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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
cosmoIGM:
ERC: cosmoIGM publications (draft version)
cosmoIGM:
ERC: cosmoIGM final activity report (draft version)
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 School ISAPP23 - Neutrino Cosmology - Varenna (July 2023):
Lecture 1
Linear theory
Lecture 2
Non-linearities
Lecture 3
IGM and neutrinos
Lecture 4
New neutrino probes
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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JWST high-z galaxies constraints on warm and cold dark matter models
Maio, Umberto; Viel, Matteo
PREPRINT eprint arXiv:2211.03620 arXiv:2211.03620
Testing gravity with gravitational waves X electromagnetic probes cross-correlations
Scelfo, Giulio; Berti, Maria; Silvestri, Alessandra; Viel, Matteo
PREPRINT eprint arXiv:2210.02460 arXiv:2210.02460
Multipole expansion for 21cm Intensity Mapping power spectrum:
forecasted cosmological parameters estimation for the SKA
Observatory
Berti, Maria; Spinelli, Marta; Viel, Matteo
PREPRINT eprint arXiv:2209.07595 arXiv:2209.07595
Studying the Warm Hot Intergalactic Medium in emission: a reprise
Parimbelli, G. ; Branchini, E. ; Viel, M. ; Villaescusa-Navarro, F. ; ZuHone, J.
PREPRINT eprint
arxXiv:2209.00657
Hints of dark photon dark matter from observations and hydrodynamical simulations of the low-redshift Lyman-alpha forest
Bolton, James S.; Caputo, Andrea ; Liu, Hongwan ; Viel, Matteo
PREPRINT eprint arXiv:2206.13520 - Phys. Rev. Lett. 129, 211102 (2022)
The Sherwood-Relics simulations: overview and impact of patchy reionization and pressure smoothing on the intergalactic medium
Puchwein, Ewald ; Bolton, James S. ; Keating, Laura C. ;
Molaro, Margherita ; Gaikwad, Prakash ; Kulkarni, Girish ; Haehnelt,
Martin G. ; Irsic, Vid ; Soltinsky, Tomas ; Viel, Matteo ; Aubert, Dominique ; Becker, George D. ; Meiksin, Avery
PREPRINT eprint arXiv:2207.13098
Weighing cosmic structures with clusters of galaxies and the intergalactic medium
Esposito, Matteo; Irsic, Vid ; Costanzi, Matteo ; Borgani, Stefano ; Saro, Alexandro ; Viel, Matteo
Monthly Notices of the Royal Astronomical Society, Volume 515, Issue
1, pp.857-870 arXiv:2202.00974
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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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