[Physics-grads-open] Physics & Astronomy Student Seminar (PASS), Chris, 2/22 (Wed) at 4 pm: "Modeling Reionization from Small to Large Scales"

[Ming-Feng Ho]

Chris's talk will take place in 30 mins at Physics 3027 and on Zoom. We do
not provide coffee, but *you can grab a cup at the Grad Student Coffee
Social (from 3-4pm in front of the Physics Building) before coming.* :)

https://ucr.zoom.us/j/92989373544?pwd=VlUybFJ5VS91Y2c2QjFMY2dtTitpdz09
ID：929 8937 3544
Password：21106

Ming-Feng



On Tue, Feb 21, 2023 at 9:00 AM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
wrote:

> Hi Physics and Astronomy Grads,
>
> We will have our PASS talk *this Wednesday (2/22) at 4 pm*.
>
> *Chris Cain (5th year; PI: Anson D'Aloisio)* will tell us about how to
> constrain the epoch of reionization using his efficient radiative
> transfer code with a novel sub-grid physics model. If you are interested in
> hydrogen and 21-cm signals, please come and join us! :)
>
>
> *Title: Modeling Reionization from Small to Large Scales*
> Chris Cain (University of California, Riverside)
>
> *Abstract:* The Epoch of Reionization (EoR) saw the Intergalactic Medium
> (IGM) transition from being neutral to highly ionized. This process took
> place during the first billion years after the Big Bang and was driven by
> the first generation of HI-ionizing sources, likely the first galaxies.
> Reionization is a complicated process involving a wide range of physical
> scales. The shapes and sizes of ionized regions during the EoR are driven
> by the clustering of galaxies on 100-Mpc scales, while the opacity of the
> intervening IGM is affected by kpc-scale density fluctuations and the
> processes regulating the escape of ionizing photons from galaxies take
> place on even smaller scales. Thus reionization is a challenging problem to
> solve from a theoretical perspective. I will discuss a radiative transfer
> code that I developed that is optimized to solve reionization efficiently
> without sacrificing accuracy. My code uses a novel sub-grid prescription
> for the opacity of the ionized IGM that is built on high-resolution
> simulations that resolve the clumping and dynamics of intergalactic gas
> down to kpc scales. I will also discuss our recent results using this code
> to better understand reionization observables, including the Lya forest,
> the ionizing photon mean free path, and the 21 cm signal from HI during the
> EoR.
>
>
>
> *Wednesday, 2/22, 2023, at 4 pmPhysics 3027 (Nebula Room)*
>
> In case you couldn't come, the meeting will be hybrid:
>
> https://ucr.zoom.us/j/92989373544?pwd=VlUybFJ5VS91Y2c2QjFMY2dtTitpdz09
>  ID：929 8937 3544
> Password：21106
>
> Current speakers for Winter 2022 are in the spreadsheet
> <https://docs.google.com/spreadsheets/d/1xR325pj7zc9jlHSRb7UKDPtRwLuL3hKGxTIeBxi38wo/edit?usp=sharing>
> .
> Next we have ...
>     3/1: Robert Dawson
>     3/8: Archana Aravindan
>     3/15: Wenjun Chang
> ... please stay tuned!
>
>
> About PASS:
> ---
> PASS is a weekly research seminar organized by and for grad students in
> UCR Physics and Astronomy department. The primary purpose of this seminar
> is to create a safe place for grad students to present their research works
> and practice how to ask/answer good questions.
>
> Look forward to seeing you all on Wednesday and discussing IGM!
>
> Ming-Feng
>
> ---
> Ming-Feng Ho
> PhD Student
> Physics and Astronomy, UCR
>
>
>
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