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Upcoming Seminars [Next 30 ]
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Wednesday 12 December 2018, 10:00 at IHES, Centre de conférences Marilyn et James Simons
( Séminaire de Géométrie Arithmétique Paris-Pékin-Tokyo )
MATH-IHES (TBA) hep-th
Gaëtan Chenevier ( CNRS, Université Paris-Sud ) A higher weight (and automorphic) generalization of the Hermite-Minkowski theorem
Abstract: I will show that for any integer N, there are only finitely many cuspidal algebraic automorphic representations of GL_m over Q whose Artin conductor is N and whose "weights" are in the interval {0,...,23} (with m varying). Via the conjectural yoga between geometric Galois representations (or motives) and algebraic automorphic forms, this statement may be viewed as a generalization of the classical Hermite-Minkowski theorem in algebraic number theory. I will also discuss variants of these results when the base field Q is replaced by an arbitrary number field.

Wednesday 12 December 2018, 11:00 at LPT, 114 LPT-PHYSMATH (Séminaires de Physique-Mathématique du LPT-Orsay) hep-th
Mikhail Isachenkov ( IHES ) All-energy correlation functions in large N double-scaled SYK
Abstract: I will review a method to evaluate correlation functions of certain large N statistical systems via chord diagrams and apply it to compute correlators in double-scaled version of SYK model at all energies, in particular to extract corrections to the maximal chaos exponent. Time permitting, I will comment on the suggested relation of this model to a Hamiltonian reduction of quantum particle moving on a non-compact quantum group SU_q(1,1).

Thursday 13 December 2018, 11:00 at CPHT, Salle de Conference Louis Michel (Bât.6 CPHT) SEM-CPHT (Séminaire du CPHT) hep-th
Carlo Angelantonj ( Turin University ) GUT Scale Unification in Heterotic String
Abstract: I shall present a class of heterotic compactifications where it is possible to lower the string unification scale down to the GUT scale. I shall illustrate this approach with an explicit example of a four-dimensional chiral heterotic vacuum with N=1 supersymmetry.

Thursday 13 December 2018, 11:00 at IPN, Salle A201 IPN-X (Séminaire commun de physique théorique des particules IPN-CPHT-X) hep-ph
Marc Knecht ( Centre de Physique Théorique, Marseille ) Toward a SM prediction for the amplitudes of the rare CP-conserving $K^\pm\to\pi^\pm\ell^+\ell^-$ and $K_S\to\pi^0\ell^+\ell^-$ decays
Abstract: The amplitudes for the rare decay modes $K^\pm\to\pi^\pm\ell^+\ell^-$ and $K_S\to\pi^0\ell^+\ell^-$ are studied with the aim of obtaining predictions for them, such as to enable the possibility to search for violations of lepton-flavour universality in the kaon sector.

Thursday 13 December 2018, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th
Erik Panzer ( Oxford ) Integration with multiple polylogarithms
Abstract: Multiple polylogarithms are generalizations of the classical (poly-)logarithm functions and play an important role in several areas of mathematics. Their special values at one are well-known as multiple zeta values and these form the Drinfeld associator. Polylogarithms arise naturally as iterated integrals on the moduli space of genus zero curves, and their integration theory was worked out explicitly by F. Brown and is completely understood. I will define this class of functions, explain some of their properties, and show how they can be used to compute a certain class of integrals. Applications to Feynman integrals, string amplitudes and deformation quantization will be illustrated.

Thursday 13 December 2018, 14:00 at LPTM, 4.13 St Martin II SEM-LPTM-UCP (Seminaires du LPTM , Universite de Cergy Pontoise) cond-mat
Marcello Civelli ( LPS Université Paris Sud-Paris Saclay ) Competition of gaps and unconventional high-energy Cooper pairing in cuprates: a Cluster Dynamical Mean Field Theory Perspective
Abstract: A most striking feature of high-Tc cuprate superconductors is the persistence of a gap above the superconducting transition temperature Tc, where an unconventional metallic phase, known as the pseudogap, sets in. The pseudogap is not well understood yet and it is generally believed to be at the roots of the high Tc superconducting mechanism. By exploiting cluster dynamical mean field theory results on the two dimensional Hubbard Model, we show that the pseudogap and the superconducting gap compete for the same electrons, producing an unconventional form of the superconducting pairing that involves electrons in high energy states. We show that these findings leave visible fingerprints in the Raman response, which displays a characteristic peak-dip feature. The good agreement between theoretical and experimental results reveal an unprecedented relationship between the pseudogap and superconducting gap, which eventually boosts up the Tc.

