Publications (203)
Constraint on neutrino masses from SDSS-III/BOSS Ly forest and other cosmological probes
Nathalie Palanque-Delabrouille, Christophe Yèche, Julien Lesgourgues +11
We present constraints on the parameters of the CDM cosmological model in the presence of massive neutrinos, using the one-dimensional Ly forest power spectrum obtained wit…
Constraining Primordial Non-Gaussianity with High-Redshift Probes
Jun-Qing Xia, Anna Bonaldi, Carlo Baccigalupi +4
We present an analysis of the constraints on the amplitude of primordial non-Gaussianity of local type described by the dimensionless parameter . These constraints are…
The Statistics of Cosmological Lyman-alpha Absorption
Dipak Munshi, Peter Coles, Matteo Viel
We study the effect of the non-Gaussianity induced by gravitational evolution upon the statistical properties of absorption in quasar (QSO) spectra. Using the generic hierarchical…
A decline and fall in the future of Italian Astronomy?
Angelo Antonelli, Vincenzo Antonuccio-Delogu, Andrea Baruffolo +89
On May 27th 2010, the Italian astronomical community learned with concern that the National Institute for Astrophysics (INAF) was going to be suppressed, and that its employees wer…
Non-perturbative results for the luminosity and area distances
Dimitar Ivanov, Stefano Liberati, Matteo Viel +1
The notion of luminosity distance is most often defined in purely FLRW (Friedmann-Lemaitre-Robertson-Walker) cosmological spacetimes, or small perturbations thereof. However, the a…
The relation between Lyman-alpha absorbers and gas--rich galaxies in the local universe
Marco Pierleoni, Enzo Branchini, Matteo Viel
We use high-resolution hydrodynamical simulations to investigate the spatial correlation between weak (N(HI) <10^{15} cm^{-2}) Ly-alpha absorbers and gas-rich galaxies in the local…
Sources of -tensions in dark energy scenarios
Balakrishna S. Haridasu, Matteo Viel, Nicola Vittorio
By focusing on the simple extension to CDM, we assess which epoch(s) possibly source the -tension. We consider Cosmic Microwave Background (CMB) data in three po…
Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era
Francisco Villaescusa-Navarro, Matteo Viel, David Alonso +3
We investigate the cross-correlation between the spatial distribution of Lyman Break Galaxies (LBGs) and the 21cm intensity mapping signal at . At these redshifts, gala…
"Non-cold" dark matter at small scales: a general approach
Riccardo Murgia, Alexander Merle, Matteo Viel +2
Structure formation at small cosmological scales provides an important frontier for dark matter (DM) research. Scenarios with small DM particle masses, large momenta or hidden inte…
Large-scale clustering of Lyman-alpha emission intensity from SDSS/BOSS
Rupert A. C. Croft, Jordi Miralda-Escudé, Zheng Zheng +25
(Abridged) We detect the large-scale structure of Lya emission in the Universe at redshifts z=2-3.5 by measuring the cross-correlation of Lya surface brightness with quasars in SDS…
Strong MgII systems in quasar and gamma-ray burst spectra
Cristiano Porciani, Matteo Viel, Simon J. Lilly
The incidence of strong MgII systems in gamma-ray burst (GRB) spectra is a few times higher than in quasar (QSO) spectra. We investigate several possible explanations for this effe…
Galactic Winds in Cosmological Simulations of the Circumgalactic Medium
Paramita Barai, Matteo Viel, Stefano Borgani +7
(Abridged) We explore new observationally-constrained sub-resolution models of galactic outflows and investigate their impact on the circumgalactic medium (CGM) over redshifts z =…
High-Redshift Cosmography
Vincenzo Vitagliano, Jun-Qing Xia, Stefano Liberati +1
We constrain the parameters describing the kinematical state of the universe using a cosmographic approach, which is fundamental in that it requires a very minimal set of assumptio…
Lyman-alpha Forests cool Warm Dark Matter
Julien Baur, Nathalie Palanque-Delabrouille, Christophe Yèche +2
The free-streaming of keV-scale particles impacts structure growth on scales that are probed by the Lyman-alpha forest of distant quasars. Using an unprecedentedly large sample of…
Effects of Massive Neutrinos on the Large-Scale Structure of the Universe
Federico Marulli, Carmelita Carbone, Matteo Viel +2
Cosmological neutrinos strongly affect the evolution of the largest structures in the Universe, i.e. galaxies and galaxy clusters. We use large box-size full hydrodynamic simulatio…
