Gustavo Niz
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View article: Modelling the impact of quasar redshift errors on the full-shape analysis of correlations in the Lyman-α forest
Modelling the impact of quasar redshift errors on the full-shape analysis of correlations in the Lyman-α forest Open
In preparation for the first cosmological measurements from the full shape of the Lyman-$\alpha$ (Ly $\alpha$) forest from Dark Energy Spectroscopic Instrument (DESI), we must carefully model all relevant systematics that might bias our an…
View article: Enhancing DESI DR1 full-shape analyses using HOD-informed priors
Enhancing DESI DR1 full-shape analyses using HOD-informed priors Open
We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based on cosmological perturbation theory (PT). By leveraging phys…
View article: DESI DR1 Ly <i>α</i> 1D power spectrum: the Fast Fourier Transform estimator measurement
DESI DR1 Ly <i>α</i> 1D power spectrum: the Fast Fourier Transform estimator measurement Open
We present the one-dimensional Lyman- α forest power spectrum measurement derived from the data release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). The measurement of the Lyman- α forest power spectrum along the line of sig…
View article: Cosmology from Planck CMB lensing and DESI DR1 quasar tomography
Cosmology from Planck CMB lensing and DESI DR1 quasar tomography Open
We present a measurement of the amplitude of matter fluctuations over the redshift range 0.8 ≤ z ≤ 3.5 from the cross correlation of over 1.2 million spectroscopic quasars selected by the Dark Energy Spectroscopic Instrument (DESI) across …
View article: DESI DR1 Lyα 1D power spectrum: the optimal estimator measurement
DESI DR1 Lyα 1D power spectrum: the optimal estimator measurement Open
The one-dimensional power spectrum P 1D of Lyα forest offers rich insights into cosmological and astrophysical parameters, including constraints on the sum of neutrino masses, warm dark matter models, and the thermal state of the intergala…
View article: Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO
Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO Open
Supplementary material to DESI's publication 'Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO' to comply with the data management plan.
View article: DESI DR1 Ly$α$ forest: 3D full-shape analysis and cosmological constraints
DESI DR1 Ly$α$ forest: 3D full-shape analysis and cosmological constraints Open
We perform an analysis of the full shapes of Lyman-$α$ (Ly$α$) forest correlation functions measured from the first data release (DR1) of the Dark Energy Spectroscopic Instrument (DESI). Our analysis focuses on measuring the Alcock-Paczyns…
View article: Modified gravity constraints from the full shape modeling of clustering measurements from DESI 2024
Modified gravity constraints from the full shape modeling of clustering measurements from DESI 2024 Open
We present cosmological constraints on deviations from general relativity (GR) from the first-year of clustering observations from the Dark Energy Spectroscopic Instrument (DESI) in combination with other available datasets including the C…
View article: Frequentist Cosmological Constraints from Full-Shape Clustering Measurements in DESI DR1
Frequentist Cosmological Constraints from Full-Shape Clustering Measurements in DESI DR1 Open
We perform a frequentist analysis using the standard profile likelihood method for clustering measurements from Data Release 1 of the Dark Energy Spectroscopic Instrument (DESI). While Bayesian inferences for Effective Field Theory models …
View article: Study of the Connected Four-Point Correlation Function of Galaxies from DESI Data Release 1 Luminous Red Galaxy Sample
Study of the Connected Four-Point Correlation Function of Galaxies from DESI Data Release 1 Luminous Red Galaxy Sample Open
We present a measurement of the non-Gaussian four-point correlation function (4PCF) from the DESI DR1 Luminous Red Galaxy (LRG) sample. For the gravitationally induced parity-even 4PCF, we detect a signal with a significance of 14.7$σ$ usi…
View article: Constraints on neutrino physics from DESI DR2 BAO and DR1 full shape
Constraints on neutrino physics from DESI DR2 BAO and DR1 full shape Open
The Dark Energy Spectroscopic Instrument (DESI) Collaboration has obtained robust measurements of baryon acoustic oscillations in the redshift range 0.1 < z < 4.2 , based on the Lyman- α forest and galaxies from data release 2. We comb…
View article: Measurements of the thermal Sunyaev-Zel’dovich effect with ACT and DESI luminous red galaxies
Measurements of the thermal Sunyaev-Zel’dovich effect with ACT and DESI luminous red galaxies Open
International audience
View article: Cosmological neutrino mass: a frequentist overview in light of DESI
Cosmological neutrino mass: a frequentist overview in light of DESI Open
We derive constraints on the neutrino mass using a variety of recent cosmological datasets, including DESI BAO, the full-shape analysis of the DESI matter power spectrum and the one-dimensional power spectrum of the Lyman-$α$ forest (P1D) …
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: Stellar reddening map from DESI imaging and spectroscopy
Stellar reddening map from DESI imaging and spectroscopy Open
We present new Galactic reddening maps of the high Galactic latitude sky using DESI imaging and spectroscopy. We directly measure the reddening of 2.6 million stars by comparing the observed stellar colors in and from DESI imaging with t…
View article: Stellar reddening map from DESI imaging and spectroscopy
Stellar reddening map from DESI imaging and spectroscopy Open