Thursday 13 December 2018, 16:30 at IHES, Amphithéâtre Léon Motchane MATH-IHES (TBA) math
Erik Panzer ( University of Oxford ) Moduli spaces of discs and multiple zeta values in deformation quantization
Abstract: Kontsevich's 1997 proof of the formality conjecture provides a universal quantization of every Poisson manifold, by a formal power series whose coefficients are integrals over moduli spaces of marked discs. In joint work with Peter Banks and Brent Pym, we prove that these integrals evaluate to multiple zeta values, which are interesting transcendental numbers known from the Drinfeld associator and as the periods of mixed Tate motives. Our proof is algorithmic and allows for the explicit computation of arbitrary coefficients in the formality morphism, in particular the star product. The essential tools are Francis Brown's theory of polylogarithms on the moduli space of marked genus zero curves, single-valued integration due to Oliver Schnetz, and an induction over the natural fibrations of moduli spaces.

Friday 14 December 2018, 11:00 at LPTHE, Bibliothèque SEM-LPTHE (Séminaire du LPTHE) cond-mat.stat-mech|hep-th|math-ph
Blagoje Oblak ( ETH Zurich ) Stokes Drift as a Berry Phase
Abstract: In this talk I revisit Stokes drift in shallow water from a geometric perspective inspired by conformal field theory. Given a fluid on a circular pool supporting periodic waves, I argue that the displacement of fluid particles after one period involves a Berry phase associated with adiabatic conformal transformations. In particular, the phase shift produced by cnoidal waves can be evaluated in closed form, and may be accessible to experiments or numerical simulations. Conceptually, this relates fluid dynamics, symplectic geometry, conformal field theory and Thomas precession.

Friday 14 December 2018, 11:00 at APC, 454A (salle Luc Valentin) APC-COLLOQUIUM (Colloquium de l'APC) astro-ph
Gail Mclaughlin ( North Carolina University ) Neutrino and nuclear physics of the r-process
Abstract: The production of the elements heavier than iron in the universe has long been associated with neutron-capture processes. The most neutron-rich isotopes are created by rapid (r ) neutron-capture nucleosynthesis in extreme astrophysical environments. Specifics of these environments and the location of the astrophysical sites in which the r process occurs have remained open problems. It has been reported that observations of the gravitational wave event GW170817 and its electromagnetic counterpart suggest that neutron star mergers are a site of r-process nucleosynthesis. Still many questions remain, such as the nature of the astrophysical conditions within the merger responsible for element synthesis and whether mergers can account for all galactic r-process production. If we hope to fully understand the connection between this discovery and the origin of r-process elements, uncertainties in neutrino and nuclear astrophysics must be reduced. I will highlight the role played by neutrinos and nuclear masses.

Friday 14 December 2018, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Saso Grozdanov ( MIT ) Higher-form symmetries in magnetohydrodynamics, effective field theory and holography

Monday 17 December 2018, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Alexei Kornyshev ( Imperial College London, UK ) Electrochemical plasmonics: A path to electrotunable self-assembling optical metamaterials (scenarios navigated by theory)
Abstract: See the attached file.
  • Nanoplasmonics-CNRS-2019-Kornyshev.pdf (535342 bytes) OPEN

Monday 17 December 2018, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-PHM (Séminaire de physique mathématique) math-ph
Eric Vernier The U(1)-invariant clock model, and symmetries at root of unity
Abstract: In this talk I will introduce a quantum chain generalizing the Zn clock model by keeping nearest-neighbour interaction and self-duality, but further requiring U(1) invariance. This model is integrable, and can be related to XXZ-type chains at their "roots of unity" points, which present a number of striking features including a rich structure of degeneracies. Such a correspondence allows to revisit these features in an interesting way, in particular I will discuss the physics of the "exact complete strings" underlying degeneracies in the Bethe ansatz language, and, in close connection with the latter, the presence of an underlying Onsager symmetry algebra.