The Wide-field Spectroscopic Telescope (WST) Science White Paper
Vincenzo Mainieri, Richard I. Anderson, Jarle Brinchmann +214
The Wide-field Spectroscopic Telescope (WST) is proposed as a new facility dedicated to the efficient delivery of spectroscopic surveys. This white paper summarises the initial con…
Neutrino masses and cosmology with Lyman-alpha forest power spectrum
Nathalie Palanque-Delabrouille, Christophe Yeche, Julien Baur +9
We present constraints on neutrino masses, the primordial fluctuation spectrum from inflation, and other parameters of the CDM model, using the one-dimensional Ly-forest po…
Optimal galaxy survey for detecting the dipole in the cross-correlation with 21 cm Intensity Mapping
Francesca Lepori, Enea Di Dio, Eleonora Villa +1
We investigate the future perspectives of the detection of the relativistic dipole by cross-correlating the 21 cm emission in Intensity Mapping (IM) and galaxy surveys at low redsh…
Primordial Non-Gaussianity and the NRAO VLA Sky Survey
Jun-Qing Xia, Matteo Viel, Carlo Baccigalupi +3
The NRAO VLA Sky Survey (NVSS) is the only dataset that allows an accurate determination of the auto-correlation function (ACF) on angular scales of several degrees for Active Gala…
Joint constraints on thermal relic dark matter from strong gravitational lensing, the Lyman- forest, and Milky Way satellites
Wolfgang Enzi, Riccardo Murgia, Oliver Newton +10
We derive joint constraints on the warm dark matter (WDM) half-mode scale by combining the analyses of a selection of astrophysical probes: strong gravitational lensing with extend…
Non-linear evolution of the cosmic neutrino background
Francisco Villaescusa-Navarro, Simeon Bird, Carlos Peña-Garay +1
We investigate the non-linear evolution of the relic cosmic neutrino background by running large box-size, high resolution N-body simulations. Our set of simulations explore the pr…
Lyman- forest and non-linear structure characterization in Fuzzy Dark Matter cosmologies
Matteo Nori, Riccardo Murgia, Vid IrÅ¡iÄ +2
Fuzzy Dark Matter (FDM) represents an alternative and intriguing description of the standard Cold Dark Matter (CDM) fluid, able to explain the lack of direct detection of dark matt…
Galactic outflow and diffuse gas properties at z>=1 using different baryonic feedback models
Paramita Barai, Pierluigi Monaco, Giuseppe Murante +2
We measure and quantify properties of galactic outflows and diffuse gas at in cosmological hydrodynamical simulations. Our novel sub-resolution model, MUPPI, implements…
A consistent determination of the temperature of the intergalactic medium at redshift z=2.4
James S. Bolton, George D. Becker, Martin G. Haehnelt +1
We present new measurements of the thermal state of the intergalactic medium (IGM) at derived from absorption line profiles in the Ly forest. We use a large set of h…
Cosmology with Intensity Mapping via Statistics Beyond the Power Spectrum in the SKAO Era
Suman Majumdar, Debanjan Sarkar, Leon Noble +38
The cosmological distribution of neutral hydrogen (HI) during the post-reionization era is highly non-Gaussian due to the underlying non-linear structure formation, complex galaxy…
Particle dark matter searches outside the Local Group
Marco Regis, Jun-Qing Xia, Alessandro Cuoco +3
If dark matter (DM) is composed by particles which are non-gravitationally coupled to ordinary matter, their annihilations or decays in cosmic structures can result in detectable r…
Baryonic acoustic oscillations from 21cm intensity mapping: the Square Kilometre Array case
Francisco Villaescusa-Navarro, David Alonso, Matteo Viel
We quantitatively investigate the possibility of detecting baryonic acoustic oscillations (BAO) using single-dish 21cm intensity mapping observations in the post-reionization era.…
One likelihood to bind them all: Lyman- constraints on non-standard dark matter
Deanna C. Hooper, Nils Schöneberg, Riccardo Murgia +3
Recent cosmological tensions have rekindled the search for models beyond CDM that cause a suppression of the matter power spectrum. Due to the small scales accessible to Lyman-…
Post-inflationary axion constraints from the Lyman- forest
Olga Garcia-Gallego, Vid IrÅ¡iÄ, Matteo Viel +2
Among the most compelling cold dark matter candidates, the axion has recently been subject to a wide range of astrophysical studies aiming to constraints its properties. We present…
