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<span class="elementToProof">Dear All,</span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"> </span><span style="line-height: 1.38;" class="elementToProof">We have a seminar this week, whose details are provided below - </span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof">-----------------------------------------</span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"><b>Speaker: George Efstathiou</b> (Cambridge)</span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"><b>Seminar date:</b> <b>24th Feb, Tuesday, 1 pm </b>
UK time</span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"><b>Venue:</b> Seminar Room <b>A 113 (Cripps North Building, CAPT)</b></span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"><b>Title: The Evidence for Dynamical Dark Energy</b></span></div>
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<b><br>
</b></div>
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<b><br>
</b></div>
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<span class="elementToProof"><b>Abstract</b>: </span></div>
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<br>
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<span class="elementToProof">The Dark Energy Spectroscopic Instrument (DESI) collaboration has</span></div>
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<span class="elementToProof">measured baryon acoustic oscillation (BAO) features over a wide range</span></div>
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<span class="elementToProof">of redshifts with unprecedented precision. They argue that the data</span></div>
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<span class="elementToProof">provide evidence for evolving dark energy, quoting 'significance'</span></div>
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<span class="elementToProof">levels of 2.5-4.5 sigma depending on which additional data (CMB</span></div>
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<span class="elementToProof">anisotropies and supernovae) are added to the BAO data. The favoured</span></div>
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<span class="elementToProof">model of dynamical dark energy is unusual, requiring phantom-like</span></div>
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<span class="elementToProof">behaviour at high redshift. I will present a different way of looking</span></div>
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<span class="elementToProof">at the DESI data that provides simple and robust tests of consistency</span></div>
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<span class="elementToProof">with the LCDM cosmology. I find no evidence for a deviation from LCDM</span></div>
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<span class="elementToProof">and my analysis explains the degeneracy direction in the w_0-w_a plane</span></div>
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<span class="elementToProof">found by the DESI collaborations. I will summarize some recent work on</span></div>
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<span class="elementToProof">type Ia Supernova (SN) that supports my earlier claims that SN</span></div>
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<span class="elementToProof">catalogues are not yet accurate enough to constrain models of</span></div>
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<span class="elementToProof">dynamical dark energy. </span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof">--------------------------------------------------</span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"><b>Link to join:</b></span></div>
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<span class="elementToProof"> </span></div>
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<span style="color: black;" class="elementToProof"> </span><span style="color: rgb(5, 99, 193);" class="elementToProof"><u><a style="color: rgb(5, 99, 193); margin: 0px;" data-auth="NotApplicable" data-linkindex="2" title="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d" class="OWAAutoLink" id="OWA61c404db-f378-da85-a2d8-eff7a93b96e5" href="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d">https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d</a></u></span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof"><b><i>List of the following </i></b></span><b><i>four
</i></b><span class="elementToProof"><b><i>upcoming seminars (not everyone has given us a title yet):</i></b></span></div>
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<span class="elementToProof"> </span></div>
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<span class="elementToProof">3-Mar <b>Jon Butterworth</b> (UCL) Future-proofing measurements to probe the energy frontier</span></div>
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<span class="elementToProof">10-Mar <b>Basudeb Dasgupta</b> (</span><span style="font-weight: 500;" class="elementToProof">Tata Inst., Mumbai, India</span><span class="elementToProof">) (ONLINE) Probing Dark Matter with Gravitational Waves from Mergers</span></div>
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<span class="elementToProof">17-Mar <b>Miguel Montero</b> (IFT,Madrid)</span></div>
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<span class="elementToProof">24-Mar <b>Sofie Ried</b> (Sheffield) Unimodular time in quantum gravity</span></div>
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<span class="elementToProof"><b>Finally the full list can be found here:</b></span></div>
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<span class="elementToProof"><a style="margin: 0px;" data-auth="NotApplicable" data-linkindex="3" title="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" class="OWAAutoLink" id="OWAb0213194-47f0-6985-4bdd-d100f8c58a3e" href="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx">https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx</a></span></div>
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<span class="elementToProof">Please let us know if you would like to chat with the speaker and we will arrange for that. </span></div>
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<span class="elementToProof">Best wishes,</span></div>
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<span class="elementToProof">Ed and Qi-Xin</span></div>
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