Monday 17 December 2018, 11:15 at CPHT, Seminar room Aile 0 SEM-CPHT (Séminaire du CPHT) hep-th
Shira Chapman ( Amsterdam U. ) Holographic Complexity in Vaidya Spacetimes
Abstract: We investigate holographic complexity for eternal black hole backgrounds perturbed by shock waves, with both the complexity=action (CA) and complexity=volume (CV) proposals. We consider Vaidya geometries describing a thin shell of null fluid with arbitrary energy falling in from one of the boundaries of a two-sided AdS-Schwarzschild spacetime. We demonstrate how scrambling and chaos are imprinted in the complexity of formation and in the full time evolution of complexity via the switchback effect for light shocks, as well as analogous properties for heavy ones.

Tuesday 18 December 2018, 11:00 at LPTMS, LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) physics
Christophe Texier ( LPTMS, Université Paris-Sud ) Counting the equilibria of a directed polymer in a random medium and Anderson localisation
Abstract: I will discuss a new connection between two different problems: the counting of equilibria of a directed polymer in a random medium (DPRM) and the problem of Anderson localisation for the 1D Schrödinger equation. Using the Kac-Rice formula, it is possible to express the mean number of equilibria of a DPRM in terms of functional determinants. In the one-dimensional situation, these functional determinants can be calculated thanks to the Gelfand-Yaglom method, showing that the mean number of equilibria of the DPRM growth exponentially with the length of the polymer, with a rate controlled by the generalized Lyapunov exponent (GLE) of the localisation problem (cumulant generating function of the log of the wave function). The GLE is solution of a spectral problem studied by combining numerical approaches and WKB-like approximation. Furthermore, the formalism can be extended in order to obtain the number of equilibria at fixed energy, providing the (annealed) distribution of the energy density of the line over the equilibria. Reference: Yan V. Fyodorov, Pierre Le Doussal, Alberto Rosso and Christophe Texier, Exponential number of equilibria and depinning threshold for a directed polymer in a random potential, Annals of Physics 397, 1-64 (2018)

Tuesday 18 December 2018, 14:00 at APC, 646 A - Mondrian APC-TH (Seminar of the theory group of APC) hep-th
Florent Michel ( Durham University ) Testing relativistic vacuum decay with cold atoms
Abstract: Vacuum decay is a prominent example of strongly nonlinear effects in quantum field theory with potentially important implications for cosmology, relating to phase transitions in the early universe or the supposed metastability of the current Higgs vacuum. Although a general theoretical description was laid out in the 80s by Sidney Coleman and his collaborators, fundamental questions pertaining to the back-reaction of true vacuum bubbles on space-time curvature and their correlations remain so far unanswered, calling for different approaches to the problem. In this talk, after a brief review of Coleman's theory emphasizing its genericness and limitations, I will present a recently-proposed cold-atoms model in which some of these ideas could be tested in laboratory experiments. I will discuss the mathematical correspondence between the two problems and focus on how a localized defect changes the decay rate, taking the example of a vortex in a Bose-Einstein condensate and comparing with the effect of a black hole in a relativistic theory.