Primordial magnetic fields: consistent initial conditions and impact on high-z structures
Pranjal Ralegankar, Mak PaviÄeviÄ, Matteo Viel
Primordial magnetic fields (PMFs) can enhance matter power spectrum on small scales ( Mpc) and still agree with bounds from cosmic microwave background (CMB) and Faraday…
Measuring redshift-space distortions with future SKA surveys
Alvise Raccanelli, Philip Bull, Stefano Camera +8
The peculiar motion of galaxies can be a particularly sensitive probe of gravitational collapse. As such, it can be used to measure the dynamics of dark matter and dark energy as w…
Damped Lyman-alpha systems in high-resolution hydrodynamical simulations
Edoardo Tescari, Matteo Viel, Luca Tornatore +1
We investigate the properties of Damped Lyman-alpha systems (DLAs) using high-resolution and large box-size cosmological hydrodynamical simulations of a LambdaCDM model. The numeri…
Spatial fluctuations in the spectral shape of the UV background at 2<z<3 and the reionization of helium
James S. Bolton, Martin G. Haehnelt, Matteo Viel +1
The low density hydrogen and helium in the IGM probed by QSO absorption lines is sensitive to the amplitude and spectral shape of the metagalactic UV background. We use realistic H…
Kinetic or thermal AGN feedback in simulations of isolated and merging disk galaxies calibrated by the M-sigma relation
Paramita Barai, Matteo Viel, Giuseppe Murante +2
(Abridged) We investigate two modes of coupling the feedback energy from a central AGN to the neighboring gas in galaxy simulations: kinetic - velocity boost, and thermal - heating…
Redshift-Space Distortions in Massive Neutrinos Cosmologies
Francesco Verdiani, Emilio Bellini, Chiara Moretti +3
We study the Kaiser formula for biased tracers in massive neutrino cosmologies by comparing its predictions with a large set of N-body simulations. In particular, we examine the am…
Forest without Trees is still Fruitful: Constraints on the thermal state of the neutral IGM at with the 21-cm forest power spectrum
Tomáš Šoltinský, Arnab Chakraborty, Girish Kulkarni +10
Neutral regions of the intergalactic medium (IGM) during the Epoch of Reionization (EoR) remain largely unexplored due to the limitations of existing probes. Owing to discoveries o…
Baryon Acoustic Oscillations reconstruction with pixels
Andrej Obuljen, Francisco Villaescusa-Navarro, Emanuele Castorina +1
Gravitational non-linear evolution induces a shift in the position of the baryon acoustic oscillations (BAO) peak together with a damping and broadening of its shape that bias and…
A coarse grained perturbation theory for the Large Scale Structure, with cosmology and time independence in the UV
Alessandro Manzotti, Marco Peloso, Massimo Pietroni +2
Standard cosmological perturbation theory (SPT) for the Large Scale Structure (LSS) of the Universe fails at small scales (UV) due to strong nonlinearities and to multistreaming ef…
Ringing of the Reionization: A first direct measurement of the intergalactic pressure smoothing scale at redshift z>4.2 as imprinted onto small-scale peculiar velocities in the Lyman-alpha forest
Vid IrÅ¡iÄ, Matteo Viel, Martin G. Haehnelt +3
The epoch of reionization leaves detectable imprints in the thermal history of the Universe. In particular, the fast ionization fronts passing over cold gas in the cosmic web overp…
Exploring galaxies-gravitational waves cross-correlations as an astrophysical probe
Giulio Scelfo, Lumen Boco, Andrea Lapi +1
Gravitational waves astronomy has opened a new opportunity to study the Universe. Full exploitation of this window can especially be provided by combining data coming from gravitat…
Imprints of non-standard Dark Energy and Dark Matter Models on the 21cm Intensity Map Power Spectrum
Isabella P. Carucci, Pier-Stefano Corasaniti, Matteo Viel
We study the imprint of non-standard dark energy (DE) and dark matter (DM) models on the 21cm intensity map power spectra from high-redshift neutral hydrogen (HI) gas. To this purp…
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: weighing the neutrino mass using the galaxy power spectrum of the CMASS sample
Gong-Bo Zhao, Shun Saito, Will J. Percival +15
We measure the sum of the neutrino particle masses using the three-dimensional galaxy power spectrum of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 9 (…
The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
