Zobrazeno 1 - 10
of 291
pro vyhledávání: '"Núñez, Carmen A."'
The low energy effective action describing the Kaluza-Klein reduction of string theory on a $d$-torus possesses a continuous O($d, d$) global symmetry. The non-geometric piece of this symmetry, parameterized by a bi-vector $\beta$, was recently shown
Externí odkaz:
http://arxiv.org/abs/2410.17067
In Kaluza-Klein compactifications, some symmetries of the higher dimensional theory are preserved in lower dimensions, others are broken, and occasionally, there are symmetry enhancements. The symmetries that are enhanced by toroidal compactification
Externí odkaz:
http://arxiv.org/abs/2410.07325
Concave in measure and d-concave in measure nonautonomous scalar ordinary differential equations given by coercive and time-compactible maps have similar properties to equations satisfying considerably more restrictive hypotheses. This paper describe
Externí odkaz:
http://arxiv.org/abs/2407.15515
Publikováno v:
Journal of Nonlinear Science 34, 105 (2024)
The occurrence of tracking or tipping situations for a transition equation $x'=f(t,x,\Gamma(t,x))$ is analyzed under the assumptions on concavity in $x$ either of the maps giving rise to the asymptotic equations $x'=f(t,x,\Gamma_\pm(t,x))$ or of thei
Externí odkaz:
http://arxiv.org/abs/2311.17566
Kaluza-Klein reductions of low energy string effective actions possess a continuous $O(d,d) $ symmetry. The non-geometric elements of this group, parameterized by a bi-vector $\beta$, are not inherited from the symmetries of the higher-dimensional th
Externí odkaz:
http://arxiv.org/abs/2307.02537
The global dynamics of a nonautonomous Carath\'eodory scalar ordinary differential equation $x'=f(t,x)$, given by a function $f$ which is concave in $x$, is determined by the existence or absence of an attractor-repeller pair of hyperbolic solutions.
Externí odkaz:
http://arxiv.org/abs/2304.06417
Publikováno v:
SIAM Journal on Applied Dynamical Systems 22 (4), 2023
A function with finite asymptotic limits gives rise to a transition equation between a "past system" and a "future system". This question is analyzed in the case of nonautonomous coercive nonlinear scalar ordinary differential equations with concave
Externí odkaz:
http://arxiv.org/abs/2212.11621
The paper analyzes the structure and the inner long-term dynamics of the invariant compact sets for the skewproduct flow induced by a family of time-dependent ordinary differential equations of nonhomogeneous linear dissipative type. The main assumpt
Externí odkaz:
http://arxiv.org/abs/2212.04303
Continuous O$(d,d)$ global symmetries emerge in Kaluza-Klein reductions of $D$-dimensional string supergravities to $D-d$ dimensions. We show that the non-geometric elements of this group effectively act in the $D$-dimensional parent theory as a hidd
Externí odkaz:
http://arxiv.org/abs/2209.02079
Publikováno v:
J Dyn Diff Equat (2022)
A critical transition for a system modelled by a concave quadratic scalar ordinary differential equation occurs when a small variation of the coefficients changes dramatically the dynamics, from the existence of an attractor-repeller pair of hyperbol
Externí odkaz:
http://arxiv.org/abs/2110.10145