Tuesday 18 December 2018, 16:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-HEP (Séminaire de physique des particules et de cosmologie) hep-ph
Cyril Pitrou ( IAP - Institut d'Astrophysique de Paris ) Anisotropies of the astrophysical gravitational background
Abstract: The astrophysical background of gravitational waves (AGWB) is made up by the incoherent superposition of gravitational wave signals emitted by a large number of resolved and unresolved astrophysical sources from the onset of stellar activity until today. I present a theoretical framework to fully characterize the AGWB in terms of energy density anisotropies which is based on the resolution of Olbers

Wednesday 19 December 2018, 11:00 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Cécile Repellin ( MIT, Cambridge, USA ) Detecting fractional Chern insulators using circular dichroism
Abstract: Great efforts are currently devoted to the engineering of topological Bloch bands in ultracold atomic gases. Recent achievements in this direction, together with the possibility of tuning inter-particle interactions, suggest that strongly-correlated states reminiscent of fractional quantum Hall (FQH) liquids could soon be generated in these systems. In this experimental framework, where transport measurements are limited, identifying unambiguous signatures of FQH-like states constitutes a challenge on its own. Here, we demonstrate that the fractional nature of the quantized Hall conductance, a fundamental characteristic of FQH states, could be detected in ultracold gases through a circular-dichroic measurement, namely, by monitoring the energy absorbed by the atomic cloud upon a circular drive. We validate this approach by comparing the circular-dichroic signal to the many-body Chern number, and discuss how such measurements could be performed to distinguish FQH-type states from competing states. Our scheme offers a practical tool for the detection of topologically-ordered states in quantum-engineered systems, with potential applications in solid state.

Thursday 20 December 2018, 10:00 at IHP, 201 RENC-THEO (Rencontres Théoriciennes) hep-th
Matthias Gaberdiel ( ETH Zuerich ) TBA

Thursday 20 December 2018, 11:40 at IHP, 201 RENC-THEO (Rencontres Théoriciennes) hep-th
Raoul Santachiara ( LPTMS, Orsay ) Subtle facets of Liouville field theories and their manifestations in statistical models
Abstract: In this talk I will briefly review the conformal bootstrap approach in two dimensions. I will focus in particular on the Liouville field theory, that plays a major role among the solutions of the bootstrap equations. I will discuss some new insights of this conformal field theory, concerning in particular its extensions via the analytic continuation of the central charge and/or of the spectrum. I will mention recent applications of these results to critical percolation and to the log-Random Energy Models.

Thursday 20 December 2018, 14:00 at LPTHE, Library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Luc Darmé ( NCBJ, Swierk ) Hunting light dark sectors from astrophysics to colliders and fixed target experiments
Abstract: Minimal self-consistent scenarios with light (sub-GeV) dark matter are usually accompanied by a correspondingly light "dark sector". The presence of the latter leads to bright detection prospects at fixed target experiments and colliders and potentially strong astrophysical bounds. We will illustrate this point by exploring explicitly a typical simple fermion dark matter setup, examining in particular the key role of the dark sector in the interplay between accelerator searches and astrophysical signatures.

Friday 21 December 2018, 10:30 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-PHM (Séminaire de physique mathématique) math-ph
Matthias Gaberdiel ( ETH Zürich ) (TBA)

Friday 21 December 2018, 11:00 at LPTHE, Bibliothèque SEM-LPTHE (Séminaire du LPTHE) cond-mat.stat-mech|hep-th|math-ph
José Carrasco ( Univ. Complutense Madrid ) Restricted spectra in exactly solvable supersymmetric spin chains: the long-range t-J model
Abstract: We compute the exact partition function of the one-dimensional su(1|m) supersymmetric t-J model with long-range interactions, in the presence of an external magnetic field and a charge chemical potential. To this end, we use the equivalence of this model to a suitable modification of the su(1|m) Haldane-Shastry spin chain with chemical potential terms. In this way, we also obtain a complete analytical description of the spectrum of the long-range t-J model in terms of the supersymmetric version of Haldane's motifs and their related skew Young tableaux and skew Schur polynomials. As an application, we give a complete description of the different ground state phases, characterized by their spin content -- i.e., su(1|2), su(1|1) and su(0|2), apart from the trivial phases consisting only of holes or fermions of one type.