Isabelle Pâris, Patrick Petitjean, Nicholas P. Ross +43
We present the Data Release 12 Quasar catalog (DR12Q) from the Baryon Oscillation Spectroscopic Survey (BOSS) of the SDSS-III. This catalog includes all SDSS-III/BOSS objects that…
Beyond two-point statistics: using the minimum spanning tree as a tool for cosmology
Krishna Naidoo, Lorne Whiteway, Elena Massara +5
Cosmological studies of large-scale structure have relied on two-point statistics, not fully exploiting the rich structure of the cosmic web. In this paper we show how to capture s…
Probing the large-scale structure with 21cm-galaxy cross-bispectrum: Estimates from simulations and forecasts for upcoming cosmological surveys
Leon Noble, Suman Majumdar, Matteo Viel +7
The paper investigates the 21 cm–galaxy cross‑bispectrum using simulated galaxy evolution models and forecasts its detectability with upcoming Euclid‑like galaxy surveys and SKA‑Mi…
The Alcock Paczynski test with Baryon Acoustic Oscillations: systematic effects for future surveys
Francesca Lepori, Enea Di Dio, Matteo Viel +2
We investigate the Alcock Paczynski (AP) test applied to the Baryon Acoustic Oscillation (BAO) feature in the galaxy correlation function. By using a general formalism that include…
Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys
Mario Ballardini, Riccardo Murgia, Marco Baldi +2
Galaxy surveys are an important probe for superimposed oscillations on the primordial power spectrum of curvature perturbations, which are predicted in several theoretical models o…
Realistic sterile neutrino dark matter with keV mass does not contradict cosmological bounds
Alexey Boyarsky, Julien Lesgourgues, Oleg Ruchayskiy +1
Previous fits of sterile neutrino dark matter models to cosmological data assumed a peculiar production mechanism, which is not representative of the best-motivated particle physic…
TORRCH: Tomographic reconstruction of the reionization of cosmic hydrogen with Ly emitters and non-Ly-selected galaxies
Soumak Maitra, Girish Kulkarni, Vipul Arora +5
Tomographic reconstruction of reionization is a long-sought goal. It would move the field beyond global summary statistics, such as the volume-averaged ionised fraction, to direct,…
Cosmology with massive neutrinos III: the halo mass function and an application to galaxy clusters
Matteo Costanzi, Francisco Villaescusa-Navarro, Matteo Viel +4
We use a suite of N-body simulations that incorporate massive neutrinos as an extra-set of particles to investigate their effect on the halo mass function. We show that for cosmolo…
High-z cosmography at a glance
Vincenzo Vitagliano, Jun-Qing Xia, Stefano Liberati +1
Cosmography is the tool that makes possible to untie the interpretation of cosmological observations from the definition of any dynamical prior. We review the constraints on the co…
New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman- forest data
Vid IrÅ¡iÄ, Matteo Viel, Martin G. Haehnelt +12
We present new measurements of the free-streaming of warm dark matter (WDM) from Lyman- flux-power spectra. We use data from the medium resolution, intermediate redshift XQ-100…
The Impact of Coupled Dark Energy Cosmologies on the High-Redshift Intergalactic Medium
Marco Baldi, Matteo Viel
We present an analysis of high-resolution hydrodynamical N-body simulations of coupled dark energy cosmologies which focusses on the statistical properties of the transmitted Lyman…
The effect of stellar and AGN feedback on the low redshift Lyman- forest in the Sherwood simulation suite
Fahad Nasir, James S. Bolton, Matteo Viel +4
We study the effect of different feedback prescriptions on the properties of the low redshift () Ly forest using a selection of hydrodynamical simulations drawn from…
Cosmology with the lyman-alpha forest in the WMAP era
Matteo Viel
In the WMAP era of high precision cosmology an accurate determination of the matter power spectrum from lyman-alpha forest data becomes crucial. When combining the matter power spe…
Reconstructing the dark energy density in light of DESI BAO observations
Maria Berti, Emilio Bellini, Camille Bonvin +3
In light of the evidence for dynamical dark energy (DE) found from the most recent Dark Energy Spectroscopic Instrument (DESI) baryon acoustic oscillation (BAO) measurements, we pe…
Weighing neutrinos with cosmic neutral hydrogen
Francisco Villaescusa-Navarro, Philip Bull, Matteo Viel
