Rigid local systems and motives of type G2: with an appendix by Michale Dettweiler and Nicholas M. Katz
Using the middle convolution functor MCχ introduced by N. Katz, we prove the existence of rigid local systems whose monodromy is dense in the simple algebraic group G2. We derive the existence of motives for motivated cycles which have a motivic Galois group of type G2. Granting Grothendieck’s stand...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
24 March 2010
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| In: |
Compositio mathematica
Year: 2010, Jahrgang: 146, Heft: 4, Pages: 929-963 |
| ISSN: | 1570-5846 |
| DOI: | 10.1112/S0010437X10004641 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1112/S0010437X10004641 Verlag, lizenzpflichtig, Volltext: https://www.cambridge.org/core/journals/compositio-mathematica/article/rigid-local-systems-and-motives-of-type-g2-with-an-appendix-by-michale-dettweiler-and-nicholas-m-katz/7D15D3383A51EB58325E6387F78783B2 
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| Verfasserangaben: | Michael Dettweiler and Stefan Reiter |
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| 520 | |a Using the middle convolution functor MCχ introduced by N. Katz, we prove the existence of rigid local systems whose monodromy is dense in the simple algebraic group G2. We derive the existence of motives for motivated cycles which have a motivic Galois group of type G2. Granting Grothendieck’s standard conjectures, the existence of motives with motivic Galois group of type G2 can be deduced, giving a partial answer to a question of Serre. | ||
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