# Thomas Schick

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Thomas_Schick
> Markdown URL: https://mediated.wiki/source/Thomas_Schick.md
> Source: https://en.wikipedia.org/wiki/Thomas_Schick
> Source revision: 1355940566
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

German mathematician

Thomas Schick Schick in Oberwolfach, Germany 2012 Born (1969-05-22) May 22, 1969 (age 57) Alzey, Germany Occupation Mathematician

**Thomas Schick** (born 22 May 1969 in [Alzey](/source/Alzey)) is a German mathematician, specializing in algebraic topology and differential geometry.

## Education and career

Schick studied mathematics and physics at the [Johannes Gutenberg University Mainz](/source/Johannes_Gutenberg_University_Mainz), where he received in 1994 his [Diplom](/source/Diplom) in mathematics and in 1996 his PhD ([Promotion](/source/Promotion_(Germany))) under the supervision of [Wolfgang Lück](/source/Wolfgang_L%C3%BCck) with thesis *Analysis on Manifolds of Bounded Geometry, Hodge-deRham Isomorphism and L 2 {\displaystyle L^{2}} -Index Theorem*.[1] As a [postdoc](/source/Postdoc) he was from 1996 to 1998 at the [University of Münster](/source/University_of_M%C3%BCnster) and from 1998 to 2000 an assistant professor at [Pennsylvania State University](/source/Pennsylvania_State_University), where he worked with [Nigel Higson](/source/Nigel_Higson) and [John Roe](/source/John_Roe_(mathematician)). Schick received his [habilitation](/source/Habilitation) in 2000 from the University of Münster and is since 2001 a professor for pure mathematics at the [University of Göttingen](/source/University_of_G%C3%B6ttingen).

His research deals with topological invariants, *e.g.* L 2 {\displaystyle L^{2}} -invariants and those invariants which result from the [K-theory](/source/K-theory) of [operator algebras](/source/Operator_algebra). Such invariants arise in generalizations of the [Atiyah-Singer index theorem](/source/Atiyah-Singer_index_theorem).

Schick, with Wolfgang Lück, introduced the strong Atiyah conjecture. Given a discrete group G, the Atiyah conjecture states that the L 2 {\displaystyle L^{2}} -[Betti numbers](/source/Betti_number) of a finite [CW-complex](/source/CW-complex) that has fundamental group G are integers, provided that G is torsion-free; furthermore, in the general case, the L 2 {\displaystyle L^{2}} -Betti numbers are rational numbers with denominators determined by the finite subgroups of G. In 2007 Schick, with Peter Linnell, proved a theorem which established conditions under which the Atiyah conjecture for a torsion-free group G implies the Atiyah conjecture for every finite extension of G; furthermore, they proved that the conditions are satisfied for a certain class of groups.[2] In 2000 Schick proved the Atiyah conjecture for a large class of special cases.[3] In 2007 he presented a method which proved the Baum-Connes conjecture for the full braid groups, and for other classes of groups which arise as (finite) extensions for which the Baum-Connes conjecture is known to be true.[4][5]

In the 1990s there were proofs of many special cases of the Gromov-Lawson-Rosenberg conjecture concerning criteria for the existence of a metric with positive [scalar curvature](/source/Scalar_curvature); in 1997 Schick published the first counterexample.[6]

He is the coordinator of the Courant Research Center's *Strukturen höherer Ordnung in der Mathematik* (Structures of Higher Order in Mathematics) at the [University of Göttingen](/source/University_of_G%C3%B6ttingen).[7] A major goal of the research center is the investigation of mathematical structures that could play a role in modern theoretical physics, especially [string theory](/source/String_theory) and [quantum gravity](/source/Quantum_gravity).

He was the managing editor for [Mathematische Annalen](/source/Mathematische_Annalen). In 2014 he was an invited speaker with talk *The topology of scalar curvature* at the [International Congress of Mathematicians](/source/International_Congress_of_Mathematicians) in [Seoul](/source/Seoul). In 2016 he became a full member of the [Göttingen Academy of Sciences and Humanities](/source/G%C3%B6ttingen_Academy_of_Sciences_and_Humanities).