We investigate the signatures left by massive neutrinos on the spatial distribution of neutral hydrogen (HI) in the post-reionization era by running hydrodynamic simulations that i…
The halo model in a massive neutrino cosmology
Elena Massara, Francisco Villaescusa-Navarro, Matteo Viel
We provide a quantitative analysis of the halo model in the context of massive neutrino cosmologies. We discuss all the ingredients necessary to model the non-linear matter and col…
Constraints on Primordial Magnetic Fields from the Lyman-α forest
Mak PaviÄeviÄ, Vid IrÅ¡iÄ, Matteo Viel +5
We present the first constraints on primordial magnetic fields from the Lyman- forest using full cosmological hydrodynamic simulations. At the scales and redshifts probed by th…
Possible evidence for a large-scale enhancement in the Lyman- forest power spectrum at redshift
Margherita Molaro, Vid IrÅ¡iÄ, James S. Bolton +5
Inhomogeneous reionization enhances the 1D Lyman- forest power spectrum on large scales at redshifts . This is due to coherent fluctuations in the ionized hydrogen frac…
The First Billion Years of a Warm Dark Matter Universe
Umberto Maio, Matteo Viel
We present results of cosmological N-body hydrodynamic chemistry simulations of primordial structure growth and evolution in a scenario with warm dark matter (WDM) having a mass of…
Cosmology with massive neutrinos I: towards a realistic modeling of the relation between matter, haloes and galaxies
Francisco Villaescusa-Navarro, Federico Marulli, Matteo Viel +4
By using a suite of large box-size N-body simulations that incorporate massive neutrinos as an extra set of particles, we investigate the impact of neutrino masses on the spatial d…
Neutrino mass bounds from confronting an effective model with BOSS Lyman-alpha data
Mathias Garny, Thomas Konstandin, Laura Sagunski +1
We present an effective model for the one-dimensional Lyman- flux power spectrum far above the baryonic Jeans scale. The main new ingredient is constituted by a set of two para…
The one-dimensional Ly-alpha forest power spectrum from BOSS
Nathalie Palanque-Delabrouille, Christophe Yèche, Arnaud Borde +33
We have developed two independent methods to measure the one-dimensional power spectrum of the transmitted flux in the Lyman- forest. The first method is based on a Fourier tra…
Squeezing the window on isocurvature modes with the Lyman-alpha forest
Maria Beltran, Juan Garcia-Bellido, Julien Lesgourgues +1
Various recent studies proved that cosmological models with a significant contribution from cold dark matter isocurvature perturbations are still compatible with most recent data o…
Late-time decaying dark matter: constraints and implications for the -tension
Balakrishna S. Haridasu, Matteo Viel
We constrain and update the bounds on the life-time of a decaying dark matter model with a warm massive daughter particle using the most recent low-redshift probes. We use Supernov…
Enhancing the Spectral Hardening of Cosmic TeV Photons by Mixing with Axionlike Particles in the Magnetized Cosmic Web
Daniele Montanino, Franco Vazza, Alessandro Mirizzi +1
Large-scale extragalactic magnetic fields may induce conversions between very-high-energy photons and axionlike particles (ALPs), thereby shielding the photons from absorption on t…
The effect of neutrinos on the matter distribution as probed by the Intergalactic Medium
Matteo Viel, Martin G. Haehnelt, Volker Springel
We present a suite of full hydrodynamical cosmological simulations that quantitatively address the impact of neutrinos on the (mildly non-linear) spatial distribution of matter and…
The Baryon Oscillation Spectroscopic Survey of SDSS-III
Kyle S. Dawson, David J. Schlegel, Christopher P. Ahn +162
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in the clustering of matter over a larger volume than the…
The Lyman-alpha forest power spectrum from the XQ-100 Legacy Survey
Vid IrÅ¡iÄ, Matteo Viel, Trystyn A. M. Berg +12
We present the Lyman- flux power spectrum measurements of the XQ-100 sample of quasar spectra obtained in the context of the European Southern Observatory Large Programme "Quas…
Weighing Cosmic Structures with Clusters of Galaxies and the Intergalactic Medium
Matteo Esposito, Vid IrÅ¡iÄ, Matteo Costanzi +3
We present an analysis aimed at combining cosmological constraints from number counts of galaxy clusters identified through the Sunyaev-Zeldovich effect, obtained with the South Po…
