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Research Areas
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Contact and Personal Information
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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 Lyman-alpha quantities to constrain standard and non-standard cosmological scenarios (e.g. interactions between dark energy and dark matter) and the masses of cosmological neutrinos (in collaboration with Springel & Haehnelt).
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, n and its running), on slow-roll inflationary models, on the mass of warm dark matter particles such as light gravitinos or sterile neutrinos.
Warm Hot Intergalactic Medium -- I am currently using hydro-dynamical simulations and the Tully catalog of galatic luminosity density in the local universe to study the distribution of warm-hot intergalatic medium and its detectability, focussing in particular on GRBs. I am also addressing the impact of several different feedback mechanisms on the low redshift IGM.
The UV background and metal enrichment -- 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. I rely on a modified version of the hydrodynamic code (G-II) that
incorporates a chemodynamical model with feedback recipes (work in collaboration with Tornatore, Tescari, Borgani, Cristiani, D'Odorico)
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).
Large-scale structure/CMB cross correlation I am investigating cross-correlation of the Lyman-alpha forest flux with CMB lensing and of the quasar distribution with CMB temperature. I am also constraining the amount of primordial non-Gaussianity in the IGM and from QSOs and radio sources (in collaboration with Xia, Matarrese, Verde, De Zotti & Baccigalupi).
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INAF Osservatorio Astronomico
via Tiepolo 11
I-34143 Trieste
Italy
Tel: +39 040 3199233
Fax: +39 040 3199241
email: viel(at)oats.inaf.it
CV: [pdf-file]
Publications at ADS Publications at arXiv Publications at SPIRES
cosmoIGM:
cosmoIGM - The Intergalactic Medium as a cosmological tool
outreach:
ESI-TOPICS THOMSON
outreach:
RADIOFEST
outreach:
STREET SCIENCE
outreach:
DALLE STALLE ALLE STELLE
outreach:
SIMULATIONS and PUBLIC CONFERENCES
teaching:
Structure formation lectures at SISSA 2011
teaching:
Lecture on neutrinos and large scale structure
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Recent Publications List of publications
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Links
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Constraints on neutrino masses from SDSS-III/BOSS Ly-alpha forest and other cosmological probes
Palanque-Delabrouille, Yeche, Lesgourgues, Rossi, Borde, Viel et al.
PREPRINT arXiv 1410.7244
Neutrino constraints: what large-scale structure and CMB data are telling us?
Costanzi, Sartoris, Viel, Borgani
PREPRINT arXiv 1407.8338
Cosmology with massive neutrinos I: towards a realistic modeling of the relation between matter, haloes and galaxies
Villaescusa-Navarro, Marulli, Viel, Branchini, Castorina, Sefusatti, Saito
PREPRINT arXiv 1311.0866 - 2014JCAP...03..011V
Modeling the neutral hydrogen distribution in the post-reionization Universe: intensity mapping
Villaescusa-Navarro, Viel, Datta, Choudhury
PREPRINT arXiv 1405.6713 - 2014JCAP...09..050V
Kinetic or thermal AGN feedback in simulations of isolated and merging disc galaxies calibrated by the M-sigma relation
Barai, Viel, Murante, Gaspari, Borgani
PREPRINT arXiv 1307.5326 - 2014MNRAS.437.1456B
Warm dark matter as a solution to the small scale crisis: New constraints from high redshift Lyman-alpha forest data
Viel, Becker, Bolton, Haehnelt
PREPRINT arXiv 1306.2314 - 2013PhRvD..88d3502V
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Scientific ones (archives, institutes & computing centers):
Astro-ph
ADS
RTN network "The Physics of the IGM"
LUQAS sample
INAF Istituto Nazionale di Astrofisica
INFN Istituto Nazionale di Fisica Nucleare
Astronomy Department Trieste University
Dipartimento di Fisica Padova
MPA Garching - Germany
Institute of Astronomy Cambrige - UK
COSMOS supercomputer DAMTP, Cambridge - UK
Darwin Cluster High Performance Computer Service (HPCS) Cambridge - UK
CINECA SP6 (Italy) Cambridge - UK
COSMOCOMP ITN Network
COMPUTATIONAL COSMOLOGY GROUP IN TRIESTE
Non Scientific ones:
BBC
CNN
La Repubblica
FC Internazionale
Soccer News
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