Cullen H. Blake
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View article: The c = -2 Foundation of Constraint Geometry Deriving the Cosmic Budget from Logarithmic Conformal Field Theory
The c = -2 Foundation of Constraint Geometry Deriving the Cosmic Budget from Logarithmic Conformal Field Theory Open
We establish that the Constraint Geometry Framework (CGF) admits a precise mathematical realization as a c = -2 Logarithmic Conformal Field Theory (LCFT) embedded in three-dimensional sphere packing geometry. This identification is not phe…
View article: The role of peculiar velocity uncertainties in standard siren cosmology
The role of peculiar velocity uncertainties in standard siren cosmology Open
Local distance indicators such as standard sirens, in combination with spectroscopic redshift measurements of their host galaxies, allow us to estimate the present-day expansion rate of the Universe parameterised by Hubble’s constant, H_0.…
View article: Detection of supernova magnitude fluctuations induced by large-scale structure
Detection of supernova magnitude fluctuations induced by large-scale structure Open
The peculiar velocities of supernovae and their host galaxies are correlated with the large-scale structure of the Universe, and can be used to constrain the growth rate of structure and test the cosmological model. In this work, we measur…
View article: Validation of the DESI-DR1 3x2-pt analysis: scale cut and shear ratio tests
Validation of the DESI-DR1 3x2-pt analysis: scale cut and shear ratio tests Open
Combined survey analyses of galaxy clustering and weak gravitational lensing (3x2-pt studies) will allow new and accurate tests of the standard cosmological model. However, careful validation is necessary to ensure that these cosmological …
View article: Testing gravitational physics by combining DESI DR1 and weak lensing datasets using the E_G estimator
Testing gravitational physics by combining DESI DR1 and weak lensing datasets using the E_G estimator Open
The action of gravitational physics across space-time creates observable signatures in the behaviour of light and matter. We perform combined-probe studies using data from the Baryon Oscillation Spectroscopic Survey (BOSS) and Dark Energy …
View article: DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars
DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars Open
We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1 divided into six redshift bins over a ∼ 7,500 square degree f…
View article: Intrinsic alignment demographics for next-generation lensing: Revealing galaxy property trends with DESI Y1 direct measurements
Intrinsic alignment demographics for next-generation lensing: Revealing galaxy property trends with DESI Y1 direct measurements Open
We present direct measurements of the intrinsic alignments (IA) of over 2 million spectroscopic galaxies using DESI Data Release 1 and imaging from four lensing surveys: DES, HSC, KiDS, and SDSS. In this uniquely data-rich regime, we take …
View article: An Earth-Sized Planet in a 5.4h Orbit Around a Nearby K dwarf
An Earth-Sized Planet in a 5.4h Orbit Around a Nearby K dwarf Open
We present the discovery and confirmation of the ultra-short period (USP) planet TOI-2431 b orbiting a nearby ($d\sim36$ pc) late K star ($T_{\mathrm{eff}}$ = $4109 \pm 28 \, {\rm K}$) using observations from the Transiting Exoplanet Surve…
View article: TOI-1259Ab: A Warm Jupiter Orbiting a K-dwarf White-Dwarf Binary is on a Well-aligned Orbit
TOI-1259Ab: A Warm Jupiter Orbiting a K-dwarf White-Dwarf Binary is on a Well-aligned Orbit Open
The evolution of one member of a stellar binary into a white dwarf has been proposed as a mechanism that triggers the formation of close-in gas giant planets. The star's asymmetric mass loss during the AGB stage gives it a "kick" that can …
View article: DESI 2024 VII: cosmological constraints from the full-shape modeling of clustering measurements
DESI 2024 VII: cosmological constraints from the full-shape modeling of clustering measurements Open
We present cosmological results from the measurement of clustering of galaxy, quasar and Lyman-α forest tracers from the first year of observations with the Dark Energy Spectroscopic Instrument (DESI Data Release 1). We adopt the full-shap…
View article: Lensing Without Borders: Measurements of galaxy-galaxy lensing and projected galaxy clustering in DESI DR1
Lensing Without Borders: Measurements of galaxy-galaxy lensing and projected galaxy clustering in DESI DR1 Open
We present Galaxy-Galaxy Lensing measurements obtained by cross-correlating spectroscopically observed galaxies from the first data release of the Dark Energy Spectroscopic Instrument (DESI) with source galaxies from the Hyper Suprime-Cam …
View article: DESI DR2 results. II. Measurements of baryon acoustic oscillations and cosmological constraints
DESI DR2 results. II. Measurements of baryon acoustic oscillations and cosmological constraints Open
We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology infe…
View article: DESI 2024 III: baryon acoustic oscillations from galaxies and quasars
DESI 2024 III: baryon acoustic oscillations from galaxies and quasars Open
We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1. Divided by tracer type, we utilize 300,017 galaxies from the m…
View article: DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest
DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest Open
We present the Baryon Acoustic Oscillation (BAO) measurements with the Lyman-alpha (LyA) forest from the second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI) survey. Our BAO measurements include both the auto-correl…
