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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:26.0pt;font-family:"Times New Roman",serif;color:#006FC0">Physics & Astronomy Colloquium</span></b></span><o:p></o:p></p>
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</span><i><span style="font-size:26.0pt;font-family:"Times New Roman",serif">Cosmic Reionization: When, How, and Who?</span></i><o:p></o:p></p>
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<span class="m-642861739458883080scxw113168724"><span style="font-size:11.0pt"> </span></span><span style="font-size:11.0pt"><br>
</span><span class="m-642861739458883080normaltextrun"><b><i><span style="font-size:28.0pt;font-family:"Times New Roman",serif">Dr. Adam Lidz</span></i></b></span><o:p></o:p></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:28.0pt;font-family:"Times New Roman",serif">University of Pennsylvania</span></b></span><o:p></o:p></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif">Abstract: An exciting and largely unexplored frontier in observational and theoretical cosmology is to understand the properties of the universe between 400,000 years and one billion years after
the big bang. Notably, the first galaxies formed in this time period, perhaps a few hundred million years after the big bang. These galaxies strongly influenced the gas in their surroundings, as well as the formation of subsequent generations of galaxies.
The early galaxies emitted ultraviolet light and ionized "bubbles" of hydrogen gas around them. These ionized bubbles grew, merged, and eventually filled the entire volume of the universe with ionized hydrogen, in a process known as reionization. Understanding
this process will constrain the properties of the first luminous sources, and fill in a significant gap in our story of structure formation, whereby the universe transitions from simple initial conditions to its present day complexity. I will discuss what
we know about reionization from current observations and give some thoughts regarding how to learn more from a diverse set of upcoming observations including: cosmic microwave background, galaxy survey, redshifted 21 cm, and line-intensity mapping data sets.</span><o:p></o:p></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif;color:#2F5496">Thursday, May 25th, 2023</span></b></span><o:p></o:p></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif;color:#2F5496">3:40 PM in Winston Chung Hall (Room 138)</span></b></span><o:p></o:p></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif;color:#2F5496">Coffee will be served at 3:10 PM in the Barkas Lounge (3049 Physics)</span></b></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Heather McDermott</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Travel & Event Coordinator</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Physics & Astronomy Dept.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">University of California Riverside</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ph: 951-827-6169</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><a href="mailto:heatherm@ucr.edu"><span style="color:#0563C1">heatherm@ucr.edu</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Tahoma",sans-serif;color:red;text-transform:uppercase;letter-spacing:2.0pt">AVAILABLE VIA ZOOM </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Tahoma",sans-serif;color:red;text-transform:uppercase;letter-spacing:2.0pt">FOR VIRTUAL OFFICE </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Tahoma",sans-serif;color:red;text-transform:uppercase;letter-spacing:2.0pt">HOURS AT:</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#232333;background:white"><a href="https://ucr.zoom.us/my/heathermcdermott" title="https://ucr.zoom.us/my/heathermcdermott"><span style="color:#0563C1">https://ucr.zoom.us/my/heathermcdermott</span></a></span><o:p></o:p></p>
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