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Dear All,</div>
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We have a seminar this week whose details are provided below.</div>
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<span style="color: black;"><b>Speaker:</b> <b>Kieran Wood </b>(</span><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><b>Nottingham</b></span><span style="color: black;">)</span></div>
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<b>Seminar date:</b> <b>April 15<sup>th</sup></b> <b>, Tuesday, 1 pm </b>UK time</div>
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<b>Venue:</b> Seminar Room <b>A 113 (Cripps North Building, CAPT)</b></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;"><b>Title:
<i>How to build a dimension</i></b></span></p>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", -apple-system, "system-ui", Roboto, "Helvetica Neue", sans-serif; font-size: 12pt; color: black;"><b>Abstract: </b></span><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;">In
this talk, I will aim to shed new light on an old question, namely: “what does gravitational physics in an additional compact dimension look like to a lower dimensional observer?” Kaluza-Klein tells us that we should expect to see (infinite) towers of massive
spin-2 fields; more recently, theories involving exactly these kinds of fields - so-called multi-gravity theories - have undergone a resurgence, thanks to many interesting theoretical and phenomenological developments. These ideas are related: multi-gravity
can be thought of as arising from higher dimensional GR upon discretising the extra dimension, although the strict correspondence between the two theories only holds when one does this *after* gauge fixing the higher dimensional lapse function. The lapse provides
crucial structure to higher dimensional GR: it ensures full diffeomorphism invariance and enforces the Hamiltonian constraint. Thus, upon deconstruction, important information related to the extra dimension is missing in the resulting multi-gravity theory;
consequently, one could never hope to recover GR in its entirety upon taking the appropriate continuum limit. Here, I develop an improved deconstruction procedure that maintains the free lapse, and show that the correct deconstructed theory should actually
be multi-gravity equipped with additional dynamical scalar fields, whose field equations encode the higher dimensional Hamiltonian constraint. I use the example of Randall-Sundrum brane cosmology to demonstrate this correspondence explicitly. This opens up
a number of interesting avenues for studies of new, viable theories of modified gravity, and potentially a means to probe higher dimensional physics through a lower dimensional lens.</span></p>
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<b>Link to join:</b></div>
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<b><i><u>List of upcoming Seminars:</u></i></b></div>
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15th April: Kieran Wood (Nottingham)</div>
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22nd April: TBD</div>
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29th April: Daniel Panizo (Kyoto U)</div>
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6th May: Ameek Malhotra (Swansea)</div>
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13th May: David Trestini (Southampton)</div>
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With Regards,</div>
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-Elisa & Swagat</div>
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<span style="font-size: 10pt; color: rgb(68, 68, 68); line-height: normal;"><b>Swagat Saurav Mishra</b></span><span style="font-size: 10pt; line-height: normal;">,</span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">Postdoctoral Research Associate</span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;"></span><span style="font-size: 11pt; color: rgb(32, 18, 77); line-height: normal;"><br>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">Particle Cosmology Group, </span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">Centre for Astronomy and Particle Theory,</span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">University of Nottingham, Nottingham NG7 2RD, UK.</span></p>
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<span style="font-size: 10pt; color: rgb(0, 0, 0); line-height: normal;">Website</span><span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">:
</span><span style="font-size: 10pt; color: rgb(17, 85, 204); line-height: normal;"><a href="https://swagatam18.wordpress.com/" target="_blank" id="OWA5213bff4-cef9-75ec-3a4f-1c2fa01322e3" class="OWAAutoLink" style="color: rgb(17, 85, 204); margin-top: 0px; margin-bottom: 0px;">https://swagatam18.wordpress.com/</a></span><span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;"> </span></p>
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<span style="font-size: 10pt; color: rgb(0, 0, 0); line-height: normal;">Research Link</span><span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">:</span><span style="font-size: 10pt; color: rgb(17, 85, 204); line-height: normal;"><a href="https://inspirehep.net/authors/1517353" target="_blank" id="OWAb3e32501-ab5b-5ba8-901b-b4ebde782b95" class="OWAAutoLink" style="color: rgb(17, 85, 204); margin-top: 0px; margin-bottom: 0px;">https://inspirehep.net/authors/1517353</a></span></p>
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