-
Yoshiko Ogata (Kyoto University)11/16/26, 11:30 AM
We establish a direct connection between the entanglement bootstrap
Go to contribution page
and the Doplicher--Haag--Roberts theory of superselection sectors for
two-dimensional
quantum spin systems. Under the entanglement-bootstrap assumptions, we prove
Haag duality and establish a one-to-one correspondence between simple
entanglement-bootstrap anyon types and irreducible superselection sectors. For
each... -
Edoardo D'Angelo (Leibniz Universität Hannover)11/16/26, 2:30 PM
-
Daine Danielson (MIT and Harvard)11/16/26, 4:00 PM
We review several recent developments in the study of decoherence in the vicinity of black holes. In particular, we show that any quantum system in the vicinity of a black hole or cosmological horizon obeys a "second law" of nondecreasing decoherence, due to the presence of the horizon. In studying this phenomenon, we also develop a general formula for the relative Tomita operator between...
Go to contribution page -
Giuseppe Di Giulio (Stockholm University)11/16/26, 4:25 PM
Recently, there has been intense research activity on the interplay between symmetries and entanglement, exploiting the block-diagonal structure of the reduced density matrix (RDM) in each charge sector. The goal of this talk is to study how the presence of a global U(1) charge affects the modular operator, a central object in the algebraic description of quantum field theory (QFT). Roughly...
Go to contribution page -
Victor Kac (MIT)11/17/26, 10:30 AM
I will report on my joint work with Paolo Papi and Pierluigi Moseneder Frajria on classification of unitary vertex operator algebras, especially quantum affine W-algebras $W_k(\mathfrak{g},\mathfrak{s})$, where $\mathfrak{g}$ is a simple finite-dimensional Lie (super)algebra, $ \mathfrak{g}$ its $sl_2$ subalgebra, and $k$ a number.
Go to contribution page -
Johanna Erdmenger (Julius Maximilians University Würzburg)11/17/26, 12:00 PM
In AdS/CFT holography, two manifestations of the black hole information paradox are given by the nonisometric nature of the bulk-boundary map and by the factorisation puzzle. By considering time-shifted microstates of the eternal black hole, we demonstrate that both puzzles may be simultaneously resolved by taking into account nonlocal quantum corrections that correspond to wormholes arising...
Go to contribution page -
Karl-Henning Rehren (Uni Göttingen)11/17/26, 2:30 PM
Entropy considerations (at least morally) require reliable “state counts”.
Canonical quantization of gauge potentials introduces “too many particle
states”. They are eliminated by introducing even more unphysical states
(“ghosts”). In order to prevent confusing state counts, an approach with
the correct number of states from the outset is desirable.I will not address “entropy” any...
Go to contribution page -
Sebastiano Carpi (Università di Roma Tor Vergata)11/17/26, 4:00 PM
Vertex operator algebras (VOAs) provide a precise mathematical framework for the study of chiral conformal field theories (chiral CFTs). They capture the relevant algebraic properties of chiral conformally invariant fields on the circle. Conformal nets provide another well-developed mathematical approach to chiral CFTs, based on the theory of von Neumann algebras on Hilbert spaces. The first...
Go to contribution page -
Klaus Fredenhagen (Universität Hamburg)11/18/26, 10:30 AM
Operations in local quantum physics are required not to induce acausal effects. This leads to a formulation in terms of local interactions. The corresponding framework is well established in relativistic quantum field theory and
can be used for a construction of models.
Go to contribution page -
Simone Del Vecchio (Università degli Studi di Bari Aldo Moro)11/18/26, 12:00 PM
We develop a framework for non-commutative de Finetti theory based on ergodic and factorization properties of quantum stochastic processes.
