Results 61 to 70 of about 809,200 (215)
Topological sigma models & dissipative hydrodynamics
Journal of High Energy Physics, 2016 22 pages. v2: added clarifications, fixed typos.
Haehl, Felix M +2 more
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Testing dark energy models in the light of $$\sigma _8$$ σ8 tension
European Physical Journal C: Particles and Fields, 2019 It has been pointed out that there exists a tension in $$\sigma _8-\varOmega _m$$ σ8-Ωm measurement between CMB and LSS observation. In this paper we show that $$\sigma _8-\varOmega _m$$ σ8-Ωm observations can be used to test the dark energy theories. We
Gaetano Lambiase +3 more
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Journal of High Energy Physics, 2019 We consider a class of ansätze for the construction of exact solutions of the Einstein-nonlinear σ-model system with an arbitrary cosmological constant in (3+1) dimensions.
Alex Giacomini, Marcello Ortaggio
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Summing inflationary logarithms in nonlinear sigma models
Journal of High Energy Physics, 2022 We consider two nonlinear sigma models on de Sitter background which involve the same derivative interactions as quantum gravity but without the gauge issue.
S. P. Miao, N. C. Tsamis, R. P. Woodard
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COMPLEXIFIED SIGMA-MODEL AND DUALITY [PDF]
Modern Physics Letters A, 2011 We show that the equations of motion associated with a complexified sigma-model action do not admit manifest dual SO (n, n) symmetry. In the process we discover new type of numbers which we called "complexoids" in order to emphasize their close relation with both complex numbers and matroids. It turns out that the complexoids allow one to consider the
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Twists of trigonometric sigma models
Journal of High Energy PhysicsWe introduce the ℤ N -twisted trigonometric sigma models, a new class of integrable deformations of the principal chiral model. Starting from 4d Chern-Simons theory on a cylinder, the models are constructed by introducing a ℤ N branch cut running along ...
Rashad Hamidi, Ben Hoare
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Universal 1-loop divergences for integrable sigma models
Journal of High Energy Physics, 2023 We present a simple, new method for the 1-loop renormalization of integrable σ-models. By treating equations of motion and Bianchi identities on an equal footing, we derive ‘universal’ formulae for the 1-loop on-shell divergences, generalizing case-by ...
Nat Levine
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PSEUDODUALITY IN SUPERSYMMETRIC SIGMA MODELS [PDF]
International Journal of Modern Physics A, 2010 We study the pseudoduality transformation in supersymmetric sigma models. We generalize the classical construction of pseudoduality transformation to supersymmetric case. We perform this both by component expansion method on manifold [Formula: see text] and by orthonormal coframe method on manifold [Formula: see text].
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Quantum distillation of Hilbert spaces, semi-classics and anomaly matching
Journal of High Energy Physics, 2018 A symmetry-twisted boundary condition of the path integral provides a suitable framework for the semi-classical analysis of nonperturbative quantum field theories (QFTs), and we reinterpret it from the viewpoint of the Hilbert space. An appropriate twist
Gerald V. Dunne +2 more
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Peculiarities of beta functions in sigma models
Journal of High Energy Physics, 2023 In this paper we consider perturbation theory in generic two-dimensional sigma models in the so-called first-order formalism, using the coordinate regularization approach. Our goal is to analyze the first-order formalism in application to β functions and
Oleksandr Gamayun +2 more
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