On linearity of finitely generated R-analytic groups

Linearity problem for non-abelian tensor products

In this paper we give an example of a linear group such that its tensor square is not linear. Also, we formulate some sufficient conditions for the linearity of non-abelian tensor products $G \otimes H$ and tensor squares $G \otimes G$. Using these results we prove that tensor squares of some groups with one relation and some knot groups are linear. We prove that the Peiffer square of finitely generated linear groups is linear. At the end we construct faithful linear representations for the non-abelian tensor square of free group and free nilpotent group.

关于有限生成单左序群$G_ρ$的一些代数与解析性质

On some algebraic and analytic properties of the finitely generated simple left orderable groups $G_ρ$

本文研究了Hyde与第二作者构造的首个有限生成单左序群族$G_ρ$，证明了其非有限可表示、非内顺从、无Kazhdan性质$(T)$但具性质FA、首$l^2$-Betti数为零，且为一致单群，并描述了周期标号下的群结构。

On groups with linear sci growth

We prove that the semistability growth of hyperbolic groups is linear, which implies that hyperbolic groups which are sci (simply connected at infinity) have linear sci growth. Based on the linearity of the end-depth of finitely presented groups we show that the linear sci is preserved under amalgamated products over finitely generated one-ended groups. Eventually one proves that most non-uniform lattices have linear sci.

Analytic properties of bivariate representation and conjugacy class zeta functions of finitely generated nilpotent groups

Let $\mathbf{G}$ be a unipotent group scheme defined in terms of a nilpotent Lie lattice over the ring $\mathcal{O}$ of integers of a number field. We consider bivariate zeta functions of groups of the form $\mathbf{G}(\mathcal{O})$ encoding, respectively, the numbers of isomorphism classes of irreducible complex representations of finite dimensions and the numbers of conjugacy classes of congruence quotients of the associated groups. We show that the domains of convergence and meromorphic continuation of these zeta functions of groups $\mathbf{G}(\mathcal{O})$ are independent of the number fi…

Torsion growth in finitely presented pro-$p$ groups

We prove that torsion in the abelianizations of open normal subgroups in finitely presented pro-$p$ groups can grow arbitrarily fast. By way of contrast in $\mathbb Z_p$- analytic groups the torsion growth is at most polynomial.

从灯夫群到亚阿贝尔群的正则映射

Regular maps from the lamplighter to metabelian groups

本文证明灯夫群可单射利普希茨映射到任何非虚拟幂零的有限生成亚阿贝尔群，从而说明这类群满足Hume等人提出的解析薄/解析厚二分法。

实有理曲面自同构：正性与线性性

Real Rational Surface Automorphisms : Positivity and Linearity

本文研究保持尖点三次曲线的实有理曲面自同构，通过自由基本群中的正半群与本原转移矩阵证明其正拓扑熵，并在 m+n 为奇数时给出伪 Anosov 实现。

Uniform analytic properties of representation zeta functions of finitely generated nilpotent groups

Let $G$ be a finitely generated torsion-free nilpotent group. The representation zeta function $ζ_G(s)$ of $G$ enumerates twist isoclasses of finite-dimensional irreducible complex representations of $G$. We prove that $ζ_G(s)$ has rational abscissa of convergence $a(G)$ and may be meromorphically continued to the left of $a(G)$ and that, on the line $\{s\in\mathbb{C} \mid \textrm{Re}(s) = a(G)\}$, the continued function is holomorphic except for a pole at $s=a(G)$. A Tauberian theorem yields a precise asymptotic result on the representation growth of $G$ in terms of the position and order of …

Hausdorff dimensions in $p$-adic analytic groups

Let $G$ be a finitely generated pro-$p$ group, equipped with the $p$-power series. The associated metric and Hausdorff dimension function give rise to the Hausdorff spectrum, which consists of the Hausdorff dimensions of closed subgroups of $G$. In the case where $G$ is $p$-adic analytic, the Hausdorff dimension function is well understood; in particular, the Hausdorff spectrum consists of finitely many rational numbers closely linked to the analytic dimensions of subgroups of $G$. Conversely, it is a long-standing open question whether the finiteness of the Hausdorff spectrum implies that $G$…

On the analytic zero divisor conjecture of Linnell

In this note we prove that in the case of finitely generated amenable groups the classical zero divisor conjecture implies the analytic zero divisor conjecture of Linnell.

On hereditarily self-similar $p$-adic analytic pro-$p$ groups

A non-trivial finitely generated pro-$p$ group $G$ is said to be strongly hereditarily self-similar of index $p$ if every non-trivial finitely generated closed subgroup of $G$ admits a faithful self-similar action on a $p$-ary tree. We classify the solvable torsion-free $p$-adic analytic pro-$p$ groups of dimension less than $p$ that are strongly hereditarily self-similar of index $p$. Moreover, we show that a solvable torsion-free $p$-adic analytic pro-$p$ group of dimension less than $p$ is strongly hereditarily self-similar of index $p$ if and only if it is isomorphic to the maximal pro-$p$…

Finite part of operator K-theory for groups finitely embeddable into Hilbert space and the degree of non-rigidity of manifolds

In this paper, we study lower bounds on the K-theory of the maximal $C^*$-algebra of a discrete group based on the amount of torsion it contains. We call this the finite part of the operator K-theory and give a lower bound that is valid for a large class of groups, called the "finitely embeddable groups". The class of finitely embeddable groups includes all residually finite groups, amenable groups, Gromov's monster groups, virtually torsion free groups (e.g. $Out(F_n)$), and any group of analytic diffeomorphisms of an analytic connected manifold fixing a given point. It is an open question if…

The ratio and generating function of cogrowth coefficients of finitely generated groups

Let G be a group generated by $r$ elements $g_1,g_2,..., g_r.$ Among the reduced words in $g_1,g_2,..., g_r$ of length $n$ some, say $γ_n,$ represent the identity element of the group $G.$ It has been shown in a combinatorial way that the $2n$th root of $γ_{2n}$ has a limit, called the cogrowth exponent with respect to generators $g_1,g_2,..., g_r.$ We show by analytic methods that the numbers $γ_n$ vary regularly; i.e. the ratio $γ_{2n+2}/γ_{2n}$ is also convergent. Moreover we derive new precise information on the domain of holomorphy of $γ(z),$ the generating function associated with the co…

Towards a dichotomy for the Reidemeister zeta function

We prove a dichotomy between rationality and a natural boundary for the analytic behavior of the Reidemeister zeta function for automorphisms of non-finitely generated torsion abelian groups and for endomorphisms of groups $\mathbb Z_p^d,$ where $\mathbb Z_p$ the group of p-adic integers. As a consequence, we obtain a dichotomy for the Reidemeister zeta function of a continuous map of a topological space with fundamental group that is non-finitely generated torsion abelian group. We also prove the rationality of the coincidence Reidemeister zeta function for tame endomorphisms pairs of finitel…

On the genericity of Whitehead minimality

We show that a finitely generated subgroup of a free group, chosen uniformly at random, is strictly Whitehead minimal with overwhelming probability. Whitehead minimality is one of the key elements of the solution of the orbit problem in free groups. The proofs strongly rely on combinatorial tools, notably those of analytic combinatorics. The result we prove actually depends implicitly on the choice of a distribution on finitely generated subgroups, and we establish it for the two distributions which appear in the literature on random subgroups.

关于具有有限多个不动点的区间微分同胚群

On groups of diffeomorphisms of the interval with finitely many fixed points

本文针对每个非单位元仅有有限多个不动点的区间保向微分同胚群，证明其不可约子群要么为仿射群，要么具有无限围道，从而肯定了Girth Alternative。