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

[Pooyan Goodarzi]

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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