[astroseminar at Sapienza] next QUID ULTRA colloquium by Piero Madau, June 22 2021 at 16:30

[raffaella.schneider at roma1.infn.it]

Dear Colleagues,

we are pleased to announce that the seventh colloquium of the program QUID ULTRA? Frontiers and Controversies in Astrophysics, 
will be on June 22 2021 at 16:30 by Piero Madau (University of California, Santa Cruz).  Title and abstract
are attached below. 

The program QUID ULTRA? Frontiers and Controversies in Astrophysics is a series of monthly prestigious colloquia that will be 
running from early February till December 2021. This initiative has been funded by Sapienza University with the co-sponsorship of 
INAF/Astronomical Observatory of Rome and of the joint PhD program in Astronomy, Astrophysics and Space Science of Sapienza, 
Tor Vergata University and INAF.

Looking forward to seeing you soon, 

Raffaella Schneider (on behalf of the SOC)

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June 22 2021 at 16:30

Piero Madau (University of California, Santa Cruz)

Title: The dark and luminous side of structure formation

Abstract: 
The beaded filamentary network of intergalactic gas in which galaxies form and evolve,  and which gives origin to a “forest”  of hydrogen Lyman-alpha absorption lines in the 
spectra of distant quasars, encodes information on the physics of structure formation, the nature of the dark matter,  the temperature and ionization state of baryons in the 
Universe. The potential of the Lyman-alpha forest for constraining with percent accuracy the matter density distribution on medium to small cosmological scales has motivated 
the construction of the Dark Energy Spectroscopic Instrument (DESI), which will measure absorption line spectra backlit by nearly a million high-redshift (z >2) quasars. 
In this talk I will describe the multiple steps needed to connect flux fluctuations in quasar spectra to physical parameters, present an unprecedented suite of  hundreds of  
high-resolution hydrodynamical simulations of structure formation with different  thermal histories, and use it to perform a statistical comparison of mock spectra with the 
observed 1D flux power spectrum and other data. A likelihood analysis shows that, over the last 13 billion years,  gas in the cosmic web experienced four main heating and 
cooling epochs.


Join Zoom Meeting
https://uniroma1.zoom.us/j/83598894783?pwd=NTBKeTZ2cU4vRW5xdVc4NDNpVDlidz09 <https://uniroma1.zoom.us/j/83598894783?pwd=NTBKeTZ2cU4vRW5xdVc4NDNpVDlidz09>

Meeting ID: 835 9889 4783
Passcode: 358787
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