[Physics-grads-open] The last PASS talk of the quarter

[Pooyan Goodarzi]

Reminder: Happening in ~1 hour.
The talk will also be accessible via Zoom at:

https://ucr.zoom.us/j/98031800284?pwd=bE7FNGUExUFouVpj9rbhzM4bSH9dTS.1


On Sun, Dec 15, 2024 at 19:46 Pooyan Goodarzi <pooyan.goodarzi at email.ucr.edu>
wrote:

> Hi all,
>
> We will have our last PASS talk of the quarter tomorrow. Please join us
> at noon (from 12:00 pm to 1:00 pm) in the Nebula Room (PHYS 3027).
>
>
> Yash Aggarwal, PhD student
>
> Monday, 12:00 pm, Nebula Room (PHYS 3027)
> Constraining Axion-Like Particles Using Direct Collapse Black Holes.
>
>
> Cosmic Dawn is the new pathway for Dark Matter indirect detection. During
> this era, axion-like particles may decay into sub-Lyman limit photons with
> energies ranging from 0.75 eV to 13.6 eV. These photons efficiently
> suppress and dissociate molecular hydrogen (H₂), the primary coolant for
> first star-forming halos. Without molecular coolants, halos reaching the
> 10⁴ K threshold can only cool via atomic hydrogen, and are driven towards
> the formation of Direct Collapse Black Holes (DCBHs). We demonstrate that
> sufficient axion decay pushes halos along the DCBH route globally, thereby
> presenting a part of parameter space that must be excluded to maintain
> consistency with the observed Universe.
>
>
> If you’re interested in sharing your work as a speaker, please feel free
> to add your name to this spreadsheet [Google Sheet
> <https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing>
> ].
>
> Best,
> Pooyan
> Physics and Astronomy Student Seminar (PASS)
>
>
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