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<font face="Calibri,Helvetica,sans-serif,EmojiFont,Apple Color Emoji,Segoe UI Emoji,NotoColorEmoji,Segoe UI Symbol,Android Emoji,EmojiSymbols" size="2"><span style="font-size: 16px;"><font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;">Dear
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<font face="Calibri,Helvetica,sans-serif,EmojiFont,Apple Color Emoji,Segoe UI Emoji,NotoColorEmoji,Segoe UI Symbol,Android Emoji,EmojiSymbols" size="2"><span style="font-size: 16px;"><font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="3" color="#212121"><span style="font-size: 12pt;">our
next EO meeting will take place this Thursday May 16 at 13:15 in the KTH meeting room on the 5th floor.</span></font><font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="3" color="#212121"><span style="font-size: 12pt;"> </span></font></span></font></div>
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<p><span style="color: rgb(33, 33, 33); font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif, serif, EmojiFont; font-size: 15px;"><b>Danny Goldstein</b> from Caltech will present us the following talk</span><br>
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<div style="margin: 0px;">Title: Time-Domain Approaches to Investigating the Tension in H0</div>
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<div style="margin: 0px;">Abstract: State-of-the-art local and primordial measurements of the Hubble constant (H0) are currently in tension at the 4.4 sigma level. New physics and systematic errors have been invoked as potential explanations. I will discuss
two new, independent techniques for measuring H0 from time-domain astronomy that can help distinguish between these and other scenarios. The first is to use time delays from strongly gravitationally lensed supernovae to constrain H0 geometrically. The second
is to construct a distance-redshift relation using electromagnetic counterparts to gravitational wave events. I will describe experimental efforts that are currently underway to carry out both of these measurements, namely the Zwicky Transient Facility lensed
supernova search and the Dark Energy Camera neutron star merger follow-up program. </div>
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<p style="font-size:16px; font-family:Calibri,Helvetica,sans-serif">---------------------------------</p>
<p style="font-size:16px; font-family:Calibri,Helvetica,sans-serif">André da Silva Schneider<br>
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<p style="font-size:16px; font-family:Calibri,Helvetica,sans-serif"><span style="font-size:10pt; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont">Department of Astronomy</span><br>
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<p style="font-size:16px; font-family:Calibri,Helvetica,sans-serif"><span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="font-size:10pt">Stockholm University</span></span></p>
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