Let $X$ be a general complex projective hypersurface in $\mathbb{P}^{n+1}$ of degree $d>1$. A point $P$ not in $X$ is called uniform if the monodromy group of the projection of $X$ from $P$ is isomorphic to the symmetric group. We prove that all the points in $\mathbb{P}^{n+1}$ are uniform for $X$, generalizing a result of Cukierman on general plane curves.
The monodromy conjecture is an umbrella term for several conjectured relationships between poles of zeta functions, monodromy eigenvalues and roots of Bernstein-Sato polynomials in arithmetic geometry and singularity theory. Even the weakest of these relations -- the Denef--Loeser conjecture on topological zeta functions -- is open for surface singularities. We prove it for a wide class of multidimensional singularities that are non-degenerate with respect to their Newton polyhedra, including all such singularities of functions of four variables. A crucial difference from the known case of thr…
A family of flat connections on the projective space having dihedral monodromy and algebraic Garnier solutions
A. Girand在复射影平面$\mathbb{P}^2$上构造了一个显式的双参数平坦联络族。这些联络具有二面角单值性,它们的极轨迹是由一条二次曲线和三条切线组成的规定的五次曲线。在本文中,我们给出了这一结构的一个推广。也就是说,我们在复射影空间$\mathbb{P}^n$上构造了一个显式的平坦联络$n$参数族。此外,我们还讨论了这些联系与Garnier系统之间的关系。
Computing Milnor fiber monodromy for some projective hypersurfaces
我们在第二页描述了一种计算极序谱序列退化的$\mathbb{P}^n$超曲面顶部Milnor纤维上同调的单值性和极序过滤的算法。在超平面排列和自由的局部拟齐次超曲面的情况下,并假设一个关键猜想,该算法比上述超曲面快得多。我们的猜想得到了L. Narv\' ez Macarro和M.齐藤根的伯恩斯坦佐藤多项式的超曲面,所有的例子计算到目前为止,和一个部分结果。对于来自反射群的超平面排列,在我们的例子中显示了它们的极序谱在上同调上的惊人对称性。在平面曲线的情况下,我们也改进了我们以前的结果。
A log generic hypersurface in $\mathbb{P}^n$ with respect to a birational modification of $\mathbb{P}^n$ is by definition the image of a generic element of a high power of an ample linear series on the modification. A log very-generic hypersurface is defined similarly but restricting to line bundles satisfying a non-resonance condition. Fixing a log resolution of a product $f=f_1\ldots f_p$ of polynomials, we show that the monodromy conjecture, relating the motivic zeta function with the complex monodromy, holds for the tuple $(f_1,\ldots,f_p,g)$ and for the product $fg$, if $g$ is log generic…
We use the cut and paste relation $[Y^{[2]}] = [Y][\mathbb{P}^m] + \mathbb{L}^2 [F(Y)]$ in $K_0(\text{Var}_k)$ of Galkin--Shinder for cubic hypersurfaces arising from projective geometry to characterize cubic hypersurfaces of sufficiently high dimension under certain numerical or genericity conditions. Removing the conditions involving the middle Betti number from the numerical conditions used extends the possible $Y$ to cubic hypersurfaces, complete intersections of two quadric hypersurfaces, or complete intersections of two quartic hypersurfaces. The same method also gives a family of other …
We investigate the stronger form of the Bogomolov-Gieseker inequality on smooth hypersurfaces in the projective space of any degree and dimension. The main technical tool is the theory of tilt-stability conditions in the derived category.
We employ the formalism of vanishing cycles and perverse sheaves to introduce and study the vanishing cohomology of complex projective hypersurfaces. As a consequence, we give upper bounds for the Betti numbers of projective hypersurfaces, generalizing those obtained by different methods by Dimca in the isolated singularities case, and by Siersma-Tibăr in the case of hypersurfaces with a $1$-dimensional singular locus. We also prove a supplement to the Lefschetz hyperplane theorem for hypersurfaces, which takes the dimension of the singular locus into account, and we use it to give a new proof…