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X-ORIGINAL-URL:https://www.ift.uam-csic.es
X-WR-CALDESC:Events for Instituto de Física Teórica
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DTSTART;TZID=Europe/Madrid:20260422T113000
DTEND;TZID=Europe/Madrid:20260422T123000
DTSTAMP:20260422T052727
CREATED:20260420T064701Z
LAST-MODIFIED:20260420T064701Z
UID:24923-1776857400-1776861000@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'The Quantum Agreement Theorem'
DESCRIPTION:Title: The Quantum Agreement Theorem\n\nSpeaker: María García (upm)\n\nVenue&Time: Gray Room 3 / 11:30\n\nAbstract: We formulate and prove an Agreement Theorem for quantummechanics (QM)\, describing when two\nagents\, represented by separate laboratories\, can or cannot maintain differing probability estimates of\na shared quantum property of interest. Building on the classical framework (Aumann\, 1976)\, we define\nthe modality of “common certainty” through a hierarchy of certainty operators acting on each agent’s\nHilbert space. In the commuting case – when all measurements and event projectors commute – common\ncertainty leads to equality of the agents’ conditional probabilities\, recovering a QM analog of the classical\ntheorem. By contrast\, when non-commuting operators are allowed\, the certainty recursion can stabilize\nwith different probabilities. This yields common certainty of disagreement (CCD) as a distinctive QM\nphenomenon. Agreement is restored once measurement outcomes are recorded in a classical register. The\nclassical Agreement Theorem can therefore be seen as emergent from the quantum world via recording.\nWe establish an impossibility result stating that QM forbids a scenario where one agent is certain that\na property of interest occurs\, and is also certain that the other agent is certain that the property does\nnot occur. In this sense\, QM admits non-classical disagreement\, but disagreement is still bounded in a\ndisciplined way. We argue that our analysis offers a rigorous approach to the longstanding issue of how\nto understand intersubjectivity across agents in QM.
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-the-quantum-agreement-theorem/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
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DTSTART;TZID=Europe/Madrid:20260422T113000
DTEND;TZID=Europe/Madrid:20260422T163000
DTSTAMP:20260422T052727
CREATED:20260413T114758Z
LAST-MODIFIED:20260419T204443Z
UID:24889-1776857400-1776875400@www.ift.uam-csic.es
SUMMARY:Madrid's Polygonal Gravity Seminar Series
DESCRIPTION:Venue&Time: Red Room / 11:30 / 15:00 \nPROGRAM: \n——————— \n11:00 Welcome coffee \n——————— \n11:30h     First Talk \nSpeaker: Jelle Hartong (Edinburgh U.) \nTitle: The Geometry of Gravitational Radiation \nAbstract: This talk concerns asymptotically flat vacuum solutions of GR in\n4 spacetime dimensions. The asymptotics of such metrics is quite intricate\nand depends on how we approach infinity. If we follow null geodesics we\nend up at future null infinity. This is where massless fields\, including\ngravitational radiation ends up. In this talk we will study the metric\nnear future null infinity with an emphasis on geometrical structures that\nemerge in that part of the spacetime. \nFuture null infinity of an asymptotically flat spacetime is a conformal\nCarroll manifold. I will not assume any familiarity with Carroll geometry\nand explain the relevant geometrical notions as we go along. We will\nconsider asymptotic solutions to the 4D vacuum Einstein equations where\nfuture null infinity is endowed with the most general Carroll metric data\nthat is allowed by the Einstein equations. This can be used to define an\nenergy-momentum tensor (EMT) at future null infinity by varying a suitably\nrenormalised action with respect to the boundary Carroll metric data. It\nis shown that the Ward identities obeyed by this boundary EMT agree with\nthe Bondi loss equations that describe the loss of energy and momentum due\nto the emission of gravitational waves. The metric near future null\ninfinity can be formulated in terms of a Cartan geometry based on the\nconformal Carroll algebra. The non-vanishing curvatures of said algebra\ndictate how radiative the spacetime is. For example\, the vacuum degeneracy\nis described by a flat conformal Carroll connection. We will see that the\nBondi loss equations can be rewritten as flux-balance laws where the\nfluxes are determined by the Cartan geometry for the conformal Carroll\nalgebra. \n——————– \n15:00h     Second Talk \nSpeaker: Eric A. Bergshoeff (U. of Groningen) \nTitle: Massive gravity in the lab \nAbstract: In this talk I will discuss a connection between the so-called\nchiral massive GMP spin-2 mode in the Fractional Quantum Hall effect and a\nthree-dimensional (one time and two space) relativistic massive spin-2\nfield in quantum field theory. In particular\, I will show how the spin-2\nGMP mode follows by taking a special non-relativistic limit of linearized\nthree-dimensional massive gravity which are the planar Fierz-Pauli\nequations. I will discuss how these results can be generalized to integer\nhigher-spins and will present results for half-integer spins as well. \n——————– \n16:15  Farewell coffee \n—————————————————————————– \nMore information about these and following monthly seminars can be found at the\nwebpage \nhttps://sites.google.com/view/polygrav \nWe very much hope to see you there! (No registration is needed) \nFernando Barbero (IEM)\, Guillermo Mena (IEM)\, Luis Garay (UCM)\,\nMercedes Martin-Benito (UCM)\, Daniele Oriti (UCM)\, Tomas Ortin(IFT)\, Francesca\nVidotto (IEM)\, Eduardo Villaseñor (UC3M)
URL:https://www.ift.uam-csic.es/event/madrids-polygonal-gravity-seminar-series-2/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
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