View article: Data Release 1 of the Dark Energy Spectroscopic Instrument
Data Release 1 of the Dark Energy Spectroscopic Instrument Open
In 2021 May the Dark Energy Spectroscopic Instrument (DESI) collaboration began a 5-year spectroscopic redshift survey to produce a detailed map of the evolving three-dimensional structure of the universe between $z=0$ and $z\approx4$. DES…
View article: The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics
The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics Open
The current generation of large galaxy surveys will test the cosmological model by combining multiple types of observational probes. Realising the statistical promise of these new datasets requires rigorous attention to all aspects of anal…
View article: DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations
DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations Open
We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman- α forest tracers from the first year of observations from the Dark Energy Spectroscopic Instrument (DESI), to be releas…
View article: DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest
DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest Open
We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman- α (Ly α ) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Ly α …
View article: The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics
The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics Open
The current generation of large galaxy surveys will test the cosmological model by combining multiple types of observational probes. Realising the statistical promise of these new datasets requires rigorous attention to all aspects of anal…
View article: DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars Open
We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range $0.1
View article: Cosmology with shear ratios: a joint study of weak lensing and spectroscopic redshift datasets
Cosmology with shear ratios: a joint study of weak lensing and spectroscopic redshift datasets Open
The ratio of the average tangential shear signal of different weak lensing source populations around the same lens galaxies, also known as a shear ratio, provides an important test of lensing systematics and a potential source of cosmologi…
View article: Forecasting the accuracy of velocity-field reconstruction
Forecasting the accuracy of velocity-field reconstruction Open
Joint analyses of the large-scale distribution of galaxies, and their motions under the gravitational influence of this density field, allow powerful tests of the cosmological model, including measurement of the growth rate of cosmic struc…
View article: Gaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars
Gaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars Open
Gaia astrometry of nearby stars is precise enough to detect the tiny displacements induced by substellar companions, but radial velocity data are needed for definitive confirmation. Here we present radial velocity follow-up observations of…
View article: Searching for GEMS: TOI-5688 A b, a low-density giant orbiting a high-metallicity early M-dwarf
Searching for GEMS: TOI-5688 A b, a low-density giant orbiting a high-metallicity early M-dwarf Open
We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets ($R \gtrsim8$ M${}_\oplus$) through the Searching f…
View article: Forecasting the accuracy of velocity-field reconstruction
Forecasting the accuracy of velocity-field reconstruction Open
Joint analyses of the large-scale distribution of galaxies, and their motions under the gravitational influence of this density field, allow powerful tests of the cosmological model, including measurement of the growth rate of cosmic struc…
View article: Constraining modified gravity scenarios with the 6dFGS and SDSS galaxy peculiar velocity data sets
Constraining modified gravity scenarios with the 6dFGS and SDSS galaxy peculiar velocity data sets Open
The detailed nature of dark energy remains a mystery, leaving the possibility that its effects might be explained by changes to the laws of gravity on large scales. The peculiar velocities of galaxies directly trace the strength of gravity…
View article: Redshift evolution and covariances for joint lensing and clustering studies with DESI Y1
Redshift evolution and covariances for joint lensing and clustering studies with DESI Y1 Open
Galaxy–galaxy lensing (GGL) and clustering measurements from the Dark Energy Spectroscopic Instrument Year 1 (DESI Y1) data set promise to yield unprecedented combined-probe tests of cosmology and the galaxy–halo connection. In such analys…
View article: Systematic Effects in Galaxy-Galaxy Lensing with DESI
Systematic Effects in Galaxy-Galaxy Lensing with DESI Open
The Dark Energy Spectroscopic Instrument (DESI) survey will measure spectroscopic redshifts for millions of galaxies across roughly of the sky. Cross-correlating targets in the DESI survey with complementary imaging surveys allo…
View article: The Early Data Release of the Dark Energy Spectroscopic Instrument
The Early Data Release of the Dark Energy Spectroscopic Instrument Open
The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This pape…
View article: Not all lensing is low: An analysis of DESI$\times$DES using the Lagrangian Effective Theory of LSS
Not all lensing is low: An analysis of DESI$\times$DES using the Lagrangian Effective Theory of LSS Open
In this work we use Lagrangian perturbation theory to analyze the harmonic space galaxy clustering signal of Bright Galaxy Survey (BGS) and Luminous Red Galaxies (LRGs) targeted by the Dark Energy Spectroscopic Instrument (DESI), combined …