## Selected publications

- *[Topology of scalar curvature.](https://arxiv.org/abs/1405.4220)* Proc. ICM 2014, Seoul.

- *[Operator algebras and topology.](https://arxiv.org/abs/math/0209164)* ICTP Summer School, Triest 2001.

- with Ulrich Bunke: *[Differential K-Theory.](https://arxiv.org/abs/1011.6663)*

- with Ulrich Bunke: *[Smooth K-Theory.](https://arxiv.org/abs/0707.0046)* In: *[Astérisque](/source/Ast%C3%A9risque).* No. 328 (2009), 45–135 (2010). [ISBN](/source/ISBN_(identifier)) [978-2-85629-289-1](https://en.wikipedia.org/wiki/Special:BookSources/978-2-85629-289-1).

- with Bernhard Hanke and Wolfgang Steimle: *The space of metrics of positive scalar curvature.* [Publications Mathématiques de l'IHÉS](/source/Publications_Math%C3%A9matiques_de_l'IH%C3%89S) 120 (2014), 335–367. [doi](/source/Doi_(identifier)):[10.1007/s10240-014-0062-9](https://doi.org/10.1007%2Fs10240-014-0062-9)

- with Bernhard Hanke: *Enlargeability and index theory.* [Journal of Differential Geometry](/source/Journal_of_Differential_Geometry) 74 (2006), no. 2, 293–320. [Arxiv](https://arxiv.org/abs/math/0403257)

- with Józef Dodziuk, Peter Linnell, [Varghese Mathai](/source/Varghese_Mathai), Stuart Yates: *Approximating L2-invariants and the Atiyah conjecture. Dedicated to the memory of [Jürgen K. Moser](/source/J%C3%BCrgen_K._Moser).* [Communications on Pure and Applied Mathematics](/source/Communications_on_Pure_and_Applied_Mathematics) 56 (2003), no. 7, 839–873. [doi](/source/Doi_(identifier)):[10.1002/cpa.10076](https://doi.org/10.1002%2Fcpa.10076)

- with [Rostislav Grigorchuk](/source/Rostislav_Grigorchuk), Peter Linnell, Andrzej Żuk: *On a question of Atiyah.* [Comptes rendus de l'Académie des Sciences](/source/Comptes_rendus_de_l'Acad%C3%A9mie_des_Sciences) 331 (2000), no. 9, 663–668. [Arxiv](https://arxiv.org/abs/math/0009175)

- with [Wolfgang Lück](/source/Wolfgang_L%C3%BCck): *L 2 {\displaystyle L^{2}} torsion of hyperbolic manifolds of finite volume.* In: *[Geometric and Functional Analysis](/source/Geometric_and_Functional_Analysis).* vol. 9, 1999, pp. 518–567, [Arxiv.](https://arxiv.org/abs/dg-ga/9707009)

- *Integrality of L 2 {\displaystyle L^{2}} Betti numbers*, *[Mathematische Annalen](/source/Mathematische_Annalen)* vol. 317, 2000, pp. 727–750, [Arxiv.](https://arxiv.org/abs/math/0001101)

- *L 2 {\displaystyle L^{2}} -index theorem for elliptic boundary problems*, *[Pacific Journal of Mathematics](/source/Pacific_Journal_of_Mathematics)* vol. 197, 2001, pp. 423–439, [Arxiv.](https://arxiv.org/abs/math/9810133)

## References

1. **[^](#cite_ref-1)** [Thomas Schick](https://mathgenealogy.org/id.php?id=27755) at the [Mathematics Genealogy Project](/source/Mathematics_Genealogy_Project)

