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Dear All,</div>
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<span style="line-height: 1.38;">We have a seminar and an extra whiteboard talk this week, whose details are provided below - </span></div>
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<b>Speaker: David Seery</b> (Sussex)</div>
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<b>Seminar date:</b> <b>17th Feb, 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: The probability of rare fluctuations during inflation with stochastic instantons</b></div>
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<b>Abstract</b>: </div>
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In this talk, I will review why there has been recent interest in calculating the probability of extreme density perturbations produced during an inflationary phase, and briefly discuss the means by which such probabilities have been computed to date. I will
the introduce a new approach, based on the use of "stochastic instantons". Such instantons have been widely applied in many other areas of physics, including turbulent fluid flow, reaction kinetics, climate modelling, and protein folding. The method has a
number of advantages, including giving a spacetime picture for the assembly of a rare, extreme fluctuation. I will show how the method reproduces some known results, but can also be applied to scenarios that were not previously accessible.</div>
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<b>Speaker: Sadra Jazayeri</b> (Imperial)</div>
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<b>Seminar date:</b> <b>18th Feb, Wednesday, 1.30-3.00 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: Zooming Into the Ultraviolet with Primordial Features</b></div>
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<b>Abstract:</b></div>
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In the next few years, galaxy surveys like Euclid and DESI are anticipated to improve the current CMB-driven bounds on primordial features in the power spectrum by roughly an order of magnitude (e.g. 1906.08758). Motivated by this observational prospect, I
show that massive sectors during inflation, with energy scales parametrically larger than the Hubble rate, can leave characteristic scale-breaking signatures in primordial non-Gaussianity, in the presence of non-shift-symmetric couplings to the inflaton sector.
As a benchmark example, I will consider sinusoidal modulations of the species masses, as in axion monodromy scenarios, which would trigger particle productions with exponentially larger rates than the Boltzmann-suppressed case in pure de Sitter. In these models,
without a closed-form solution for the free massive theory, finding analytic templates using the in-in formalism for exchange processes that contribute to primordial non-Gaussianity(PNG) is a formidable challenge. Circumventing the complexity of the corresponding
in-in time integrals, I will build a novel bootstrap framework in which the exchange diagrams contributing to PNG can be solved using a set of integro-differential equations on the boundary implied by locality in the bulk of spacetime. </div>
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Note added: This is going to be a very informal white/black board talk based on the recent work 2511.00152. </div>
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<b>Link to join:</b></div>
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<span style="color: black;"> </span><span style="color: rgb(5, 99, 193);"><u><a style="color: rgb(5, 99, 193); margin: 0px;" data-linkindex="0" data-auth="NotApplicable" rel="noopener noreferrer" 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="OWA6af76e6a-075c-a157-ed7c-4f51b0ca40d9" target="_blank" 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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<b><i>List of the following five upcoming seminars (not everyone has given us a title yet):</i></b></div>
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24-Feb <b>George Efstathiou</b> (Cambridge) The Evidence for Dynamical Dark Energy</div>
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3-Mar <b>Jon Butterworth</b> (UCL) Future-proofing measurements to probe the energy frontier</div>
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10-Mar <b>Basudeb Dasgupta</b> (<span style="font-weight: 500;">Tata Inst., Mumbai, India</span>) (ONLINE) Probing Dark Matter with Gravitational Waves from Mergers</div>
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17-Mar <b>Miguel Montero</b> (IFT,Madrid)</div>
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24-Mar <b>Sofie Ried</b> (Sheffield) Unimodular time in quantum gravity</div>
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<b>Finally the full list can be found here:</b></div>
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<a style="margin: 0px;" data-linkindex="1" data-auth="NotApplicable" rel="noopener noreferrer" title="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" class="OWAAutoLink" id="OWAea7566f5-97b3-0ed0-ca14-370328c2f308" target="_blank" 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></div>
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Please let us know if you would like to chat with the speaker and we will arrange for that. </div>
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Best wishes,</div>
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Ed and Qi-Xin</div>
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