Results 61 to 70 of about 2,430,073 (342)
On classicalization in nonlinear sigma models [PDF]
Physics Letters B, 2012 We consider the phenomenon of classicalization in nonlinear sigma models with both positive and negative target space curvature and with any number of derivatives. We find that the theories with only two derivatives exhibit a weak form of classicalization, and that the quantitative results depend on the sign of the curvature.
Leslaw Rachwal +2 more
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Comments on Noncommutative Sigma Models [PDF]
, 2002 We review the derivation of a noncommutative version of the nonlinear sigma model on $\CPn$ and it's soliton solutions for finite $\theta$ emphasizing the similarities it bears to the GMS scalar field theory.
D. Tong +24 more
core +2 more sources
Cosmological constraints on generalized Chaplygin gas model: Markov Chain Monte Carlo approach [PDF]
JCAP 1003:025,2010, 2010 We use the Markov Chain Monte Carlo method to investigate a global constraints on the generalized Chaplygin gas (GCG) model as the unification of dark matter and dark energy from the latest observational data: the Constitution dataset of type supernovae Ia (SNIa), the observational Hubble data (OHD), the cluster X-ray gas mass fraction, the baryon ...
arxiv +1 more source
Integrability in sigma-models [PDF]
, 2019 Abstract The following topics are covered in this chapter: (1) Homogeneous spaces, (2) Classical integrability of sigma-models in two dimensions, (3) Topological terms, (4) Background-field method and beta-function, (5) S-matrix bootstrap in the O(N) model, (6) Supersymmetric coset models and strings on AdS(d) x X.
openaire +3 more sources
Communications In Mathematical Physics, 1989 We obtain the invariants of Witten's topologicalσ-model by gauge fixing a topological action and using BRST symmetry. The fields and the BRST formalism are interpreted geometrically.
Baulieu, L., Singer, I. M.
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FEBS Letters, EarlyView.Low‐density lipoprotein receptor‐related protein 6 (LRP6) is a key receptor for the Wnt antagonist Dickkopf1 (DKK1). DKK1 protein expression is induced in a bleomycin (BLM)‐induced lung injury model. We show that DKK1 induces proinflammatory and profibrotic genes in lung fibroblasts.
Eun‐Ah Sung +6 more
wiley +1 more source
Instantons, renormalons and the theta angle in integrable sigma models
SciPost Physics, 2023 Some sigma models which admit a theta angle are integrable at both $\vartheta=0$ and $\vartheta=\pi$. This includes the well-known $O(3)$ sigma model and two families of coset sigma models studied by Fendley.
Marcos Mariño, Ramon Miravitllas, Tomas Reis
doaj +1 more source
Theta-terms in nonlinear sigma-models [PDF]
, 1999 We trace the origin of theta-terms in non-linear sigma-models as a nonperturbative anomaly of current algebras. The non-linear sigma-models emerge as a low energy limit of fermionic sigma-models.
A.G. Abanov +27 more
core +2 more sources
Taurine promotes glucagon‐like peptide‐1 secretion in enteroendocrine L cells
FEBS Letters, EarlyView.Taurine, a sulfur‐containing amino acid, is likely taken up by enteroendocrine L cells via the taurine transporter. This process increases the levels of cytosolic ATP. The increase in intracellular Ca2+ concentrations and glucagon‐like peptide‐1 secretion through membrane depolarization is caused by the closure of ATP‐sensitive potassium channels ...
Yuri Osuga +6 more
wiley +1 more source
Topological sigma models [PDF]
Communications in Mathematical Physics, 1988 A variant of the usual supersymmetric nonlinear sigma model is described, governing maps from a Riemann surfaceΣ to an arbitrary almost complex manifoldM. It possesses a fermionic BRST-like symmetry, conserved for arbitraryΣ, and obeyingQ 2=0. In a suitable version, the quantum ground states are the 1+1 dimensional Floer groups.
openaire +3 more sources