Go to contribution page
We first establish the non-commutative Hewitt-Savage 0-1 law. We identify the factorization condition of the distribution of a spreadable process which characterizes tail-triviality, which is also characterized dynamically in terms of a certain... -
Yasuyuki Kawahigashi (University of Tokyo)11/18/26, 2:30 PM
We study 3-tensors satisfying the "zipper condition", which play an important role in tensor network approaches to two-dimensional topological order. We identified the 4-tensors appearing in these approaches with bi-unitary connections in the Jones theory of subfactors in operator algebras before. We now prove that, when the bi-unitary connection produces a subfactor of finite depth, the...
Go to contribution page -
Thomas Faulkner (UIUC)11/18/26, 4:00 PM
I will present proofs of two extensions of the quantum null energy condition; formulated as convexity of relative entropy along a one parameter family of vN algebras generated by a half-sided modular inclusion (HSMI). The first generalizes the relative entropy reference vacuum state to a weight, as in Araki-Zsido’s extension of the HSMI structure. The second replaces relative entropy with...
Go to contribution page -
Gandalf Lechner (FAU Erlangen)11/19/26, 10:30 AM
-
Luca Giorgetti (University of Rome Tor Vergata)11/19/26, 12:00 PM
Invertible symmetries are typically described by automorphisms and arise in groups. Non-invertible symmetries have also attracted much attention in quantum field theory in recent years. We review our work, joint with M. Bischoff and S. Del Vecchio, on non-invertible symmetries (also called quantum operations) in the special case of chiral conformal field theories, within the operator algebraic...
Go to contribution page -
David Kyed (University of Southern Denmark)11/19/26, 2:30 PM
In recent years, substantial progress has been made in understanding the non-commutative metric structure of q-deformations, including the Podleś sphere, quantum SU(2), and quantum projective spaces. After introducing the necessary background, I will survey these developments, with particular emphasis on quantum Gromov–Hausdorff continuity in the deformation parameter.
The talk is based on...
Go to contribution page -
Arnaud Brothier (University of Trieste and UNSW Sydney)11/19/26, 4:00 PM
I will explain how Vaughan Jones's original motivation to construct conformal field theories has led to the development of powerful tools for studying and describing certain spectra of C*-algebras. This talk is based on various joint works with Vaughan Jones, Dilshan Wijesena and Aidan Sims.
Go to contribution page -
Magdalena Musat (University of Copenhagen)11/20/26, 10:30 AM
-
Mikael Rordam (University of Copenhagen)11/20/26, 12:00 PM
-
Netta Engelhardt (MIT)11/23/26, 11:30 AM
-
Pierre Martinetti (Università di Genova & INFN)11/23/26, 2:30 PM
Noncommutative geometry in Connes' framework provides an extension of Riemannian geometry in terms of spectral triples. The latter consists of an algebra acting on a Hilbert space H,
together with an operator D generalising the Dirac operator of quantum field theory. The trace of D, suitably regularised by a test function f, defines the so-called "spectral action", whose relevance is...
Go to contribution page -
Vincenzo Morinelli (University of Rome Tor Vergata)11/23/26, 4:00 PM
Models in Algebraic Quantum Field Theory can be generalized to include Lie group symmetries whose Lie algebras admit an Euler element h, characterized by the property that ad h is diagonalizable with eigenvalues in {−1,0,1}. These elements become relevant to the formal description of wedge localization.
Within the geometric framework established in previous works with K.-H. Neeb and G....
Go to contribution page -
Oliver Waite (University of California, Riverside)11/23/26, 4:25 PM
In this talk I discuss the problem posed by Magan of deriving sharp entropic uncertainty relations from the entropic certainty principle. I introduce a quadratic form measuring the failure of observables to commute with the momentum subalgebra. This gives rise to a flow whose trajectories are operator-valued paths. I show that relative entropy along the induced flow of states converges to the...
