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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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44 papers · 2 filters
Fast and robust Bayesian Inference using Gaussian Processes with GPry
Jonas El Gammal, Nils Schöneberg, Jesús Torrado +1
We present the GPry algorithm for fast Bayesian inference of general (non-Gaussian) posteriors with a moderate number of parameters. GPry does not need any pre-training, special ha…
-attractor inflation: Models and predictions
Sukannya Bhattacharya, Koushik Dutta, Mayukh R. Gangopadhyay +1
The -attractor models are some of the most interesting models of inflation from the point of view of upcoming observations in cosmology and also attractive from the point of vie…
Anisotropic correlation functions as tracers of central galaxy alignments in simulations
Facundo Rodriguez, Manuel Merchán, M. Celeste Artale +1
Motivated by observational results, we use IllustrisTNG hydrodynamical numerical simulations to study the alignment of the central galaxies in groups with the surrounding structure…
DEMNUni: disentangling dark energy from massive neutrinos with the void size function
Giovanni Verza, Carmelita Carbone, Alice Pisani +1
Cosmic voids, the underdense regions in the Universe, are impacted by dark energy and massive neutrinos. In this work, relying on the DEMNUni suite of cosmological simulations, we…
Euclid: performance on main cosmological parameter science
Isaac Tutusaus, Jenny G. Sorce, Antonino Troja
Euclid will observe 15 000 deg of the darkest sky, in regions free of contamination by light from our Galaxy and our Solar System. Three "Euclid Deep Fields" surveys covering a…
Cosmic decoherence: primordial power spectra and non-Gaussianities
Aoumeur Daddi Hammou, Nicola Bartolo
We study the effect of quantum decoherence on the inflationary cosmological perturbations. This process might imprint specific observational signatures revealing the quantum nature…
Quijote-PNG: Quasi-maximum likelihood estimation of Primordial Non-Gaussianity in the non-linear halo density field
Gabriel Jung, Dionysios Karagiannis, Michele Liguori +6
We study primordial non-Gaussian signatures in the redshift-space halo field on non-linear scales, using a quasi-maximum likelihood estimator based on optimally compressed power sp…
Probing Axions through Tomography of Anisotropic Cosmic Birefringence
Alessandro Greco, Nicola Bartolo, Alessandro Gruppuso
Cosmic birefringence is the in-vacuo rotation of the linear polarization plane experienced by photons of the Cosmic Microwave Background (CMB) radiation when theoretically well-mot…
Did JWST observe imprints of axion miniclusters or primordial black holes?
Gert Hütsi, Martti Raidal, Juan Urrutia +2
The James Webb Space Telescope has detected surprisingly luminous early galaxies that indicate a tension with the CDM. Motivated by scenarios including axion miniclusters or pri…
The effect of outflows on CMB bounds from Primordial Black Hole accretion
Lorenzo Piga, Matteo Lucca, Nicola Bellomo +4
Should Primordial Black Holes (PBHs) exist in nature, they would inevitably accrete baryonic matter in their vicinity. In turn, the consequent emission of high-energy radiation cou…
Microlensing of gravitational waves by dark matter structures
Malcolm Fairbairn, Juan Urrutia, Ville Vaskonen
Gravitational lensing of gravitational waves provides a potential new probe of dark matter structures. In this work, we consider the microlensing effect on gravitational wave signa…
Promise of Future Searches for Cosmic Topology
Yashar Akrami, Stefano Anselmi, Craig J. Copi +12
The shortest distance around the Universe through us is unlikely to be much larger than the horizon diameter if microwave background anomalies are due to cosmic topology. We show t…
Instability in axion inflation with strong backreaction from gauge modes
Marco Peloso, Lorenzo Sorbo
We perform an analytical study of the stability of the background solution of the model in which an inflaton, through an axionic coupling to a gauge field, causes an amplifi…
Efficient computation of the super-sample covariance for stage IV galaxy surveys
Fabien Lacasa, Marie Aubert, Philippe Baratta +6
Super-sample covariance (SSC) is an important effect for cosmological analyses that use the deep structure of the cosmic web; it may, however, be nontrivial to include it practical…
Statistical effects of the observer's peculiar velocity on source number counts
Charles Dalang, Ruth Durrer, Fabien Lacasa
The velocity of the Sun with respect to the cosmic microwave background (CMB) can be extracted from the CMB dipole, provided its intrinsic dipole is assumed to be small in comparis…
An Analytical Study of the Primordial Gravitational-Wave-Induced Contribution to the Large-Scale Structure of the Universe
Pritha Bari, Daniele Bertacca, Nicola Bartolo +3
The imprint of gravitational waves (GWs) on large-scale structures (LSS) is a useful and promising way to detect or to constrain them. Tensor fossils have been largely studied in t…
Euclid: Calibrating photometric redshifts with spectroscopic cross-correlations
K. Naidoo, H. Johnston, B. Joachimi +126
Cosmological constraints from key probes of the Euclid imaging survey rely critically on the accurate determination of the true redshift distributions, , of tomographic redsh…
Unveiling cosmological information on small scales with line intensity mapping
Sarah Libanore, Caner Unal, Debanjan Sarkar +1
One of the toughest challenges in modern cosmology is to probe the small scales Mpc in the matter power spectrum and clustering. We show that such small scales…
Updated constraints on amplitude and tilt of the tensor primordial spectrum
Giacomo Galloni, Nicola Bartolo, Sabino Matarrese +3
We have taken a comprehensive approach to update the limits on the tensor-to-scalar ratio () and the tensor spectral index (), using 10 datasets from the BICEP/Keck Array 2…
The Physical Content of Long Tensor Modes in Cosmology
Nicola Bartolo, Giovanni Battista Carollo, Sabino Matarrese +2
We analyze the physical content of squeezed bispectra involving long-wavelength tensor perturbations, showing that these modes cannot be gauged away, except for the exact (unphysic…
What is flat ΛCDM, and may we choose it?
Stefano Anselmi, Matthew F. Carney, John T. Giblin +5
The Universe is neither homogeneous nor isotropic, but it is close enough that we can reasonably approximate it as such on suitably large scales. The inflationary--Cold Dark Mat…
Galaxy number-count dipole and superhorizon fluctuations
Guillem Domènech, Roya Mohayaee, Subodh P. Patil +1
In view of the growing tension between the dipole anisotropy of number counts of cosmologically distant sources and of the cosmic microwave background (CMB), we investigate the num…
Euclid: Testing the Copernican principle with next-generation surveys
D. Camarena, V. Marra, Z. Sakr +112
The Copernican principle, the notion that we are not at a special location in the Universe, is one of the cornerstones of modern cosmology and its violation would invalidate the Fr…
The halo bias inside cosmic voids
Giovanni Verza, Carmelita Carbone, Alessandro Renzi
The bias of dark matter halos and galaxies is a crucial quantity in many cosmological analyses. In this work, using large cosmological simulations, we explore the halo mass functio…