1. **[^](#cite_ref-2)** Schick, T.; Linnell, P. (2007). ["Finite group extensions and the Atiyah conjecture"](http://www.uni-math.gwdg.de/schick/publ/extAtiyah.html). *Journal of the American Mathematical Society*. **20** (4): 1003–1061. [arXiv](/source/ArXiv_(identifier)):[math/0403229](https://arxiv.org/abs/math/0403229). [Bibcode](/source/Bibcode_(identifier)):[2007JAMS...20.1003L](https://ui.adsabs.harvard.edu/abs/2007JAMS...20.1003L). [doi](/source/Doi_(identifier)):[10.1090/S0894-0347-07-00561-9](https://doi.org/10.1090%2FS0894-0347-07-00561-9). [S2CID](/source/S2CID_(identifier)) [12160184](https://api.semanticscholar.org/CorpusID:12160184).

1. **[^](#cite_ref-3)** Schick, T. (2000). "Integrality of L 2 {\displaystyle L^{2}} Betti numbers". *Mathematische Annalen*. **317** (4): 727–750. [arXiv](/source/ArXiv_(identifier)):[math/0001101](https://arxiv.org/abs/math/0001101). [doi](/source/Doi_(identifier)):[10.1007/PL00004421](https://doi.org/10.1007%2FPL00004421). [S2CID](/source/S2CID_(identifier)) [59127019](https://api.semanticscholar.org/CorpusID:59127019).

1. **[^](#cite_ref-4)** Schick, T. (2007). ["Finite group extensions and the Baum-Connes conjecture"](https://doi.org/10.2140%2Fgt.2007.11.1767). *Geometry and Topology*. **11** (3): 1767–1775. [arXiv](/source/ArXiv_(identifier)):[math/0209165](https://arxiv.org/abs/math/0209165). [doi](/source/Doi_(identifier)):[10.2140/gt.2007.11.1767](https://doi.org/10.2140%2Fgt.2007.11.1767). [arXiv preprint](https://arxiv.org/abs/math.KT/0209165)

1. **[^](#cite_ref-5)** ["Thomas Schick: Finite group extensions and the Baum-Connes conjecture"](http://www.uni-math.gwdg.de/schick/publ/BC_finite_ext.html). *Schick's website at the University of Gôttingen (uni-math.gwdg.de)*.

1. **[^](#cite_ref-6)** Schick, T. (1998). ["A counterexample to the (unstable) Gromov-Lawson-Rosenberg conjecture"](https://doi.org/10.1016%2Fs0040-9383%2897%2900082-7). *Topology*. **37** (6): 1165–1168. [arXiv](/source/ArXiv_(identifier)):[math/0403063](https://arxiv.org/abs/math/0403063). [doi](/source/Doi_(identifier)):[10.1016/s0040-9383(97)00082-7](https://doi.org/10.1016%2Fs0040-9383%2897%2900082-7). [arXiv preprint](https://arxiv.org/abs/math/0403063)

1. **[^](#cite_ref-7)** ["Neuartige Probleme der Mathematik lösen, Göttingen, Courant Forschungszentrum"](http://www.goettinger-tageblatt.de/Nachrichten/Wissen/Wissen-vor-Ort/Neuartige-Probleme-der-Mathematik-loesen). *Göttinger Tageblatt*. 19 May 2009.

## External links

- [Homepage](https://topologie.math.uni-goettingen.de/tschick/)

- ["Presseinformation: Antrittsvorlesung des Mathematikers Prof. Dr. Thomas Schick"](http://www.uni-goettingen.de/de/3240.html?cid=601). *Georg-August-Universität Göttingen*. 15 January 2002.

Authority control databases International ISNI VIAF GND WorldCat National United States Israel Catalonia Academics ORCID Mathematics Genealogy Project ResearcherID Scopus zbMATH Google Scholar DBLP MathSciNet People DDB Other IdRef

---
Adapted from the Wikipedia article [Thomas Schick](https://en.wikipedia.org/wiki/Thomas_Schick) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Thomas_Schick?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.