We present new Galactic reddening maps of the high Galactic latitude sky using DESI imaging and spectroscopy. We directly measure the reddening of 2.6 million stars by comparing the observed stellar colors in and from DESI imagin…
View article: Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data
Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data Open
We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and …
View article: Reconstructing Quasar Spectra and Measuring the Ly$α$ Forest with ${\rm S{\scriptsize pender}Q}$
Reconstructing Quasar Spectra and Measuring the Ly$α$ Forest with ${\rm S{\scriptsize pender}Q}$ Open
Quasar spectra carry the imprint of foreground intergalactic medium (IGM) through absorption features. In particular, absorption caused by neutral hydrogen gas, the ``Ly$α$ forest,'' is a key spectroscopic tracer for cosmological analyses …
View article: Positive Neutrino Masses with DESI DR2 via Matter Conversion to Dark Energy
Positive Neutrino Masses with DESI DR2 via Matter Conversion to Dark Energy Open
The Dark Energy Spectroscopic Instrument (DESI) is a massively parallel spectroscopic survey on the Mayall telescope at Kitt Peak, which has released measurements of baryon acoustic oscillations determined from over 14 million extragalacti…
View article: Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6
Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6 Open
We infer the growth of large scale structure over the redshift range 0.4 ≲ z ≲ 1 from the cross-correlation of spectroscopically calibrated Luminous Red Galaxies (LRGs) selected from the Dark Energy Spectroscopic Instrument (DESI) legacy i…
View article: Window convolution of the galaxy clustering bispectrum
Window convolution of the galaxy clustering bispectrum Open
In galaxy survey analysis, the observed clustering statistics do not directly match theoretical predictions but rather have been processed by a window function that arises from the survey geometry including the sky footprint, redshift-depe…
View article: Constraining primordial non-Gaussianity with DESI 2024 LRG and QSO samples
Constraining primordial non-Gaussianity with DESI 2024 LRG and QSO samples Open
We analyse the large-scale clustering of the Luminous Red Galaxy (LRG) and Quasar (QSO) sample from the first data release (DR1) of the Dark Energy Spectroscopic Instrument (DESI). In particular, we constrain the primordial non-Gaussianity…
View article: First Ly-<i>α</i> 1D bispectrum measurement in eBOSS
First Ly-<i>α</i> 1D bispectrum measurement in eBOSS Open
We present the first robust measurement of the one-dimensional Lyman alpha (Ly- α ) forest bispectrum using the complete extended Baryon Oscillation Spectroscopic Survey (eBOSS) quasar sample, corresponding to the sixteenth data release (D…
View article: Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples
Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples Open
We present the first joint analysis of the power spectrum and bispectrum using the Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI), focusing on Luminous Red Galaxies (LRGs) and quasars (QSOs) across a redshift range…
View article: Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6
Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6 Open
We infer the growth of large scale structure over the redshift range 0.4 ≲ z ≲ 1 from the cross-correlation of spectroscopically calibrated Luminous Red Galaxies (LRGs) selected from the Dark Energy Spectroscopic Instrument (DESI) legacy i…
View article: Constraints on primordial non-Gaussianity from the cross-correlation of DESI luminous red galaxies and <i>Planck</i> CMB lensing
Constraints on primordial non-Gaussianity from the cross-correlation of DESI luminous red galaxies and <i>Planck</i> CMB lensing Open
Aims. We use the angular cross-correlation between a luminous red galaxy (LRG) sample from the Dark Energy Spectroscopic Instrument (DESI) Legacy Survey data release DR9 and the Planck cosmic microwave background (CMB) lensing maps to cons…
View article: Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI legacy imaging galaxies and CMB lensing from ACT DR6 and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi><mml:mi>l</mml:mi><mml:mi>a</mml:mi><mml:mi>n</mml:mi><mml:mi>c</mml:mi><mml:mi>k</mml:mi></mml:math> PR4
Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI legacy imaging galaxies and CMB lensing from ACT DR6 and PR4 Open
We measure the growth of cosmic density fluctuations on large scales and across the redshift range 0.3<z<0.8 through galaxy clustering and the cross-correlation of the ACT data release 6 cosmic microwave background (CMB) lensing map and ga…
View article: Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data
Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data Open
We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and …
View article: Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT
Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT Open
The gas density profile around galaxies, shaped by feedback and affecting the galaxy lensing signal, is imprinted on the cosmic microwave background (CMB) by the kinematic Sunyaev-Zel'dovich effect (kSZ). We precisely measure this effect (…
View article: Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies
Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies Open
Cosmic Microwave Background (CMB) photons scatter off the free-electron gas in galaxies and clusters, allowing us to use the CMB as a backlight to probe the gas in and around low-redshift galaxies. The thermal Sunyaev-Zel'dovich effect, so…