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arXiv 2204.09262math.RT
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正则半单元的特征标界与Thompson猜想的渐近结果

Character bounds for regular semisimple elements and asymptotic results on Thompson's conjecture

Michael Larsen, Jay Taylor, Pham Tiep

AI总结:

该研究给出有限典型群中满足特征多项式分解条件的正则半单元相关的特征标界,证明支集足够大的群元素可表为其两共轭元的乘积,并在素数维特殊情形下得到更强结论,推进了Thompson猜想相关研究。

摘要:

对任意整数$k$,存在界$B=B(k)$,使得若$g\in \operatorname{SL}_n(q)$的特征多项式是$\mathbb{F}_q$上至多$k$个两两不同的首一不可约多项式的乘积,则$\operatorname{SL}_n(q)$中支集至少为$B$的每个元素$x$都是$g$的两个共轭元的乘积。我们证明了这一结论,以及有限域上其他典型群的类似结果;在正交群和辛群情形下,结果稍弱。除有限个例外$(p,q)$外,在$n=p$为素数的特殊情形中,若$g$的阶为$\frac{q^p-1}{q-1}$,则$\operatorname{SL}_p(q)$中每个非数量元$x$都是$g$的两个共轭元的乘积。证明使用了Frobenius公式,结合有限典型群中幂零特征标与二次幂零特征标取值的上界。

英文摘要:

For every integer $k$ there exists a bound $B=B(k)$ such that if the characteristic polynomial of $g\in \operatorname{SL}_n(q)$ is the product of $\le k$ pairwise distinct monic irreducible polynomials over $\mathbb{F}_q$, then every element $x$ of $\operatorname{SL}_n(q)$ of support at least $B$ is the product of two conjugates of $g$. We prove this and analogous results for the other classical groups over finite fields; in the orthogonal and symplectic cases, the result is slightly weaker. With finitely many exceptions $(p,q)$, in the special case that $n=p$ is prime, if $g$ has order $\frac{q^p-1}{q-1}$, then every non-scalar element $x \in \operatorname{SL}_p(q)$ is the product of two conjugates of $g$. The proofs use the Frobenius formula together with upper bounds for values of unipotent and quadratic unipotent characters in finite classical groups.

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