[astroseminar at Sapienza] gentle reminder: next Quid Ultra colloquium by Piero Madau, today at 16:30

[raffaella.schneider at roma1.infn.it]

Dear Colleagues,

this is to gently remind you that the next online colloquium of the series: 

Quid Ultra? Frontiers and Controversies in Astrophysics 

will be today at 16:30. You can find all the details below and the updated program 
for future colloquia at the link:  https://www.quidultra.it <https://www.quidultra.it/>

Looking forward to seeing you soon, 

Raffaella Schneider (on behalf of the SOC)
  
Prof. Raffaella Schneider
Dipartimento di Fisica "G. Marconi”
Senior Fellow, Scuola Superiore di Studi Avanzati Sapienza
Sapienza, Università di Roma
P.le A. Moro 2, 00185 Roma, Italy
raffaella.schneider at roma1.infn.it <mailto:raffaella.schneider at roma1.infn.it>


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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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