flexible, empirical framework for the forward modeling of the intrinsic alignment (IA) of galaxies. A primary goal of this work is to produce mock galaxy catal…
View article: Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear
Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear Open
In the context of cosmological weak lensing studies, intrinsic alignments (IAs) are one of the most In the context of cosmological weak lensing studies, intrinsic alignments (IAs) are one of the most complicated astrophysical systematic to…
View article: Photometric redshifts and intrinsic alignments: Degeneracies and biases in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>3</mml:mn><mml:mo>×</mml:mo><mml:mn>2</mml:mn><mml:mi>pt</mml:mi></mml:math> analysis
Photometric redshifts and intrinsic alignments: Degeneracies and biases in the analysis Open
We present a systematic study of cosmological parameter bias in weak lensing and large-scale structure analyses for upcoming imaging surveys induced by the interplay of intrinsic alignments (IA) and photometric redshift (photo-z) model mis…
View article: Photometric redshifts and intrinsic alignments: degeneracies and biases in 3$\times$2pt analysis
Photometric redshifts and intrinsic alignments: degeneracies and biases in 3$\times$2pt analysis Open
We present a systematic study of cosmological parameter bias in weak lensing and large-scale structure analyses for upcoming imaging surveys induced by the interplay of intrinsic alignments (IA) and photometric redshift (photo-z) model mis…
View article: Intrinsic alignment from multiple shear estimates: a first application to data and forecasts for stage IV
Intrinsic alignment from multiple shear estimates: a first application to data and forecasts for stage IV Open
Without mitigation, the intrinsic alignment (IA) of galaxies poses a significant threat to achieving unbiased cosmological parameter constraints from precision weak lensing surveys. Here, we apply for the first time to data a method to ext…
View article: Cosmological constraints on 4-dimensional Einstein-Gauss-Bonnet gravity
Cosmological constraints on 4-dimensional Einstein-Gauss-Bonnet gravity Open
4-Dimensional Einstein-Gauss-Bonnet (4DEGB) gravity has garnered significant attention in the last few years as a phenomenological competitor to general relativity. We consider the theoretical and observational implications of this theory …
View article: Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear
Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear Open
In the context of cosmological weak lensing studies, intrinsic alignments (IAs) are one the most complicated astrophysical systematic to model, given the poor understanding of the physical processes that cause them. A number of modelling f…
View article: An Empirical Model For Intrinsic Alignments: Insights From Cosmological Simulations
An Empirical Model For Intrinsic Alignments: Insights From Cosmological Simulations Open
We extend current models of the halo occupation distribution (HOD) to include a flexible, empirical framework for the forward modeling of the intrinsic alignment (IA) of galaxies. A primary goal of this work is to produce mock galaxy catal…
View article: Cosmological Constraints on 4-Dimensional Einstein-Gauss-Bonnet Gravity
Cosmological Constraints on 4-Dimensional Einstein-Gauss-Bonnet Gravity Open
4-Dimensional Einstein-Gauss-Bonnet (4DEGB) gravity has garnered significant attention in the last few years as a phenomenological competitor to general relativity. We consider the theoretical and observational implications of this theory …
View article: Intrinsic alignment from multiple shear estimates: A first application to data and forecasts for Stage IV
Intrinsic alignment from multiple shear estimates: A first application to data and forecasts for Stage IV Open
Without mitigation, the intrinsic alignment (IA) of galaxies poses a significant threat to achieving unbiased cosmological parameter constraints from precision weak lensing surveys. Here, we apply for the first time to data a method to ext…
View article: Dark Energy Survey Year 3 results: Constraints on extensions to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>CDM</mml:mi></mml:math> with weak lensing and galaxy clustering
Dark Energy Survey Year 3 results: Constraints on extensions to with weak lensing and galaxy clustering Open
Here we constrain six possible extensions to the Λ cold dark matter (CDM) model using measurements from the Dark Energy Survey’s first three years of observations, alone and in combination with external cosmological probes. The DES data ar…