Friday 21 December 2018, 13:00 at IPHT, Salle Claude Itzykson, Bât. 774 SOUTEN-HDR (Soutenance d'Habilitation à Diriger des Recherches) hep-th
Sylvain Ribault ( IPhT ) Solving two-dimensional conformal field theories
Abstract: In this habilitation defense, I give a subjective overview of some recent progress in solving two-dimensional conformal field theories. I discuss what solving means and which techniques can be used. I insist that there is much to discover about Virasoro-based CFTs, i.e. CFTs that have no symmetries beyond conformal symmetry. I claim that we should start with CFTs that exist for generic central charges, because they are simpler than CFTs at rational central charges, and can nevertheless include them as special cases or limits. Finally, I argue that in addition to writing research articles, we should use various other media, in particular Wikipedia. \\ \\ Members of the jury: Denis Bernard, Matthias Gaberdiel, Jesper Jacobsen, Vyacheslav Rychkov, Véronique Terras, Gérard Watts, Jean-Bernard Zuber.

Friday 21 December 2018, 14:00 at LPTM, 4.13 St Martin II SEM-LPTM-UCP (Seminaires du LPTM , Universite de Cergy Pontoise) cond-mat
Aurélien Manchon ( KAUST, PSE-CEMSE , Thuwal, Saudi Arabia ) Spin-Orbit Physics at Magnetic Interfaces
Abstract: Chiral objects are ubiquitous in science and pose fundamental challenges, such as the importance of chiral molecules in commercial drugs or the dominance of matter over antimatter in the universe. Magnetic materials lacking inversion symmetry, called chiral magnets, constitute a unique platform for the exploration and control of chiral objects. In these systems, typically comprising multilayers of transition metal ferromagnets and heavy metals (W, Pt, Ta, Bi2Se3 etc.), interfacial spin-orbit coupling adopts a peculiar form, called Rashba-like interaction [1,2]. This interaction promotes a wealth of physical phenomena, among which the emergence of magnetic skyrmions – topological magnetic textures –, spin-orbit torques – an efficient means to electrically control magnetization dynamics –, as well as chiral magnetic damping – energy dissipation that depends on the texture chirality. Over the years, my group has developed several theoretical approaches to describe spin-orbit physics at interfaces, from minimal models to tight binding and first principle methods, in order to provide guidelines to better understand these effects. In this seminar, I will present various aspects of the interplay between spin transport and magnetization dynamics mediated by spin-orbit coupling in chiral magnets. I will first discuss the nature of interfacial spin-orbit coupling in magnetic multilayers and examine how it facilitates the onset of chiral magnetic textures [3]. I will then present the physics of spin-orbit torques [4,5], their general features in metals and specific characteristics in topological insulators [6]. Finally, the novel concept of chiral damping [7], i.e. the idea that energy dissipation depends on the chirality, will be introduced. In conclusion, I will show how such effects can be exploited to excite and control antiferromagnets and other frustrated magnets [8].

Tuesday 8 January 2019, 11:00 at LPTMS, LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) physics
Fabio Franchini ( Institut Ruder Boškovic, Zagreb, Croatia ) Spontaneous Ergodicity Breaking in Invariant Matrix Models
Abstract: We reconsider the study of the eigenvectors of a random matrix, to better understand the relation between localization and eigenvalue statistics. Traditionally, the requirement of base invariance has lead to the conclusion that invariant models describe only extended (conductive) systems. We show that deviations of the eigenvalue statistics from the Wigner-Dyson universality reflects itself on the eigenvector distribution. In particular, gaps in the eigenvalue density spontaneously break the U(N) symmetry to a smaller one, hence rendering the system not anymore ergodic. Models with log-normal weights, recently considered also in string theory models such as ABJM theories, show a critical eigenvalue distribution which would indicate a critical breaking of the U(N) symmetry, supposedly resulting into a multi-fractal eigenvector statistics. These results pave the way to the exploration of localization problems using random matrices via the study of new classes of observables and potentially to novel, interdisciplinary, applications of matrix models.