The Impact of Simulations in Cosmology and Galaxy Formation A summary of the Workshop NOVICOSMO 2008
Paolo Salucci, Stefano Borgani, Carlos Frenk +2
In the study of the process of cosmic structure formation numerical simulations are crucial tools to interface observational data to theoretical models and to investigate issues ot…
Anharmonic Effects on the Squeezing of Axion Perturbations
Valentina Danieli, Takeshi Kobayashi, Nicola Bartolo +2
It is assumed in standard cosmology that the Universe underwent a period of inflation in its earliest phase, providing the seeds for structure formation through vacuum fluctuations…
Lyman-alpha constraints on warm and on warm-plus-cold dark matter models
Alexey Boyarsky, Julien Lesgourgues, Oleg Ruchayskiy +1
We revisit Lyman-alpha bounds on the dark matter mass in Lambda Warm Dark Matter (Lambda-WDM) models, and derive new bounds in the case of mixed Cold plus Warm models (Lambda-CWDM)…
Minimally Parametric Power Spectrum Reconstruction from the Lyman-alpha Forest
Simeon Bird, Hiranya V. Peiris, Matteo Viel +1
Current results from the Lyman alpha forest assume that the primordial power spectrum of density perturbations follows a simple power law form, with running. We present the first a…
Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
Nicolás G. Busca, Timothée Delubac, James Rich +59
We report a detection of the baryon acoustic oscillation (BAO) feature in the three-dimensional correlation function of the transmitted flux fraction in the \Lya forest of high-red…
The rise of the C IV mass density at z<2.5
Valentina D'Odorico, Francesco Calura, Stefano Cristiani +1
The cosmic evolution of the metal content of the intergalactic medium puts stringent constraints on the properties of galactic outflows and on the nature of UV background. In this…
Cosmic voids and BAO with relative baryon-CDM perturbations
Hasti Khoraminezhad, Pauline Vielzeuf, Titouan Lazeyras +2
We study the statistics of various large-scale structure tracers in gravity-only cosmological simulations including baryons and cold dark matter (CDM) initialized with two differen…
Impact of dark matter models on the EoR 21-cm signal bispectrum
Anchal Saxena, Suman Majumdar, Mohd Kamran +1
The nature of dark matter sets the timeline for the formation of first collapsed halos and thus affects the sources of reionization. Here, we consider two different models of dark…
Neutrino Signatures on the High Transmission Regions of the Lyman-alpha Forest
Francisco Villaescusa-Navarro, Mark Vogelsberger, Matteo Viel +1
We quantify the impact of massive neutrinos on the statistics of low density regions in the intergalactic medium (IGM) as probed by the Lyman-alpha forest at redshifts z=2.2--4. Ba…
Relativistic effects in Lyman-alpha forest
Vid IrÅ¡iÄ, Enea Di Dio, Matteo Viel
We present the calculation of the Lyman-alpha (Lyman-) transmitted flux fluctuations with full relativistic corrections to the first order. Even though several studies exist on…
Expansion and Collapse in the Cosmic Web
Michael Rauch, George D. Becker, Matteo Viel +5
We study the kinematics of the gaseous cosmic web at high redshift with Lyman alpha forest absorption in multiple QSO sightlines. Using a simple analytic model and a cosmological h…
Influence of the Spectral Energy Distribution of Reionization-Era Sources on the Lyman- Forest
Arghyadeep Basu, Benedetta Ciardi, James S. Bolton +2
Interpreting Lyman- forest properties during the epoch of reionization requires assumptions about the spectral energy distribution (SED) of ionizing sources. These are often si…
The Quijote simulations
Francisco Villaescusa-Navarro, ChangHoon Hahn, Elena Massara +26
The Quijote simulations are a set of 44,100 full N-body simulations spanning more than 7,000 cosmological models in the hyperpl…
JWST high-z galaxy constraints on warm and cold dark matter models
Umberto Maio, Matteo Viel
We compare properties of high-redshift galaxies observed by JWST with hydrodynamical simulations, in the standard cold dark matter model and in warm dark matter models with a suppr…
The Non-Linear Power Spectrum of the Lyman Alpha Forest
Andreu Arinyo-i-Prats, Jordi Miralda-Escudé, Matteo Viel +1
The Lyman alpha forest power spectrum has been measured on large scales by the BOSS survey in SDSS-III at , has been shown to agree well with linear theory predictions,…
