Summing inflationary logarithms in nonlinear sigma models
Sign Up to like & getrecommendations! Published in 2022 at "Journal of High Energy Physics"
DOI: 10.1007/jhep03(2022)069
Abstract: Abstract We consider two nonlinear sigma models on de Sitter background which involve the same derivative interactions as quantum gravity but without the gauge issue. The first model contains only a single field, which can… read more here.
Keywords: sigma models; nonlinear sigma; inflationary logarithms; summing inflationary ... See more keywords
Higher-order tree-level amplitudes in the nonlinear sigma model
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep11(2019)074
Abstract: We present a generalisation of the flavour-ordering method applied to the chiral nonlinear sigma model with any number of flavours. We use an extended Lagrangian with terms containing any number of derivatives, organised in a… read more here.
Keywords: order; sigma model; tree level; amplitudes nonlinear ... See more keywords
Exploring instantons in nonlinear sigma models with spin-lattice systems
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review B"
DOI: 10.1103/physrevb.103.144436
Abstract: Instanton processes are present in a variety of quantum field theories relevant to high energy as well as condensed matter physics. While they have led to important theoretical insights and physical applications, their underlying features… read more here.
Keywords: sigma models; lattice systems; instantons nonlinear; exploring instantons ... See more keywords
Composite fermion nonlinear sigma models
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review B"
DOI: 10.1103/physrevb.104.125119
Abstract: We study the integer quantum Hall plateau transition using composite fermion mean-field theory. We show that the topological $\theta = \pi$ term in the associated nonlinear sigma model [P. Kumar et al., Phys. Rev. B… read more here.
Keywords: hole symmetry; composite fermion; particle hole; nonlinear sigma ... See more keywords
Compact, charged boson stars and shells in the CPN gravitating nonlinear sigma model
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.045007
Abstract: We study $U(1)$ gauged gravitating compact $Q$-ball, $Q$-shell solutions in a nonlinear sigma model with the target space $\mathbb{C}P^N$. The models with odd integer $N$ and a special potential can be parameterized by $N$-th complex… read more here.
Keywords: model; sigma model; nonlinear sigma; space ... See more keywords
Isolated skyrmions in the CP2 nonlinear sigma model with a Dzyaloshinskii-Moriya type interaction
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.103.065008
Abstract: We study two dimensional soliton solutions in the $CP^2$ nonlinear $\sigma$-model with a Dzyaloshinskii-Moriya type interaction. First, we derive such a model as a continuous limit of the $SU(3)$ tilted ferromagnetic Heisenberg model on a… read more here.
Keywords: moriya type; dzyaloshinskii moriya; model; sigma model ... See more keywords
Canonical quantization of nonlinear sigma models with a theta term and applications to symmetry-protected topological phases
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.96.045010
Abstract: We canonically quantize $O(D+2)$ nonlinear sigma models (NLSMs) with theta term on arbitrary smooth, closed, connected, oriented $D$-dimensional spatial manifolds $\mathcal{M}$, with the goal of proving the suitability of these models for describing symmetry-protected topological… read more here.
Keywords: ground; term; symmetry protected; theta term ... See more keywords
Critical dynamics of the antiferromagnetic O(3) nonlinear sigma model with conserved magnetization.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review. E"
DOI: 10.1103/physreve.105.064128
Abstract: We study the near-equilibrium critical dynamics of the O(3) nonlinear sigma model describing isotropic antiferromagnets with a nonconserved order parameter reversibly coupled to the conserved total magnetization. To calculate response and correlation functions, we set… read more here.
Keywords: nonlinear sigma; critical dynamics; sigma model; model ... See more keywords