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

[Ming-Feng Ho]

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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