Zobrazeno 1 - 10
of 2 105
pro vyhledávání: '"Bothmer A"'
Autor:
von Bothmer, Hans-Christian
Let $\omega$ be a plane autonomous system and C its configuration of algebraic integral curves. If the singularities of C are quasi homogeneous we give new conditions for existence of a Darboux integrating factor or a Darboux first integral. This is
Externí odkaz:
http://arxiv.org/abs/2409.01751
Internal magnetic field structures observed by PSP/WISPR in a filament related coronal mass ejection
Autor:
Cappello, G. M., Temmer, M., Vourlidas, A., Braga, C., Liewer, P. C., Qiu, J., Stenborg, G., Kouloumvakos, A., Veronig, A. M., Bothmer, V.
Publikováno v:
A&A 688, A162 (2024)
We track and investigate from white-light data taken with the Wide-field Instrument for Solar PRobe (WISPR) aboard Parker Solar Probe (PSP), localized density enhancements, reflecting small-scale magnetic structures belonging to a filament-related co
Externí odkaz:
http://arxiv.org/abs/2402.14682
We study equivariant birationality from the perspective of derived categories. We produce examples of nonlinearizable but stably linearizable actions of finite groups on smooth cubic fourfolds.
Comment: 28 pages, with an appendix by Brendan Hass
Comment: 28 pages, with an appendix by Brendan Hass
Externí odkaz:
http://arxiv.org/abs/2303.17678
It is well known that every smooth cubic threefold is the zero locus of the Pfaffian of a 6 x 6 skew-symmetric matrix of linear forms in P^4. To compactify the space of such Pfaffian representations of a given cubic and to study the construction in f
Externí odkaz:
http://arxiv.org/abs/2212.07235
We show that every skew-symmetric 6 x 6 matrix of linear forms with vanishing Pfaffian is congruent to one of finitely many types of matrices, each of which is characterised by a specific pattern of zeroes (and some other linear relations) among its
Externí odkaz:
http://arxiv.org/abs/2210.02926
Autor:
Bhattacharjee, Debesh, Subramanian, Prasad, Bothmer, Volker, Nieves-Chinchilla, Teresa, Vourlidas, Angelos
Solar coronal mass ejections are well known to expand as they propagate through the heliosphere. Despite this, their cross-sections are usually modeled as static plasma columns within the magnetohydrodynamics (MHD) framework. We test the validity of
Externí odkaz:
http://arxiv.org/abs/2203.06996
Autor:
Temmer, Manuela, Bothmer, Volker
Publikováno v:
A&A 665, A70 (2022)
Aims: We statistically investigate the plasma and magnetic field characteristics of the upstream regions of interplanetary coronal mass ejections (ICMEs) and their evolution as function of distance to the Sun in the inner heliosphere. We use a sample
Externí odkaz:
http://arxiv.org/abs/2202.04391
Results due to Druel and Beauville show that the blowup of the intermediate Jacobian of a smooth cubic threefold X in the Fano surface of lines can be identified with a moduli space of semistable sheaves of Chern classes c_1=0, c_2=2, c_3=0 on X. Her
Externí odkaz:
http://arxiv.org/abs/2112.10554
Autor:
von Bothmer, Bernard
Publikováno v:
Louisiana History: The Journal of the Louisiana Historical Association, 2024 Jul 01. 65(3), 357-360.
Externí odkaz:
https://www.jstor.org/stable/27338683
The understanding of mobile hexapods, i.e., parallel manipulators with six legs, is one of the driving questions in theoretical kinematics. We aim at contributing to this understanding by employing techniques from algebraic geometry. The set of confi
Externí odkaz:
http://arxiv.org/abs/2012.05120