Results 31 to 40 of about 5,632,423 (343)
Initial states in integrable quantum field theory quenches from an integral equation hierarchy
Nuclear Physics B, 2016 We consider the problem of determining the initial state of integrable quantum field theory quenches in terms of the post-quench eigenstates. The corresponding overlaps are a fundamental input to most exact methods to treat integrable quantum quenches ...
D.X. Horváth, S. Sotiriadis, G. Takács
doaj +1 more source
T T ¯ $$ T\overline{T} $$ -deformation and long range spin chains
Journal of High Energy Physics, 2020 We point out that two classes of deformations of integrable models, developed completely independently, have deep connections and share the same algebraic origin. One class includes the T T ¯ $$ T\overline{T} $$ -deformation of 1+1 dimensional integrable
Balázs Pozsgay +2 more
doaj +1 more source
Relational Hamiltonian for group field theory [PDF]
Physical Review D, 2018 Using a massless scalar field as a clock variable, the Legendre transform of the group field theory Lagrangian gives a relational Hamiltonian. In the classical theory, it is natural to define 'equal relational time' Poisson brackets, where 'equal time ...
E. Wilson-Ewing
semanticscholar +1 more source
Properties of RG interfaces for 2D boundary flows
Journal of High Energy Physics, 2021 We consider RG interfaces for boundary RG flows in two-dimensional QFTs. Such interfaces are particular boundary condition changing operators linking the UV and IR conformal boundary conditions. We refer to them as RG operators.
Anatoly Konechny
doaj +1 more source
Quantum Fluctuations in the Effective Relational GFT Cosmology
Frontiers in Astronomy and Space Sciences, 2021 We analyze the size and evolution of quantum fluctuations of cosmologically relevant geometric observables, in the context of the effective relational cosmological dynamics of GFT models of quantum gravity.
L. Marchetti +3 more
doaj +1 more source
Unitary symmetry constraints on tensorial group field theory renormalization group flow [PDF]
Classical and quantum gravity, 2018 Renormalization group methods are an essential ingredient in the study of nonperturbative problems of quantum field theory. This paper deal with the symmetry constraints on the renormalization group flow for quartic melonic tensorial group field theories.
Vincent Lahoche, Dine Ousmane Samary
semanticscholar +1 more source
Hamiltonian truncation approach to quenches in the Ising field theory
Nuclear Physics B, 2016 In contrast to lattice systems where powerful numerical techniques such as matrix product state based methods are available to study the non-equilibrium dynamics, the non-equilibrium behaviour of continuum systems is much harder to simulate.
T. Rakovszky +4 more
doaj +1 more source
Inhomogeneous universe from group field theory condensate [PDF]
Journal of Cosmology and Astroparticle Physics, 2018 One of the fundamental challenges for quantum cosmology is to explain the emergence of our macroscopic Universe from physics at the Planck scale. In the group field theory (GFT) approach to quantum gravity, such a macroscopic universe results from the ...
Steffen Gielen
semanticscholar +1 more source
Overlaps after quantum quenches in the sine-Gordon model
Physics Letters B, 2017 We present a numerical computation of overlaps in mass quenches in sine-Gordon quantum field theory using truncated conformal space approach (TCSA). To improve the cut-off dependence of the method, we use a novel running coupling definition which has a ...
D.X. Horváth, G. Takács
doaj +1 more source
Separate universe framework in group field theory condensate cosmology [PDF]
Physical Review D, 2018 We use the separate universe framework to study cosmological perturbations within the group field theory formalism for quantum gravity, based on multi-condensate quantum states.
Florian Gerhardt +2 more
semanticscholar +1 more source