Papers/Talks

Upcoming Talks:

  1. UChicago No Boundaries Seminar – Resolvent degree for arithmetic groups and variations of Hodge structures – Dec. 2, 2022

Pre-prints:

  1. Essential Dimension via Prismatic Cohomology (with Benson Farb and Mark Kisin). Submitted for publication.
  2. A higher Kac-Moody extension for two-dimensional gauge groups (with Jens Kaad and Ryszard Nest). Submitted for publication.
  3. Alexander Ostrowski’s”On Dirichlet Series and Algebraic Differential Equations” (with Erik Christian Hansen and Yonathan Stone). English translation of German original.

Publications:

  1. Modular functions and resolvent problems, with an appendix by Nate Harman (with Benson Farb and Mark Kisin). Mathematsche Annalen, 2022, https://doi.org/10.1007/s00208-022-02395-8.
  2. Mathematics and Dance: Notes from an Emerging Interaction (with Reggie Wilson), Notices of the AMS, vol. 68, 2021, no. 11, 1926-1929.
  3. The Essential Dimension of Congruence Covers (with Benson Farb and Mark Kisin), Compositio Mathematica, 157(11), 2407-2432. doi:10.1112/S0010437X21007594.
  4. A Generalized Contou-Carrere Symbol and its Reciprocity Laws in Higher Dimensions (with Oliver Braunling and Michael Groechenig). Transactions of the AMS, Ser. B vol. 8, 2021, 679-753.
  5. Problems in Arithmetic Topology (with Claudio Gomez-Gonzales). Research in the Mathematical Sciences, vol. 8, 2021, article 23, 14 pp.
  6. Tschirnhaus Transformations after Hilbert, L’Enseignement Mathematique, vol. 66, 2020, no. 3, pp. 489-540.
  7. Resolvent degree, Hilbert’s 13th Problem and Geometry (with Benson Farb). L’Enseignement Mathematique, vol. 65, 2019, no. 3/4, pp. 303-376.
  8. Derived \ell-adic zeta functions (with Jonathan Campbell and Inna Zakharevich). Advances in Mathematics, vol. 354, 2019, article 106760, 53 pp.
  9. Hochschild coniveau spectral sequence and the Beilinson residue (with Oliver Braunling). Pacific Journal of Mathematics, vol. 300, no. 2, 2019, pp. 257-329.
  10. Coincidences of homological densities, predicted by arithmetic (with Benson Farb and Melanie Matchett Wood). Advances in Mathematics, vol. 352, 2019, pp. 670-716.
  11. The A_\infty-Structure of the Index Map (with Oliver Braunling and Michael Groechenig). Annals of K-Theory, vol. 3, no. 4, 2018, pp. 581–614.
  12. Etale homological stability and arithmetic statistics (with Benson Farb). Quarterly Journal of Mathematics, vol. 69, no. 3, 2018, pp. 951–974.
  13. On the normally ordered tensor product and duality for Tate objects (with Oliver Braunling, Michael Groechenig and Aron Heleodoro). Theory and Applications of Categories, vol. 33, 2018, pp. 296-349.
  14. The Index Map in Algebraic K-Theory (with Oliver Braunling and Michael Groechenig). Selecta Mathematica, vol. 24, no. 2, 2018, pp. 1039-1091.
  15. Resolvent degree, Hilbert’s 13th problem and geometry (with Benson Farb). “Topology of Arrangements and Representation Stability”, Oberwolfach Research Reports, no. 2, 2018, pp. 84–87.
  16. Topology and arithmetic of resultants, II: the resultant = 1 hypersurface (with an appendix by C. Cazanave) (with Benson Farb). Algebraic Geometry, vol. 4, no. 3, 2017, pp. 337-352.
  17. Relative Tate Objects and Boundary Maps in the K-Theory of Coherent Sheaves (with Oliver Braunling and Michael Groechenig). Homology, Homotopy and Applications, vol. 19, no. 1, 2017, pp. 341-369.
  18. Modular Operads of Embedded Curves (with Satoshi Kondo and Charles Siegel). Geometry & Topology, vol. 21, no. 2, 2017, pp. 903-922.
  19. Operator Ideals in Tate Objects (with Oliver Braunling and Michael Groechenig). Mathematical Research Letters, vol. 23, no. 6, 2016, pp. 1565-1631.
  20. Coincidences of homological densities, predicted by arithmetic (with Benson Farb and Melanie Matchett Wood). “Topologie”, Oberwolfach Research Reports, vol. 16, no. 3, 2016, pp. 2041-2043.
  21. Geometric and Analytic Structures on the Higher Adeles (with Oliver Braunling and Michael Groechenig). Research in the Mathematical Sciences, Special Collection in Celebration of the Research of Fedor Bogomolov on the Occasion of his 70th Birthday, vol. 3, no. 1, 2016, article 22.
  22. Topology and arithmetic of resultants, I (with Benson Farb). New York Journal of Mathematics, vol. 22, 2016, pp. 801-821
  23. Tate Objects in Exact Categories (with an appendix by J. Stovicek and J. Trlifaj)  (with Oliver Braunling and Michael Groechenig). Moscow Mathematical Journal, vol. 16, no. 3, 2016, pp. 433-504.
  24. Descent for n-Bundles. Advances in Mathematics, vol. 288, 2016, pp. 527-575.

