[Physics-grads-open] Physics & Astronomy Student Seminar (PASS), 1/20 (Fri) at 4 pm: Yash Aggarwal, Nebula Room (Physics 3027)

[Ming-Feng Ho]

Upon the request by Yash, we will make the talk hybrid.

1. In-person: Physics 3027
2. Virtual: Zoom link below

Subject：PASS - Yash Aggarwal
Time：2023/1/20 04:00 pm PST

Join zoom ~~
https://ucr.zoom.us/j/95117955855?pwd=N2pReHNzeTBMbzJmWTM1QUs2akpMQT09

ID：951 1795 5855
Password：1216

Ming-Feng



On Fri, Jan 20, 2023 at 3:10 PM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
wrote:

> Yash's talk will happen in ~50 mins (4 pm in Physics 3027)!
>
> Ming-Feng
>
>
> On Wed, Jan 18, 2023 at 5:08 PM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
> wrote:
>
>> Hi Physics and Astronomy Grads,
>>
>> We are happy to announce resuming the Physics & Astronomy Student Seminar
>> (PASS website
>> <https://jibancat.github.io/ucr-student-seminars/program/index.html>)
>> for Winter 2023!
>>
>> Yash Aggarwal (4th year; PI: Flip Tanedo, Anson D'Aloisio) will talk
>> about his research on dark matter and direct collapse black holes. For
>> people who are interested in high-energy theory, reionization or black
>> holes, please come join us!
>>
>> *Title: Impact of Dark Matter annihilation to UV photons on Cosmic
>> Recombination and First Stars*
>> Yash Aggarwal (University of California, Riverside)
>>
>> *Abstract:* WIMP-like Dark Matter particles are still the most promising
>> candidates for the invisible matter. In a segment of these models, Dark
>> Matter annihilates to a large multiplicity of soft Standard Model
>> particles, which may have vastly different cosmological implications than
>> the commonly studied s-wave annihilation. In this talk, we consider
>> WIMP-like Dark Matter that annihilates to UV photons between 10-15 eV, the
>> energy range to which most atoms and molecules are sensitive. We study the
>> implications of this energy injection on Cosmic Recombination and the first
>> star-forming Halos. We find that perturbations to Cosmic Recombination are
>> sensitive to the annihilation spectrum, and they can be measured by Planck.
>> We also find that Dark Matter annihilation can alter the dynamics of first
>> star-forming halos, enough to lead to a runaway collapse of gases into a
>> Black Hole, a scenario called Direct Collapse Black Holes.
>>
>> *Friday, 1/20, 2023, at 4pm*
>> *Physics 3027 (Nebula Room)*
>>
>> 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, at the same time, practice how to ask/answer good questions
>>
>> Due to speakers' availability, we will switch to every Wednesday at 4 pm
>> starting next week. We have yet to decide on the speaker for next week. So
>> stay tuned!
>>
>> Current pending speakers for Winter 2022 are in the spreadsheet
>> <https://docs.google.com/spreadsheets/d/1xR325pj7zc9jlHSRb7UKDPtRwLuL3hKGxTIeBxi38wo/edit?usp=sharing>
>> .
>>
>> Look forward to seeing you all on Friday!
>> Ming-Feng
>>
>>
>>
>>
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