Tuesday 8 January 2019, 16:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-HEP (Séminaire de physique des particules et de cosmologie) hep-ph
Jose Cembranos ( Universidad Complutense de Madrid ) Alternative cosmologies from UV completions of gravity
Abstract: The fundamental nature of Dark Matter (DM) and Dark Energy (DE) has not been established. Indeed, beyond its gravitational effects, both components remain undetected by present experiments. In this situation, it is reasonable to wonder if other alternatives can effectively explain the observations usually associated with their existence. The modification of the gravitational interaction has been studied in this context from many different approaches. However, the large amount of different astrophysical evidences makes difficult to think that modified gravity can account for all these observations. On the other hand, if such a modification introduces new degrees of freedom, they may work as DM or DE candidates. We will summarize the phenomenology of these gravitational candidates focusing in the DM question.

Wednesday 9 January 2019, 11:30 at IPN, Bâtiment 100, Salle A015
( $ $ )
IPN-THEO (Séminaire du groupe de physique théorique de l'IPN Orsay) nucl-th
F. Raimondi ( CEA Saclay ) Nuclear electromagnetic dipole response with the Self-Consistent Green's Function formalism.
Abstract: Microscopic calculations of the electromagnetic response of light and medium-mass nuclei are now feasible thanks to the availability of realistic nuclear interactions with accurate saturation and spectroscopic properties, and the development of large-scale computing methods for many-body physics. In my talk I will present calculations of isovector dipole electromagnetic response and related quantities, i.e. integrated dipole cross section and polarizability, and compare with data from photoabsorption and Coulomb excitation experiments. The many-body formalism adopted is the Self-Consistent Green's Functions formalism, and special emphasis will be given to the methods used to include non-perturbatively the nuclear correlations. The nuclei considered are selected isotopes in the Oxygen, Nickel and Calcium chains, with the aim of investigating the evolution of computed quantities towards the neutron dripline.
  • 2019_01_09_F_Raimondi.pdf (204452 bytes) OPEN

Thursday 10 January 2019, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Tba Rencontres TBA

Thursday 10 January 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Satoshi Nawata ( Fudan University ) Refined Chern-Simons theory at large N

Thursday 10 January 2019, 14:00 at LPTM, 4.13 St Martin II SEM-LPTM-UCP (Seminaires du LPTM , Universite de Cergy Pontoise) cond-mat
Dmitry Kovrizhin ( Dept. of Physics, University of Oxford, UK ) Casimir energy and semiclassical degeneracies for magnetic Skyrmions
Abstract: We study the role of zero-point quantum fluctuations in magnetic states which on the classical level are close to spin-aligned ferromagnets. These include Skyrmion textures which arise in the context of non-zero topological charge solutions of non-linear sigma-models, and topologically-trivial spirals generated by a competition of Heisenberg and Dzyaloshinskii-Moriya interactions. We show that the degeneracy of the Bogomolny-Prasad-Sommerfield (BPS) manifold is not lifted by quantum fluctuations in the case of general non-linear sigma-models with the target space given by Kähler manifolds presenting a physically-important example of the case of Grassmanian manifold relevant to quantum Hall effect in graphene. Further, we show that the phenomenon of vanishing zero-point motion can appear more generally in slowly-twisted almost ferromagnets. From a broader perspective, beyond the implications to exotic magnets, we suggest that this work provides two interesting angles on long-standing interesting issues in statistical physics and field theory. One is the existence of undressed states generally. The other item is the behaviour of ‘non-universal’ quantities, i.e. those involving information from the lattice scale, in the ‘universal’ continuum limit. Here, the Casimir energy of zero-point fluctuations vanishes in the continuum limit, but is nonzero for any lattice discretisation. This Casimir energy, however, does play a physical role, e.g. in the lifting of ground-state degeneracies in a process known as quantum order by disorder. Our results obtained for non-linear sigma models without supersymmetry about the absence of zero-point fluctuations in BPS manifolds may either be a feature entirely unrelated to the more familiar instances arising in relativistic field theory from the cancellation of fluctuations in bosonic and fermionic sectors, or they may be more pedestrian and perhaps intuitively accessible instances of the same physics.

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