搜索结果: 1-15 共查到“理学 Noether”相关记录38条 . 查询时间(0.079 秒)
与经典变分原理相比，基于由微分方程定义的作用量的Herglotz广义变分原理给出了非保守动力学系统的一个变分描述，它不仅能够描述所有采用经典变分原理能够描述的动力学过程，而且能够应用于经典变分原理不能适用的非保守或耗散系统．将Herglotz广义变分原理拓展到相空间，研究相空间中非保守力学系统的Herglotz广义变分原理与Noether定理及其逆定理．首先，提出相空间中Herglotz广义变分原...
On an arbitrary compact Riemann surface, necessary and sufficient conditions are found for the existence of semistable vector bundles with slope between zero and one and a prescribed number of linearl...
We prove the Noether-Lefschetz conjecture on the moduli space of quasi-polarized K3 surfaces. This is deduced as a particular case of a general theorem that states that low degree cohomology classes o...
Non-Noether Symmetries and Lutzky Conserved Quantities for Mechanico-Electrical Systems
Mechanico-electrical system Non-Noether symmetry Lutzky conserved quantity
2012/8/7
We apply the non-Noether symmetry theory for mechanical systems to Lagrange–Maxwell mechanico-electrical systems. For these systems,
we derive the Lutzky conserved quantities from the corresponding e...
Noether symmetry for Gauss-Bonnet dilatonic gravity
Noether symmetry Gauss-Bonnet dilatonic
2011/9/27
Noether symmetry for Gauss-Bonnet-Dilatonic interaction exists for a constant dilatonic scalar potential and a linear functional dependence of the coupling parameter on the scalar field. The symmetry ...
Abstract: We discuss the f(R) gravity model in which the origin of dark energy is identified as a modification of gravity. The Noether symmetry with gauge term is investigated for the f(R) cosmologica...
在时间t不变群的特殊无限小变换下,研究Lagrange系统的特殊Noether-Lie对称性以及由特殊Noether-Lie对称性导致的特殊Noether守恒量和特殊Hojman守恒量.最后,举例说明结果的应用.
On a kind of Noether symmetries and conservation laws in k-cosymplectic field theory
Symmetries Conservation laws Noether theorem Hamiltonian field theories
2010/12/6
This paper is devoted to studying symmetries of certain kinds of k-cosymplectic Hamiltonian
systems in first-order classical field theories. Thus, we introduce a particular class of
symmetries and s...
Noether's problem for some 2-groups
Noether’s problem rationality problem the inverse Galois problem
2010/12/6
Let G be a finite group and k be a field. Let G act on the rational function field k(xg : g ∈ G) by k-automorphisms defined by g · xh = xgh for any g, h ∈ G. Noether’s problem asks whether the fixed f...
Noether symmetric minisuperspace model of $f(R)$ cosmology
metric $f(R)$ cosmology symmetric minisuperspace
2010/3/18
We study the metric $f(R)$ cosmology using Noether symmetry approach by utilizing the behavior of the corresponding Lagrangian under infinitesimal generators of the desired symmetry. The existence of ...
Noether Symmetries and Covariant Conservation Laws in Classical, Relativistic and Quantum Physics
Noether Symmetries Quantum Physics Covariant Conservation Laws
2010/3/18
We review the Lagrangian formulation of Noether symmetries (as well as "generalized Noether symmetries") in the framework of Calculus of Variations in Jet Bundles, with a special attention to so-calle...
Noether恒等式的推广及其应用
广义Noether恒等式 非定域变换 高阶微商杨—Mills场 守恒荷
2009/6/1
从系统的作用量在普遍的定域和非定域变换下的性质出发,导出了含非定城变换的广义Noether恒等式.将其用于高阶微商杨—Mills场论,求出了有别于BRS荷的新PBRS守恒荷和非定域变换下的新守恒荷.
广义Noether恒等式与守恒荷
守恒荷 Noether恒等式
2009/6/1
考虑非不变作用理系统在无限连续群下的变换性质,导致了广义Noether恒等式,由此可导出系统的强守恒律和弱守恒律,给出与此相联系的重质量杨-Mills场守恒的PBRS荷,它有别于守恒的BRS荷.讨论了变更性系统的Dirac约束.
Noether整环上的齐次复合Groebner基
Noether整环 齐次复合Groebner基 合冲条件 S-多项式
2012/11/21
复合是指将多项式的每一个变元用新的多项式替换.对于Noether整环上的多项式环,如果复合与项序相容并且是一组首幂积为排列幂的首1齐次多项式,那么Noether整环上齐次Groebner基计算与齐次复合可交换.
非定域量子Noether恒等式及应用
高阶微商理论 路径积分 Noether恒等式 守恒律 CS理论
2008/12/2
基于高阶微商奇异拉氏量系统的相空间生成泛函,导出了定域和非定域变换下的量子正则Noether恒等式;对高阶微商规范不变系统,导出了位形空间中定域和非定域变换下的量子Noether恒等式.指出在某些情形下,由量子Noether恒等式可导致系统的量子守恒律.这种求守恒律的程式与量子Noether(第一)定理不同.用于高阶微商非AbelChern-Simons(CS)理论,求出某些非定域等变换下的量子守...