17 Result(s)
within
Matthew T. Walters
Elementary Particles, Quantum Field Theory
Quantum Physics
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Open AccessFlux correlators and semiclassics
We consider correlators for the flux of energy and charge in the background of operators with large global U(1) charge in conformal field theory (CFT). It has recently been shown that the corresponding Euclide...
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Open AccessTowards a nonperturbative construction of the S-matrix
We present a nonperturbative recipe for directly computing the S-matrix in strongly-coupled QFTs. The method makes use of spectral data obtained in a Hamiltonian framework and can be applied to a wide range of th...
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Open AccessThermalization and chaos in a 1+1d QFT
We study aspects of chaos and thermodynamics at strong coupling in a scalar model using LCT numerical methods. We find that our eigenstate spectrum satisfies Wigner-Dyson statistics and that the coefficients d...
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Open AccessNonperturbative dynamics of (2+1)d ϕ4-theory from Hamiltonian truncation
We use Lightcone Conformal Truncation (LCT)—a version of Hamiltonian truncation — to study the nonperturbative, real-time dynamics of ϕ4-theory in 2+1 dimensions. This theory has UV divergences that need to be re...
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Open AccessOn the stress tensor light-ray operator algebra
We study correlation functions involving generalized ANEC operators of the form ∫ dx
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Open AccessSolving the 2D SUSY Gross-Neveu-Yukawa model with conformal truncation
We use Lightcone Conformal Truncation to analyze the RG flow of the two-dimensional supersymmetric Gross-Neveu-Yukawa theory, i.e. the theory of a real scalar superfield with a ℤ2-symmetric cubic superpotential, ...
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Open AccessMomentum space CFT correlators for Hamiltonian truncation
We consider Lorentzian CFT Wightman functions in momentum space. In particular, we derive a set of reference formulas for computing two- and three-point functions, restricting our attention to three-point func...
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Open AccessNonperturbative matching between equal-time and lightcone quantization
We investigate the nonperturbative relation between lightcone (LC) and standard equal-time (ET) quantization in the context of λϕ4 theory in d = 2. We discuss the perturbative matching between bare parameters and...
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Open AccessLightcone effective Hamiltonians and RG flows
We present a prescription for an effective lightcone (LC) Hamiltonian that includes the effects of zero modes, focusing on the case of Conformal Field Theories (CFTs) deformed by relevant operators. We show ho...
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Open AccessRG flow from ϕ 4 theory to the 2D Ising model
We study 1+1 dimensional ϕ 4 theory using the recently proposed method of conformal truncation. Starting in the UV CFT of free field theory, we construct a complete basis of states...
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Open AccessA conformal truncation framework for infinite-volume dynamics
We present a new framework for studying conformal field theories deformed by one or more relevant operators. The original CFT is described in infinite volume using a basis of states with definite momentum, P , an...
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Open AccessHawking from Catalan
The Virasoro algebra determines all ‘graviton’ matrix elements in AdS3/CFT2. We study the explicit exchange of any number of Virasoro gravitons between heavy and light CFT2 operators at large central charge. Thes...
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Open AccessVirasoro conformal blocks and thermality from classical background fields
We show that in 2d CFTs at large central charge, the coupling of the stress tensor to heavy operators can be re-absorbed by placing the CFT in a non-trivial background metric. This leads to a more precise comp...
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Open AccessEikonalization of conformal blocks
Classical field configurations such as the Coulomb potential and Schwarzschild solution are built from the t-channel exchange of many light degrees of freedom. We study the CFT analog of this phenomenon, which...
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Open AccessIdentifying boosted new physics with non-isolated leptons
We demonstrate the utility of leptons which fail standard isolation criteria in searches for new physics at the LHC. Such leptons can arise in any event containing a highly boosted particle which decays to bot...
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Open AccessUniversality of long-distance AdS physics from the CFT bootstrap
We begin by explicating a recent proof of the cluster decomposition principle in AdS≥4 from the CFT≥3 bootstrap. The CFT argument also computes the leading interactions between distant objects in AdS≥4, and we co...
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New light species and the CMB
We consider the effects of new light species on the Cosmic Microwave Background. In the massless limit, these effects can be parameterized in terms of a single number, the relativistic degrees of freedom. We p...