View article: The N5K Challenge: Non-Limber Integration for LSST Cosmology
The N5K Challenge: Non-Limber Integration for LSST Cosmology Open
The rapidly increasing statistical power of cosmological imaging surveys requires us to reassess the regime of validity for various approximations that accelerate the calculation of relevant theoretical predictions. In this paper, we prese…
View article: Probing gravity with the DES-CMASS sample and BOSS spectroscopy
Probing gravity with the DES-CMASS sample and BOSS spectroscopy Open
The DES-CMASS sample (DMASS) is designed to optimally combine the weak lensing measurements from the Dark Energy Survey (DES) and redshift-space distortions (RSD) probed by the CMASS galaxy sample from the Baryonic Oscillation Spectroscopi…
View article: Rubin-Euclid Derived Data Products – Initial Recommendations
Rubin-Euclid Derived Data Products – Initial Recommendations Open
This report is the result of a joint discussion between the Rubin and Euclid scientific communities. The work presented in this report was focused on designing and recommending an initial set of Derived Data products (DDPs) that could real…
View article: Probing gravity with the DES-CMASS sample and BOSS spectroscopy
Probing gravity with the DES-CMASS sample and BOSS spectroscopy Open
The DES-CMASS sample (DMASS) is designed to optimally combine the weak lensing measurements from the Dark Energy Survey (DES) and redshift-space distortions (RSD) probed by the CMASS galaxy sample from the Baryonic Oscillation Spectroscopi…
View article: Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data
Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data Open
We study a phenomenological class of models where dark matter converts to dark radiation in the low redshift epoch. This class of models, dubbed DMDR, characterizes the evolution of comoving dark-matter density with two extra parameters, a…
View article: DES Y1 results: Splitting growth and geometry to test <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>CDM</mml:mi></mml:math>
DES Y1 results: Splitting growth and geometry to test Open
We analyze Dark Energy Survey (DES) data to constrain a cosmological model where a subset of parameters—focusing on Ωm—are split into versions associated with structure growth (e.g., Ω$^{grow}_m$) and expansion history (e.g., Ω$…
View article: Fisher Matrix Stability
Fisher Matrix Stability Open
Fisher forecasts are a common tool in cosmology with applications ranging from survey planning to the development of new cosmological probes. While frequently adopted, they are subject to numerical instabilities that need to be carefully i…
View article: Constraints on decaying dark matter with DES-Y1 and external data
Constraints on decaying dark matter with DES-Y1 and external data Open
We study a class of decaying dark matter models as a possible resolution to the observed discrepancies between early- and late-time probes of the universe. This class of models, dubbed DDM, characterizes the evolution of comoving dark matt…
View article: Dark Energy Survey Year 1 results: constraints on intrinsic alignments and their colour dependence from galaxy clustering and weak lensing
Dark Energy Survey Year 1 results: constraints on intrinsic alignments and their colour dependence from galaxy clustering and weak lensing Open
We perform a joint analysis of intrinsic alignments and cosmology using tomographic weak lensing, galaxy clustering, and galaxy–galaxy lensing measurements from Year 1 (Y1) of the Dark Energy Survey. We define early- and late-type subsampl…
View article: Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing
Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing Open
We introduce constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by utilizing a combined analysis of galaxy clustering and weak gravitational lensing from the first…
View article: Modified Gravity and Dark Energy models Beyond $w(z)$CDM Testable by LSST
Modified Gravity and Dark Energy models Beyond $w(z)$CDM Testable by LSST Open
One of the main science goals of the Large Synoptic Survey Telescope (LSST) is to uncover the nature of cosmic acceleration. In the base analysis, possible deviations from the Lambda-Cold-Dark-Matter ($Λ$CDM) background evolution will be p…
View article: Modified Gravity and Dark Energy models Beyond $w(z)$CDM Testable by\n LSST
Modified Gravity and Dark Energy models Beyond $w(z)$CDM Testable by\n LSST Open
One of the main science goals of the Large Synoptic Survey Telescope (LSST)\nis to uncover the nature of cosmic acceleration. In the base analysis, possible\ndeviations from the Lambda-Cold-Dark-Matter ($\\Lambda$CDM) background evolution\…