[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]

Happening in 5 mins! We provide some snacks this week- I grabbed some from
the coffee social.

Ming-Feng


On Wed, Feb 22, 2023 at 3:29 PM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
wrote:

> 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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