Search Publications
The Lunar Gravitational-wave Antenna: mission studies and science case
Burrows, Adam; Mastrobuono-Battisti, Alessandra; Kobayashi, Chiaki +83 more
The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response of the Moon to gravitational waves (GWs). Given the size of the Moon and the expected noise produced by the lunar seismic background, the LGWA would be able to observe GWs from about 1 mHz to 1 Hz. This would make the LGWA th…
Mapping dark matter in the Milky Way using normalizing flows and Gaia DR3
Lim, Sung Hak; Buckley, Matthew R.; Shih, David +1 more
We present a novel, data-driven analysis of Galactic dynamics, using unsupervised machine learning — in the form of density estimation with normalizing flows — to learn the underlying phase space distribution of 6 million nearby stars from the Gaia DR3 catalog. Solving the equilibrium collisionless Boltzmann equation, we calculate — for the first …
Measuring σ 8 using DESI Legacy Imaging Surveys Emission-Line galaxies and Planck CMB lensing, and the impact of dust on parameter inference
Miquel, Ramon; Sanchez, Eusebio; Palanque-Delabrouille, Nathalie +39 more
Measuring the growth of structure is a powerful probe for studying the dark sector, especially in light of the σ 8 tension between primary CMB anisotropy and low-redshift surveys. This paper provides a new measurement of the amplitude of the matter power spectrum, σ 8, using galaxy-galaxy and galaxy-CMB lensing power spectra …
Forward modeling fluctuations in the DESI LRGs target sample using image simulations
Juneau, S.; Moustakas, J.; Brooks, D. +50 more
We use the forward modeling pipeline, Obiwan, to study the imaging systematics of the Luminous Red Galaxies (LRGs) targeted by the Dark Energy Spectroscopic Instrument (DESI). Imaging systematics refers to the false fluctuation of galaxy densities due to varying observing conditions and astrophysical foregrounds corresponding to the imaging survey…
Constraining primordial non-Gaussianity from DESI quasar targets and Planck CMB lensing
Miquel, Ramon; Font-Ribera, Andreu; Yèche, Christophe +33 more
We detect the cross-correlation between 2.7 million DESI quasar targets across 14,700 deg2 (180 quasars deg-2) and Planck 2018 CMB lensing at ∼30σ. We use the cross-correlation on very large scales to constrain local primordial non-Gaussianity via the scale dependence of quasar bias. The DESI quasar targets lie at an effectiv…
Dissecting the stochastic gravitational wave background with astrometry
Dai, Liang; Xue, Xiao; Çalışkan, Mesut +3 more
Astrometry, the precise measurement of star motions, offers an alternative avenue to investigate low-frequency gravitational waves through the spatial deflection of photons, complementing pulsar timing arrays reliant on timing residuals. Upcoming data from Gaia, Theia, and Roman can not only cross-check pulsar timing array findings but also explor…
Growth history and quasar bias evolution at z < 3 from Quaia
Alonso, David; Carron, Julien; Lewis, Antony +4 more
We make use of the Gaia-unWISE quasar catalogue, Quaia, to constrain the growth history out to high redshifts from the clustering of quasars and their cross-correlation with maps of the Cosmic Microwave Background (CMB) lensing convergence. Considering three tomographic bins, centred at redshifts z̅i = [0.69, 1.59, 2.72], we reconstruct …
Simulation-based inference of deep fields: galaxy population model and redshift distributions
Tortorelli, Luca; Refregier, Alexandre; Kacprzak, Tomasz +3 more
Accurate redshift calibration is required to obtain unbiased cosmological information from large-scale galaxy surveys. In a forward modelling approach, the redshift distribution n(z) of a galaxy sample is measured using a parametric galaxy population model constrained by observations. We use a model that captures the redshift evolution of the gala…
Hubble tension in a nonminimally coupled curvature-matter gravity model
Bertolami, Orfeu; Barroso Varela, Miguel
The presently open problem of the Hubble tension is shown to be removed in the context of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave background data until their values from direct late-time measurements, we obtain an agreement betwee…
Gamma rays from dark matter spikes in EAGLE simulations
Peletier, R. F.; Horns, D.; Moulin, E. +3 more
Intermediate Mass Black Holes (IMBHs) with a mass range between 100 M⊙ and 106 M⊙ are expected to be surrounded by high dark matter densities, so-called dark matter spikes. The high density of self-annihilating Weakly Interacting Massive Particles (WIMPs) in these spikes leads to copious gamma-ray production. Suffi…