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Dear All,</div>
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We have a seminar this week. The details are provided below.</div>
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Kind regards, </div>
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Elisa</div>
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<b>Speaker:</b> Benjamin Muntz (Nottingham)</div>
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<b>Seminar date:</b> November 18th <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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<b>Title: <i>On the Geometry of Gravitational Effective Field Theories</i></b></div>
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<b>Abstract: </b>Field space geometries — defined via the kinetic sector of an Effective Field Theory (EFT) — have recently become central to questions in swampland, amplitudes, cosmology, and philosophy of physics. When the EFT couples to gravity, however,
the status of this geometry becomes ambiguous: the field space metric transforms non-trivially under Weyl transformations, obscuring how geometry behaves covariantly across otherwise equivalent conformal frames.</div>
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In this talk I present a new framework to resolve this ambiguity. I will explain how all possible conformal frames arise as different foliations of a particular higher-dimensional geometry. With the help of ADM, statements like frame- and unit transformations,
as well as field excursions, receive a clean reinterpretation in differential-geometric language. This perspective also reveals precisely how gravity itself curves field space.</div>
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Time permitting, I will illustrate two applications of our formalism:</div>
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<div role="presentation" class="elementToProof">First, I will prove the Species Scale Distance Conjecture and Sharpened Distance Conjecture, and argue that these are in fact universal statements of scalar-tensor theories rather than having to do with quantum
gravity.</div>
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<div role="presentation" class="elementToProof">Second, I will show how to quickly calculate scattering amplitudes in Higgs inflation. What is otherwise a lengthy derivation now boils down to computing just a single field space Riemann tensor.</div>
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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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Nov 25th: Fraser Cowie (Oxford)</div>
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Dec 2nd: Violetta Sagun (Southampton)</div>
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Dec 9th: James Alvey (Cambridge)</div>
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