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X-ORIGINAL-URL:https://web-f1.ijs.si
X-WR-CALDESC:Events for Department of Theoretical Physics
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TZID:Europe/Ljubljana
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TZOFFSETFROM:+0100
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DTSTART:20260329T010000
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DTSTART:20261025T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20260122T110000
DTEND;TZID=Europe/Ljubljana:20260122T120000
DTSTAMP:20260422T050013
CREATED:20251202T145925Z
LAST-MODIFIED:20260122T102113Z
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SUMMARY:Sofie Martins: Computing cross-sections from the lattice — A recent shift in lattice thinking paradigms?
DESCRIPTION:Extracting scattering amplitudes — and consequently cross-sections — from non-perturbative lattice techniques has seen significant advances in recent years. People have so far relied on Luescher’s method\, which relates Euclidean finite-volume effects of lattice correlators to infinite-volume Minkowskian Scattering Amplitudes. While this method has achieved enormous success\, its limitations are somewhat discouraging: the invalidity beyond the inelastic threshold limits predictions to lower-point exclusive particle-scattering processes. New lattice methods by Hansen/Bulava and Tantalo/Patella have addressed this by rethinking the computation of scattering amplitudes on the lattice in terms of spectral densities\, which we can extract from large lattices with increasing precision. These methods allow the examination of exclusive processes even above the inelastic threshold and are consequently an invaluable tool for comparing and complementing perturbative computations with lattice results.I will present preliminary results for the Hansen/Bulava method in a particularly tractable theory that models a gauge-invariant implementation of the electroweak sector.\nhttps://indico.ijs.si/event/3407/
URL:https://web-f1.ijs.si/event/sofie-martins-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5)
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DTSTART;TZID=Europe/Ljubljana:20260122T130000
DTEND;TZID=Europe/Ljubljana:20260122T140000
DTSTAMP:20260422T050013
CREATED:20251218T142803Z
LAST-MODIFIED:20260122T115550Z
UID:82104-1769086800-1769090400@web-f1.ijs.si
SUMMARY:Leah Rank\, "Hollow microgels: From single particle characterisation to bulk behaviour"
DESCRIPTION:Hollow microgels are elastic polymer shells easily realisable in experiments. Recent works have shown the emergence of buckling events in dilute hollow microgels under the effect of an added osmotic pressure. Here\, we perform large-scale simulations to show that these microgels at high enough packing fractions undergo spontaneous symmetry-breaking deformations ranging from single large dents to multiple indentations\, even in the absence of any externally applied stress. This self-induced buckling phenomenon is thus solely driven by interparticle crowding. We construct a phase diagram inspired by vesicle shape theories\, mapping local curvature metrics as a function of the reduced volume\, to quantify these findings\, and we also propose ways to observe the occurrence of buckling in experiments. The present results thus rationalize the deformations occurring in suspensions of micro- and nano-scale elastic shells\, offering a synthetic analogue to biological ones and allowing direct control on buckling instabilities for potential applications. Beyond materials design\, these insights may also help to describe shape regulation in natural systems such as cells and vesicles\, where similar deformations are observed.\nhttps://indico.ijs.si/event/3442/
URL:https://web-f1.ijs.si/event/lear-rank-tba/
LOCATION:A/1-106 – Seminarska soba fizike (F5) (Jamova)
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