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Research Areas
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Contact and Personal Information
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Intergalactic Medium: the Lyman-alpha forest -- is the
absorption produced by neutral hydrogen seen in the spectra of
background quasars. I am interested in using the Lyman-alpha forest to
recover the linear dark matter power spectrum at scales of 1-40
comoving Mpc which are not probed by other observables. I am
interested in using the intergalactic medium to constrain standard and
non-standard cosmological scenarios (e.g. interactions between dark
energy and dark matter, properties of dark matter) and the masses of
cosmological neutrinos.
Intensity Mapping @ 21cm: -- is the electromagnetic radiation
spectral line that is created by a change in the energy state of
neutral hydrogen atoms, it is an emission process and can probe the
large scale structure in a way complementary to the IGM absorption.
The signal is modelled both analytically or with hydro simulations.
The nature of dark matter -- I am using hydro-dynamical
simulations and high resolution data to constraints the properties
of dark matter at the small scales (cold/warm dark matter and
sterile neutrinos), in particular non cold dark matter models like:
thermal WDM, fuzzy DM, mixed models, sterile neutrinos.
Structure formation from large to small scales -- I am broadly
interested in structure formation using state-of-the-art data sets
like BAO, galaxy redshift surveys, weak lensing, IGM data and I try
hard to disentangle between astrophysical processes and fundamental
physical processes by exploiting different redshifts and
scales. These
efforts are focussing on probing the geometrical and dynamical state
of the Universe in the matter dominated era at z=2-6.
Cosmological parameters estimation -- When the dark matter
power spectrum inferred from Lyman-alpha quasar spectra is combined
with the Cosmic Microwave Background data we can get tight
constraints on cosmological parameters (sigma_8, spectral index),
on inflationary models, on the mass of warm dark matter
particles such as light gravitinos or sterile neutrinos.
Warm Hot Intergalactic Medium -- I am using
hydro-dynamical simulations to address the impact of several
different feedback mechanisms on the low redshift IGM. In general
the low-z IGM is a feedback thermometer (e.g. Viel+17) and potentially a probe of
new physics via dark photon heating of the cosmic web (Bolton+22 --
see below).
The Circumgalactic Medium --
I am using hydro-dynamical simulations to give constraints on the
amplitude and shape of the UV background and on the metal enrichment
at z=3 and on the physical state of the CGM. I rely on a modified version of the hydrodynamic code (G-III)
that incorporates a chemodynamical model with different feedback
recipes (energy and momentum driven winds powered by SNe, AGN feedback).
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SISSA
via Bonomea, 265
I-34136 Trieste
Italy
Tel: +39 040 3787517
email: viel(at)sissa.it
full CV: [pdf-file]
Publications at ADS Publications at arXiv Publications at INSPIRE-HEP
Google Scholar
link
NEWS:
National Center of Super Computing - Official start of Astrophysics
and Cosmos Observations activities
NEWS:
Physics Magazine:
Heating up dark matter with the IGM
NEWS:
Phys.org:
Dark photons as intergalactic heat source
Teaching @ PhD Winter School 2022 - Tenerife (November 2022):
Lecture 1
Intensity Mapping
Lecture 2
IGM
Lecture 3
Galaxy Clustering
Lecture 4
Weak lensing and GCs
teaching:
Structure formation
lectures at SISSA (since 2011)
teaching:
Lecture on
neutrinos and large scale structure
outreach:
ESI-TOPICS THOMSON
outreach:
RADIOFEST
outreach:
STREET SCIENCE
outreach:
DALLE STALLE ALLE STELLE
outreach:
SIMULATIONS and PUBLIC CONFERENCES
outreach:
Trieste next event - La scienza del futuro
outreach:
local press article
outreach:
Youtube
interview in Italian
outreach:
DM LECTURE ON
YOUTUBE - SISSA FREE Cosmology online course edited by P. Salucci
outreach:
Public
conference (youtube link)
seminar:
Seminar at
Simons CCA - New York Feb. 2020 - youtube link
seminar:
talk @
Fundamental Cosmology Meeting - Granada - Nov 22
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Recent Publications
Full List of publications
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Links
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Constraints on Ultra-Light Axions from the DESI DR1 Full Shape, Planck and ACT
Francesco Verdiani, Emanuele Castorina, Ennio Salvioni, Emiliano Sefusatti, Matteo Viel
PREPRINT eprint arXiv:2607.11876 arXiv:2607.11876
The impact of the IGM thermal state on the Lyα flux 3D power spectrum from linear to highly non-linear scales
Tomas Soltinsky, Gabriele Autieri, Vid Irsic, Matteo Viel
PREPRINT eprint arXiv:2608.24784 arXiv:2608.24784
Physical Calibration of a Minimal Effective Field Theory of the Three-Dimensional Lyman-α Forest
Gabriele Autieri, Vid Iršič, Tomas Soltinsky, Matteo Viel
PREPRINT eprint arXiv:2608.21226 arXiv:2608.21226
High resolution Lyman-alpha forest constraints on dark matter-neutrino scattering
Markus R. Mosbech, Olga Garcia-Gallego, Vid Irsic, Matteo Viel, Julien Lesgourgues
PREPRINT eprint arXiv:2607.15020
arXiv:2607.15020
Field-level multi-tracers simulation-based inference of cosmological parameters from 3D maps
Giulio Scelfo, Satvik Mishra, Mauro Rigo, Roberto Trotta, Matteo Viel
PREPRINT eprint arXiv:2605.26210
arXiv:2605.26210
Post-inflationary axion constraints from the Lyman-alpha forest
Olga Garcia-Gallego, Vid Irsic, Matteo Viel, Martin G. Haehnelt, James S. Bolton
PREPRINT eprint arXiv:2603.04401
arXiv:2603.04401
Cosmo-FOLD: Fast generation and upscaling of field-level cosmological maps with overlap latent diffusion
Satvik Mishra, Roberto Trotta, Matteo Viel
PREPRINT eprint arXiv:2601.14377
arXiv:2601.14377
Influence of the Spectral Energy Distribution of Reionization-Era Sources on the Lyman-alpha Forest
Arghyadeep Basu, Benedetta Ciardi, James S. Bolton, Matteo Viel, Enrico Garaldi
PREPRINT eprint arXiv:2509.15179
arXiv:2509.15179
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Science (archives, institutes & computing centers):
INAF
INAF - OATS
Astro-ph
ADS
RTN network "The Physics of the IGM"
INAF Istituto Nazionale di Astrofisica
INFN Istituto Nazionale di Fisica Nucleare
Physics Department Trieste University
Dipartimento di Fisica e
Astronomia Padova
MPA Garching - Germany
Institute of Astronomy Cambrige - UK
COSMOS supercomputer DAMTP, Cambridge - UK
Darwin Cluster High Performance Computer Service (HPCS) Cambridge - UK
CINECA Italy
COSMOCOMP ITN Network
PACO VILLAESCUSA's public software
COMPUTATIONAL COSMOLOGY GROUP IN TRIESTE
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