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DTSTART;TZID=Europe/Paris:20210927T080000
DTEND;TZID=Europe/Paris:20210927T090000
DTSTAMP:20260411T010406
CREATED:20220620T163008Z
LAST-MODIFIED:20220620T163008Z
UID:7851-1632729600-1632733200@www.lapth.cnrs.fr
SUMMARY:Journée CPTGA
DESCRIPTION:See webpage \nhttps://indico.in2p3.fr/event/24592/
URL:https://www.lapth.cnrs.fr/en/event/journee-cptga/
CATEGORIES:Weekly seminars
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210708T110000
DTEND;TZID=Europe/Paris:20210708T120000
DTSTAMP:20260411T010406
CREATED:20220620T163008Z
LAST-MODIFIED:20220620T163008Z
UID:7850-1625742000-1625745600@www.lapth.cnrs.fr
SUMMARY:Modern methods for scattering amplitudes\, with an application to di-photon plus jet production at two-loop order in QCD (remote talk)
DESCRIPTION:Scattering amplitudes play a central role in our understanding of the fundamental laws of nature. On the one hand they constitute the bridge between theory and experiments\, allowing to compute predictions starting from a theoretical model. On the other\, they shed light on the underlying properties of quantum field theories. To both ends\, analytic results for multi-particle multi-loop amplitudes are in high demand. In particular\, the foremost and most urgent challenge is currently represented by five-particle amplitudes at two-loop order. Despite the dramatic recent progress\, such computations remain formidable tasks. I review the cutting edge mathematical methods used in the analytic calculation of scattering amplitudes. As an application\, I present the recent computation of the gluon-initiated contribution to di-photon plus jet production up to two loops in QCD.
URL:https://www.lapth.cnrs.fr/en/event/modern-methods-for-scattering-amplitudes-with-an-application-to-di-photon-plus-jet-production-at-two-loop-order-in-qcd-remote-talk/
CATEGORIES:Weekly seminars
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210624T110000
DTEND;TZID=Europe/Paris:20210624T120000
DTSTAMP:20260411T010406
CREATED:20220620T163008Z
LAST-MODIFIED:20220620T163008Z
UID:7849-1624532400-1624536000@www.lapth.cnrs.fr
SUMMARY:Detached high-mass X-ray binaries : mass transfer and coupling to the magnetosphere
DESCRIPTION:Once massive stars leave the main sequence\, their evolution is largely set by mass loss through intense radiation-driven winds. Stellar multiplicity has been recognized as a ubiquitous feature: stars seldom live an effectively single life. In the advanced evolutionary stages of a massive binary\, mass transfer via stellar winds can become significant and decide the final fate of both bodies. In high mass X-ray binaries (HMXBs)\, which are good progenitor candidates for merging compact objects\, a blue supergiant is in close orbit with a a young and highly magnetized neutron star (NS) or a black hole (BH) which captures a fraction of the stellar wind. \nIn this talk\, I will show how the numerical tool grants us access to accurate estimates of the mass and angular momentum transfer rates in wind-fed HMXBs. After describing the conditions of formation of wind-captured disks around the NS or the BH\, I will discuss the long term evolution of the orbital separation. We will see that HMXBs in the solar neighbourhood spend a significant fraction of their lifetime with an X-ray luminosity above detectable levels. I will present the implications for phases of enhanced mass transfer\, for the spinning up and down of the accretor and for the natal kick of the compact object. Finally\, I will report on recent results concerning particle acceleration in the magnetosphere of a Kerr BH connected to a Keplerian disk\, a mechanism which might be responsible for coronal heating and non-thermal flares. \n– – – \nAfter a seminal research experience with Saul Rappaport at MIT in 2011-2012\, I graduated in Paris in 2016. During my PhD\, I made use of grid-based numerical simulations to characterize the flow surrounding an accreting compact object moving with respect to an ambient medium. In Leuven\, I was granted a Pegasus Marie Curie fellowship to model mass transfer through wind capture in high-mass X-ray binaries. I moved to Grenoble in October this year where I now work with Benoît Cerutti on particle-in-cell simulations of magnetic reconnection in the magnetosphere of black holes.
URL:https://www.lapth.cnrs.fr/en/event/detached-high-mass-x-ray-binaries-mass-transfer-and-coupling-to-the-magnetosphere/
CATEGORIES:Weekly seminars
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