Rigid cohomology

In mathematics, rigid cohomology is a p-adic cohomology theory introduced by Berthelot (1986). It extends crystalline cohomology to schemes that need not be proper or smooth, and extends Monsky–Washnitzer cohomology to non-affine varieties. For a scheme X of finite type over a perfect field k, there are rigid cohomology groups Hi
rig(X/K) which are finite dimensional vector spaces over the field K of fractions of the ring of Witt vectors of k. More generally one can define rigid cohomology with compact supports, or with support on a closed subscheme, or with coefficients in an overconvergent isocrystal. If X is smooth and proper over k the rigid cohomology groups are the same as the crysalline cohomology groups.

The name "rigid cohomology" comes from its relation to rigid analytic spaces.

Kedlaya (2006) used rigid cohomology to give a new proof of the Weil conjectures.

References

Berthelot, Pierre (1986), "Géométrie rigide et cohomologie des variétés algébriques de caractéristique p", Mémoires de la Société Mathématique de France, Nouvelle Série (23): 7–32, ISSN 0037-9484, MR 865810
Kedlaya, Kiran S. (2009), "p-adic cohomology", in Abramovich, Dan; Bertram, A.; Katzarkov, L.; Pandharipande, Rahul; Thaddeus., M., Algebraic geometry---Seattle 2005. Part 2, Proc. Sympos. Pure Math., 80, Providence, R.I.: Amer. Math. Soc., pp. 667–684, arXiv:math/0601507, ISBN 978-0-8218-4703-9, MR 2483951
Kedlaya, Kiran S. (2006), "Fourier transforms and p-adic `Weil II'", Compositio Mathematica, 142 (6): 1426–1450, doi:10.1112/S0010437X06002338, ISSN 0010-437X, MR 2278753
Le Stum, Bernard (2007), Rigid cohomology, Cambridge Tracts in Mathematics, 172, Cambridge University Press, ISBN 978-0-521-87524-0, MR 2358812
Tsuzuki, Nobuo (2009), "Rigid cohomology", Mathematical Society of Japan. Sugaku (Mathematics), 61 (1): 64–82, ISSN 0039-470X, MR 2560145

External links

Kedlaya, Kiran S., Rigid cohomology and its coefficients
Le Stum, Bernard (2012), An introduction to rigid cohomology (PDF), Special week – Strasbourg

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