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Ilham Ait Brik

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Papers by Ilham Ait Brik

Research paper thumbnail of On the existence and properties of left invariant <i>k</i> -symplectic structures on Lie groups with bi-invariant peudo-Riemannian metric

Communications in algebra, Mar 12, 2024

Research paper thumbnail of On the Existence and Properties of Left Invariant <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>k</mi></mrow><annotation encoding="application/x-tex">k</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.03148em;">k</span></span></span></span>-Symplectic Structures on Lie Groups with Bi-Invariant Pseudo-Riemannian Metric

arXiv (Cornell University), Feb 19, 2023

k-symplectic manifolds are a convenient framework to study classical field theories and they are ... more k-symplectic manifolds are a convenient framework to study classical field theories and they are a generalization of polarized symplectic manifolds. This paper focus on the existence and the properties of left invariant k-symplectic structures on Lie groups having a bi-invariant pseudo-Riemannian metric. We show that compact semi-simple Lie groups and a large class of Lie groups having a bi-invariant pseudo-Riemannian metric does not carry any left invariant ksymplectic structure. This class contains the oscillator Lie groups which are the only solvable non abelian Lie groups having a bi-invariant Lorentzian metric. However, we built a natural left invariant n-symplectic structure on SL(n, R). Moreover, up to dimension 6, only three connected and simply connected Lie groups have a bi-invariant indecomposable pseudo-Riemannian metric and a left invariant k-symplectic structure, namely, the universal covering of SL(2, R) with a 2-symplectic structure, the universal covering of the Lorentz group SO(3, 1) with a 2-symplectic structure, and a 2-step nilpotent 6-dimensional connected and simply connected Lie group with both a 1-symplectic structure and a 2-symplectic structure.

Research paper thumbnail of On k-para-Kähler Lie algebras, a subclass of k-symplectic Lie algebras

Communications in Algebra, 2021

k-Para-Kähler Lie algebras are a generalization of para-Kähler Lie algebras (k = 1) and constitut... more k-Para-Kähler Lie algebras are a generalization of para-Kähler Lie algebras (k = 1) and constitute a subclass of ksymplectic Lie algebras. In this paper, we show that the characterization of para-Kähler Lie algebras as left symmetric bialgebras can be generalized to k-para-Kähler Lie algebras leading to the introduction of two new structures which are different but both generalize the notion of left symmetric algebra. This permits also the introduction of generalized S-matrices. We determine then all the k-symplectic Lie algebras of dimension (k + 1) and all the six dimensional 2-para-Kähler Lie algebras.

Research paper thumbnail of On the existence and properties of left invariant <i>k</i> -symplectic structures on Lie groups with bi-invariant peudo-Riemannian metric

Communications in algebra, Mar 12, 2024

Research paper thumbnail of On the Existence and Properties of Left Invariant <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>k</mi></mrow><annotation encoding="application/x-tex">k</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.03148em;">k</span></span></span></span>-Symplectic Structures on Lie Groups with Bi-Invariant Pseudo-Riemannian Metric

arXiv (Cornell University), Feb 19, 2023

k-symplectic manifolds are a convenient framework to study classical field theories and they are ... more k-symplectic manifolds are a convenient framework to study classical field theories and they are a generalization of polarized symplectic manifolds. This paper focus on the existence and the properties of left invariant k-symplectic structures on Lie groups having a bi-invariant pseudo-Riemannian metric. We show that compact semi-simple Lie groups and a large class of Lie groups having a bi-invariant pseudo-Riemannian metric does not carry any left invariant ksymplectic structure. This class contains the oscillator Lie groups which are the only solvable non abelian Lie groups having a bi-invariant Lorentzian metric. However, we built a natural left invariant n-symplectic structure on SL(n, R). Moreover, up to dimension 6, only three connected and simply connected Lie groups have a bi-invariant indecomposable pseudo-Riemannian metric and a left invariant k-symplectic structure, namely, the universal covering of SL(2, R) with a 2-symplectic structure, the universal covering of the Lorentz group SO(3, 1) with a 2-symplectic structure, and a 2-step nilpotent 6-dimensional connected and simply connected Lie group with both a 1-symplectic structure and a 2-symplectic structure.

Research paper thumbnail of On k-para-Kähler Lie algebras, a subclass of k-symplectic Lie algebras

Communications in Algebra, 2021

k-Para-Kähler Lie algebras are a generalization of para-Kähler Lie algebras (k = 1) and constitut... more k-Para-Kähler Lie algebras are a generalization of para-Kähler Lie algebras (k = 1) and constitute a subclass of ksymplectic Lie algebras. In this paper, we show that the characterization of para-Kähler Lie algebras as left symmetric bialgebras can be generalized to k-para-Kähler Lie algebras leading to the introduction of two new structures which are different but both generalize the notion of left symmetric algebra. This permits also the introduction of generalized S-matrices. We determine then all the k-symplectic Lie algebras of dimension (k + 1) and all the six dimensional 2-para-Kähler Lie algebras.

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