#  ITC Seminar - Julian Munoz (Harvard Physics)  

 



####  calendar\_today Date and Time 

 **February 11, 2020** 

 12:00PM - 01:00PM EST 

####  pin\_drop Location 

 **Phillips**  



 

 



 

 "Learning Cosmology with the First Stars"

 I will describe how upcoming 21-cm measurements during cosmic dawn will provide a trove of new cosmological information. This era saw the formation of the first stars, which excited neutral hydrogen and allowed it to absorb 21-cm photons from the CMB. The timing of this signal carries information on the abundance of the small mini-halos that hosted the first stars, allowing us to probe the matter power spectrum at smaller scales than currently possible. Moreover, I will describe how the relative velocities between dark matter and baryons are imprinted onto the 21-cm power spectrum during cosmic dawn, resulting in robust velocity-induced acoustic oscillations (VAOs). These act as a new standard ruler at z=20, opening up searches for the early dark energy argued to resolve the H0 tension.



 

 



 

 See also:- [ 2019 - 20 ](/academic-year/2019-20)
- [ Seminars ](/event-type/seminars)
 
 

 Share on:- [     Facebook ](#)
- [     Twitter ](#)
- [     Linkedin ](#)
 


 Save: [ Add to calendar calendar\_today ](https://itc.cfa.harvard.edu/node/1272866/event-feed.ics)  Copy link link