Cosmology with Multi-Wavelength Line Intensity Mapping Synergies in the SKAO Era
Debanjan Sarkar, Suman Majumdar, Chandra Shekhar Murmu +21
Line intensity mapping (LIM) has emerged as a powerful tool for surveying the large-scale structure of the Universe across cosmic time by measuring spatial fluctuations in the cumu…
The impact of spatial fluctuations in the ultra-violet background on intergalactic carbon and silicon
James S. Bolton, Matteo Viel
Spatial inhomogeneities in the spectral shape of the ultra-violet background (UVB) at the tail-end of HeII reionisation are thought to be the primary cause of the large fluctuation…
Testing gravity with gravitational waves electromagnetic probes cross-correlations
Giulio Scelfo, Maria Berti, Alessandra Silvestri +1
In a General Relativistic framework, Gravitational Waves (GW) and Electromagnetic (EM) waves are expected to respond in the same way to the effects of matter perturbations between…
On the importance of high redshift intergalactic voids
Matteo Viel, Joerg M. Colberg, Tae-Sun Kim
We investigate the properties of one--dimensional flux ``voids'' (connected regions in the flux distribution above the mean flux level) by comparing hydrodynamical simulations of l…
The impact of massive neutrinos on halo assembly bias
Titouan Lazeyras, Francisco Villaescusa-Navarro, Matteo Viel
Using the publicly available Quijote simulations, we present the first measurements of the assembly bias of dark matter halos in N-body simulations which include massive neutrinos.…
Tomography of the Fermi-LAT gamma-ray diffuse extragalactic signal via cross-correlations with galaxy catalogs
Jun-Qing Xia, Alessandro Cuoco, Enzo Branchini +1
Building on our previous cross-correlation analysis (Xia et al. 2011) between the isotropic gamma-ray background (IGRB) and different tracers of the large-scale structure of the un…
A cross-correlation study of the Fermi-LAT -ray diffuse extragalactic signal
Jun-Qing Xia, Alessandro Cuoco, Enzo Branchini +2
In this work, starting from 21 months of data from the Fermi-Large Area Telescope, we derive maps of the residual isotropic gamma-ray emission, a relevant fraction of which is expe…
Studying the Warm-Hot Intergalactic Medium in Emission
Yoh Takei, Eugenio Ursino, Enzo Branchini +14
We assess the possibility to detect the warm-hot intergalactic medium (WHIM) in emission and to characterize its physical conditions and spatial distribution through spatially reso…
The BOSS Lyman-alpha Forest Sample from SDSS Data Release 9
Khee-Gan Lee, Stephen Bailey, Leslie E. Bartsch +50
We present the BOSS Lyman-alpha (Lya) Forest Sample from SDSS Data Release 9, comprising 54,468 quasar spectra with zqso > 2.15 suitable for Lya forest analysis. This data set prob…
DeepCHART: Mapping the 3D dark matter density field from Ly forest surveys using deep learning
Soumak Maitra, Matteo Viel, Girish Kulkarni
We present DeepCHART (Deep learning for Cosmological Heterogeneity and Astrophysical Reconstruction via Tomography), a deep learning framework designed to reconstruct the three-dim…
Simulated star formation rate functions at z~4-7, and the role of feedback in high-z galaxies
Edoardo Tescari, Antonios Katsianis, Stuart Wyithe +5
We study the role of feedback from supernovae and black holes in the evolution of the star formation rate function (SFRF) of z~4-7 galaxies. We use a new set of cosmological hydrod…
21cm Intensity Mapping cross-correlation with galaxy surveys: current and forecasted cosmological parameters estimation for the SKAO
Maria Berti, Marta Spinelli, Matteo Viel
We present a comprehensive set of forecasts for the cross-correlation signal between 21cm intensity mapping and galaxy redshift surveys. We focus on the data sets that will be prov…
The Denario project: Deep knowledge AI agents for scientific discovery
Francisco Villaescusa-Navarro, Boris Bolliet, Pablo Villanueva-Domingo +33
We present Denario, an AI multi-agent system designed to serve as a scientific research assistant. Denario can perform many different tasks, such as generating ideas, checking the…
Scrutinizing Early Dark Energy models through CMB lensing
Balakrishna S. Haridasu, Hasti Khoraminezhad, Matteo Viel
We investigate early dark energy models in the context of the lensing anomaly by considering two different Cosmic Microwave Background (CMB) datasets: a complete Planck, and a seco…