Go to contribution page -
Rainer Verch (University of Leipzig)11/24/26, 10:30 AM
-
Viktor Eisler (University of Graz)11/24/26, 12:00 PM
The structure of entanglement in quantum many-body systems is ubiquitously characterized via the modular or entanglement Hamiltonian (EH). For a ground state within 1+1D conformal field theory, the EH is known to be given by a deformation of the physical Hamiltonian. This deformation is linear close to the subsystem boundaries, which is a manifestation of the seminal Bisognano-Wichmann result....
Go to contribution page -
Gerardo Morsella (University of Rome Tor Vergata)11/24/26, 2:30 PM
-
Maria Stella Adamo (Kyoto University)11/24/26, 4:00 PM
-
Paul Fendley (University of Oxford)11/25/26, 10:30 AM
Free fermions are a staple of theoretical physics, both in field theory and on the lattice. The traditional method for expressing bosonic lattice models in terms of them is via a non-linear ``Jordan-Wigner” transformation of the degrees of freedom. If the resulting action/Hamiltonian turns out to be a bilinear in fermions, you’re in luck. Recent years however have seen a more systematic...
Go to contribution page -
Nima Lashkari (Purdue university)11/25/26, 12:00 PM
We introduce and study the subsystem flow of local algebra inclusions comparing a subsystem's intrinsic modular evolution with the one inherited from a larger region in QFT and holography. By analytically continuing subsystem flow, we construct a class of inclusion parent Hamiltonians that allow the subsystem to leave the larger algebra. We show that in highly symmetric cases, these parent...
Go to contribution page -
Kasia Rejzner (University of York)11/25/26, 2:30 PM
-
Lauritz van Luijk (Perimeter Institute for Theoretical Physics / Institute for Quantum Computing, University of Waterloo)11/25/26, 4:00 PM
-
Erik Verlinde (Institute of Physics, University of Amsterdam)11/26/26, 10:30 AM
-
Paolo Palumbo (University of Naples Federico II)11/26/26, 12:00 PM
A generalization for the quantum information retrieval protocol recently illustrated by E. Verlinde and J. van der Heijden for evaporating black holes is provided for inclusions of type III von Neumann factors. The physical interest of such scenario arises in Quantum Field Theory, where local algebras are type III von Neumann algebras. The formula obtained can be easily interpreted in terms of...
Go to contribution page -
Nicola Pinamonti (Università di Genova)11/26/26, 2:30 PM
In this seminar we present the construction of equilibrium states at finite temperature for weakly interacting non-relativistic bosons with a non-trivial background field in infinitely extended space. Utilizing the framework introduced by Araki and further expanded by Fredenhagen and Lindner, we derive the generating function of the correlation functions of the theory as a suitable series. A...
Go to contribution page -
Adriano Chialastri (SISSA)11/26/26, 4:00 PM
The so-called Sorkin's paradox manifests itself in QFT as the apparent presence of superluminal signalling, generating a conflict between the concept of measurement and locality. As a non-local transfer of information, it should have direct consequences for quantities like relative entropy. We analyse this phenomenon in the context of general algebraic QFT, where relative entropy may be quite...
Go to contribution page -
Marco Refuto (University of Naples ''Federico II'' and INFN, Sec. of Naples)11/26/26, 4:25 PM
The most active area of research in quantum-gravity phenomenology investigates the possibility of Planck-scale-modified dispersion relations, focusing mainly on two alternative scenarios: the “LIV" scenario, characterized by a specific mechanism of breakdown of relativistic symmetries, and the “DSR" scenario, which preserves overall relativistic invariance but with deformed laws of...
Go to contribution page -
Christopher Fewster (University of York)11/27/26, 10:30 AM
-
Yoh Tanimoto (Università di Roma Tor Vergata)11/27/26, 12:00 PM
We review the fundamental ideas and known results of the renormalization group approach by Balaban and Dimock, with a particular emphasis on the $\phi^4_3$ model. We present partial results towards the convergence of the partition functions of the $\phi^4_3$ model and discuss briefly possible extensions to other models.
Go to contribution page
Choose timezone
Your profile timezone: