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Donal O'Connell11/12/2023, 09:00
The double copy is at the heart of QCD meets Gravity. In this review talk I will focus on some of the many successes of the double copy, and also point to some areas where progress would be particularly welcome.
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Marco Chiodaroli (Uppsala University)11/12/2023, 09:45
I present a framework for extending the double copy to five-dimensional N=2 Yang-Mills-Einstein theories with non-compact gauge groups. While non-compact gauge groups are known to lead to inconsistencies in case of YM theories, they become a viable option in supergravity and have long been known and investigated by the supergravity community. We will show that their amplitudes can be...
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Shruti Paranjape11/12/2023, 10:45
Gravity possesses many interesting properties such as its enhanced soft behaviour under large BCFW shifts and its KLT constructibility. Planar N=4 SYM also has related nice properties, most of which can be understood as a result of its underlying Amplituhedron structure. In this talk, we address whether gravity has an underlying positive geometry. Our approach will be to construct the...
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Nic Pavao (Northwestern University)11/12/2023, 11:15
Traditionally the double copy is praised for efficient construction of gravitational S-matrix elements at high orders in perturbation theory, by way of simpler gauge theory building blocks. In this talk, we will find that color-kinematics duality can also be used to inform UV completion of effective field theories (EFTs). In our approach, UV information about gauge/gravity EFTs can be...
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Harald Pfeiffer (AEI Potsdam)11/12/2023, 14:00
Binary black holes are the most numerous source of observed
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gravitational waves (GW). Precise knowledge about the interaction
between two black holes and the emitted GWs are of high importance for
finding and analysing GW signals, as well as to deepen the
understanding of the structure and solutions of Einstein's equations.
In this talk, I summarize the contributions of Numerical... -
Nabha Shah11/12/2023, 14:30
The metric and corresponding geodesic equation describing test-particle dynamics in a background encode gravitational data to all orders in the post-Minkowskian (PM) expansion and effectively resum certain infinite classes of flat-space Feynman diagrams. In the context of the connection between the bound gravitational two-body problem and the relativistic scattering of massive particles...
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Jordan Wilson-Gerow (Caltech)11/12/2023, 15:00
The standard approximations to the two-body problem in General Relativity include weak-field perturbation theory (“PN’’ and “PM’’) and a strong-field scheme which expands in powers of the mass ratio but retains all orders in G-Newton, ie. “self-force’’. I’ll discuss recent work which used inspiration from self-force to simplify perturbative computations. We introduce an effective field theory...
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Francesco Riva11/12/2023, 16:00
Massive resonances with spin larger or equal 2 are ubiquitous in physics, but their mass is always larger than their inverse size (the EFT cutoff). I will show that this condition follows from the requirement that the underlying theory be unitary and causal.
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Alessandro Vichi11/12/2023, 16:30
I explore the Effective Field Theory bootstrap formalism, leveraging dispersion relations to establish sum rules linking low-energy scattering amplitudes to high-energy partial wave expansion. We analyze the impact of different Regge behaviors at large energies and apply the formalism to study Pion Scattering at large-N. Imposing the presence of spin-2 states, we derive a mass bound for...
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Denis Karateev11/12/2023, 17:00
I will discuss scattering amplitudes of neutral Goldstone bosons such as dilatons, pions or branons. I will construct non-perturbative bounds on the dimensionless ratios of Wilson coefficient describing their low energy behaviour. I will then analyse scattering amplitudes saturating the above bounds. I will show that these amplitudes in some parameter range contain resonances with complex...
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Jennifer Roloff (Brookhaven National Laboratory (US))12/12/2023, 09:00
Jets are a central component of many analyses at collider experiments, and uncertainties related to jet reconstruction and QCD limit the precision of a variety of experimental analyses. Their production involves both perturbative and non-perturbative aspects of QCD, resulting in a rich structure that is difficult to model precisely. The talk will discuss several different measurements that...
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Song He12/12/2023, 09:45
I report on a new discovery that the ``stringy” amplitudes of trφ3 (the simplest theory of colored scalars) secretly contain the scattering amplitudes for pions and non-supersymmetric gluons in arbitrary dimensions. At tree level, this unified object naturally explains some surprising, hidden properties shared by amplitudes in all these colored theories, namely the string and particle...
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Christoph Dlapa (DESY Hamburg)12/12/2023, 10:45
I present work which provides evidence through two loops that rational letters of polylogarithmic Feynman integrals are captured by the Landau equations, when the latter are recast as a polynomial of the kinematic variables of the integral, known as the principal A-determinant. Focusing on one loop, I further discuss how all square-root letters may also be obtained, by re-factorizing the...
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Mathieu Giroux (McGill University)12/12/2023, 11:15
Crossing symmetry in interacting quantum field theory suggests that particles and antiparticles traveling back in time are indistinguishable. To rigorously prove this property, it is necessary to show that on-shell observables across different channels are boundary values of the same analytic function. Known non-perturbative proofs in specific cases heavily rely on fundamental physical...
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Matthias Wilhelm (University of Copenhagen)12/12/2023, 14:00
Multi-loop Feynman integrals for collider physics are known to contain intricate geometries and to evaluate to complicated transcendental numbers and functions. In this talk, I will investigate Feynman integrals contributing to the emission of gravitational waves up to fifth order in the post-Minkowskian expansion, identifying new geometries that lead to new transcendental functions.
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Anastasia Volovich12/12/2023, 14:30
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Sebastian Poegel12/12/2023, 15:00
Multi-loop Feynman integrals are crucial in meeting the requirements for high-precision predictions of both collider and gravitational-wave experiments. Such integrals are associated to geometries, providing information about the function classes appearing in their evaluation. In this talk I will discuss integrals associated to hyperelliptic curves, a natural generalization of elliptic curves....
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Guilherme Pimentel (Scuola Normale Superiore)12/12/2023, 16:00
I will describe how methods largely developed to tackle problems in QCD are extremely useful to understand the gravitational problem of the initial conditions. More specifically, I will how to obtain differential equations (in terms of boundary momenta) for tree-level cosmological correlators in a toy model. The differential equations follow a set of self consistent rules that can be explained...
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Charalampos Anastasiou12/12/2023, 16:30
Surveys of the Large Scale Structure are becoming increasingly detailed. A primary theoretical tool for analyzing this data and constraining cosmological models is the Effective Field Theory (EFT) of Large Scale Structure. In this presentation, I will describe an effort to calculate loop corrections to cosmological correlators within the EFT of LSS. I will discuss how loop integrals in...
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Chia-Hsien Shen12/12/2023, 17:00
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Alexander Yohei Huss (CERN)13/12/2023, 09:00
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Johann Usovitsch (CERN)13/12/2023, 09:45
The focus will be on improved integral reduction with the Kira program. I will present a seeding algorithm that can improve the reduction time by more than one order of magnitude compared to the current algorithm in Kira. I will demonstrate the use case of the seeding algorithm using some state-of-the-art integral reduction examples. At the end of the talk, I will discuss the synergy of Kira...
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Gregory Soyez (IPhT, CEA Saclay)13/12/2023, 10:45
Monte Carlo event generators are central tools in today's particle physics community. In this talk, I will focus on their central part, the parton shower algorithm. I will discuss how, from a perturbative QCD standpoint, one can define, assess and improve their (logarithmic) accuracy.
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Stephen Philip Jones (University of Durham (GB))13/12/2023, 11:15
Sector decomposition is a well known method for numerically computing Feynman integrals. In the physical (Minkowski) region, it is sometimes necessary to deform the integration contour into the complex plane in order to avoid poles, or more generally singular hypersurfaces, in the integration domain. However, there exist Feynman integrals with `pinched' singularities, for which the usual...
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Riccardo Sturani (IFT-UNESP/ICTP-SAIFR)14/12/2023, 09:00
The detections of gravitational waves emitted by compact binary coalescences gave rise to the new science of Gravitational Wave Astronomy, which opened up new possibilities for scientific investigation also in cosmology and fundamental physics. In this presentation I will give an overview of the observational results and some hints to the impact they had, are having and will have on our...
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Callum Jones14/12/2023, 09:45
I will describe an approach to incorporating absorption effects into the post-Minkowskian effective description of two-body classical gravitational scattering. By coupling the usual point-particle effective description to an invisible sector of gapless internal degrees-of-freedom, the leading-order absorptive effects are encoded in the low-energy expansion of a spectral density function; for...
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Pavel Novichkov14/12/2023, 10:45
I present a method for computing gravitational waveforms from singularities of the five-point amplitude. The procedure is based on the KMOC formalism and leverages the analytic properties of amplitudes in the complex plane. I demonstrate this approach at tree level by deriving the time-domain waveform for Kerr black holes up to the fourth order in spin.
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Rodolfo Russo (University of London (GB))14/12/2023, 11:15
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Prof. Gabriel Menezes14/12/2023, 14:00
Double field theory can be naturally constructed as the double copy of a Yang-Mills theory. Indeed, a double copy prescription for the Yang-Mills action can be provided that produces a double field theory action in which the dilaton has been integrated out. In turn, this result can be extended by including higher-derivative terms. In this talk I will review how the double-copy map for the...
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Kokkimidis Patatoukos14/12/2023, 14:30
I discuss expressions for gravity amplitudes and show that they can be written as term wise double copies of those in YM gauge theory derived from BCFW.
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Lucile Cangemi14/12/2023, 15:00
Higher-spin theory and massive gauge invariance can be used as input for constraining root-Kerr and Kerr amplitudes, relevant for calculating gravitational observables with spin. Elegant three-point spin-s amplitudes exist for Kerr black holes, however constructing the corresponding four-point Compton amplitudes is an open problem. In this talk, I will discuss the origin of the Kerr...
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Christopher Whittall14/12/2023, 16:00
Calculations of the scatter angle in hyperbolic black hole encounters have been of recent cross-disciplinary interest, driven by its potential to advance post-Minkowskian theory and the effective-one-body model of binary dynamics. In this talk I will consider the self-force approach to modelling black hole scattering, starting with a general introduction to self-force theory. I will then...
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Fei Teng14/12/2023, 16:30
I will present the full NLO scattering waveform computed from the observable based formalism. The waveform satisfies the universal soft theorem up to the NNLO. I will end the talk by comparing the result with that computed from the Multipolar-Post-Minkowskian formalism, which requires a rotation of the incoming center-of-mass frame to align with that at the minimal approach.
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Gustav Mogull14/12/2023, 17:00
I will discuss our recent calculations of the observables (impulse, spin kick, scattering angle) involved in the scattering of two black holes or neutron stars at fourth post Minkowskian order (three-loop order) using the Worldline Quantum Field Theory (WQFT) framework. These 4PM observables now include both spin-orbit and adiabatic tidal corrections — inclusion of the latter necessitates a...
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TREVOR SCHEOPNER14/12/2023, 17:30
In Dixon's original papers on the Mathisson–Papapetrou–Dixon worldline equations of motion for extended bodies in general relativity, he found the unique definition for the multipole moments of the stress tensor for a body in general motion in curved spacetime. This definition coincides only with the stationary multipole moments of the body which are determined by the three-point amplitude...
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Andrea Guerrieri15/12/2023, 09:00
The numerical S-matrix Bootstrap aims at establishing non-perturbative universal bounds on physical observables that can be extracted from scattering amplitudes in any dimension. In this talk, I will focus on dimensions greater or equal to four, focusing on three main topics: no-go theorems for supersymmetric quantum gravity, rigorous model dependent bounds on Higgs couplings, and...
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Chris White (Queen Mary University of London)15/12/2023, 09:45
Certain non-abelian gauge theories obey so-called BCJ duality, whereby their colour algebra is accompanied by a second algebra involving kinematic degrees of freedom, and which in turn allows amplitudes in such theories to be double-copied to gravity. For special theories in particular gauges, the kinematic algebra can be ascertained exactly, and corresponds to an (infinitely dimensional) Lie...
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Jasper Roosmale Nepveu15/12/2023, 10:45
The covariant color-kinematics duality was proposed by Cheung and Mangan as a relation between the gauged bi-adjoint scalar theory and Yang-Mills theory. It holds at the level of the equations of motion and directly leads to a simple map between tree-level scattering amplitudes. I will show that this framework naturally incorporates higher-derivative
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corrections. Moreover, it implies that the... -
Arnd Behring (CERN)15/12/2023, 11:15
Twist-2 operators play an important role in QCD: they arise from the operator product expansion in deep-inelastic scattering and underlie the definition of collinear parton distribution functions (PDFs). We discuss the calculation of heavy quark contributions to matrix elements of these twist-2 operators at three-loop order in QCD. These matrix elements serve as matching coefficients to...
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Simone Zoia15/12/2023, 14:00
I review the recent advances in the computation of QCD scattering amplitudes at the high multiplicity frontier. Their computation is hindered by both algebraic and analytic complexity, making them one of the main bottlenecks to obtaining predictions at the next to-next-to-leading order in QCD for many interesting LHC processes. The last few years have seen dramatic progress in this direction,...
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Vasily Sotnikov (University of Zurich (UZH))15/12/2023, 14:30
I will present the recent computation of a complete set of the two-loop five-point Feynman integrals with one external mass. Employing the method of canonical differential equations and the properties of Chen's iterated integrals, we construct a basis of special functions that greatly facilitates the calculation of scattering amplitudes, and is amenable for applications in NNLO QCD...
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Eero Aleksi Kurkela15/12/2023, 15:00
Gravity meets QCD in a very concrete way in neutron stars. Their cores contain ultra-dense hadronic matter whose densities reach as high as those realized in ultrarelativistic heavy-ion collisions at the LHC. In these collisions, ordinary nuclear matter melts into a new quark matter phase. This naturally raises the question: Does quark matter also exist inside neutron stars? The rapid...
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