In Preparation:

  1. Lie’s Third Theorem for L_\infty-algebras (with Chris Rogers)
  2. The Resolvent Degree of Arithmetic Groups, Variations of Hodge Structure, and Related Moduli Problems (with Benson Farb and Mark Kisin).
  3. Derived motivic integration (with Oliver Braunling, Michael Groechenig and Inna Zakharevich)

Research Talks:

  1. Reggie Wilson/Fist and Heel Performance Group Symposium @ Lynden Sculpture Garden, WI  – Session 3 – TRANSDISCIPLINARY – What Can Dance Do For the World? – Aug. 14, 2022
  2. ICERM Workshop on Braids in Symplectic and Algebraic Geometry, March 21-25, 2022
  3. Getzler Festschrift, March 21-25, 2022
  4. Michigan Algebraic Geometry Seminar – Essential dimension via prismatic cohomology, Feb. 9, 2022
  5. Gottingen Higher Structures Seminar – Lie Theory for L_\infty-algebras, Dec. 1, 2021.
  6. Caltech Algebra and Geometry Seminar – Essential dimension via prismatic cohomology, Nov. 8, 2021.
  7. Algebraic Groups and Algebraic Geometry (Conference in honor of Zinovy Reichstein’s 60th Birthday) – Essential Dimension via Prismatic Cohomology – June 29, 2021
  8. 2021 Spring Western AMS Sectional Special Session on Connections between homotopical algebra and geometry – Lie theory for L_\infty-algebras – May 1-2, 2021
  9. Seminario nacional de geometría algebraica EN LÍNEA – The Geometry of Hilbert’s 13th Problem – April 14, 2021
  10. UGA Algebraic Geometry Seminar – The Geometry of Hilbert’s 13th Problem – March 3, 2021
  11. UNR Topology Seminar – The Geometry of Hilbert’s 13th Problem – Sept. 25, 2020
  12. UNR Colloquium – Braids, Polynomials and Hilbert’s 13th Problem – Sept. 24, 2020
  13. Northwestern Geometry & Physics Seminar – The Geometry of Hilbert’s 13th Problem, May 28, 2020.
  14. Spring Southeastern AMS Sectional, Special Session on Motivic Aspects of Topology and Geometry – Derived motivic integration, March 13, 2020 (CANCELLED DUE TO COVID-19)
  15. IAS – Special Seminar on Hilbert’s 13th Problem, Dec. 5 – 6
  16. UCSB Topology Seminar – Braids, Polynomials and Hilbert’s 13th, April 2, 2019
  17. IPAM – Braids, Polynomials and Hilbert’s 13th Problem, Feb. 19-21, 2019
    1. After Abel, Feb. 19, 2019
    2. Resolvent Degree and Classical Solutions, Feb. 19, 2019
    3. Resolvent Degree and the Search for Lower Bounds, Feb. 21, 2019
  18. Tufts Colloquium – Braids, Polynomials and Hilbert’s 13th Problem, Feb. 1, 2019.
  19. Michigan Topology Seminar – Topological Invariants of Algebraic Functions, Jan. 10, 2019.
  20. UCR Topology Seminar – The Geometry of Hilbert’s 13th Problem, Nov. 8, 2018
  21. USC Colloquium – Braids, Polynomials and Hilbert’s 13th Problem, Sept. 26, 2018
  22. Michigan Representation Stability Conference, Aug. 13-17, 2018
  23. UCI Algebra Seminar – The Geometry of Hilbert’s 13th Problem, May 30, 2018
  24. Stanford Topology Seminar – The Theory of Resolvent Degree, after Hamilton, Klein, Sylvester, Hilbert and Brauer, May 22, 2018
  25. UCLA Algebra Seminar – The Theory of Resolvent Degree, after Hamilton, Klein, Sylvester, Hilbert and Brauer, May 18, 2018
  26. Caltech Algebra & Geometry Seminar – The Theory of Resolvent Degree, after Hamilton, Klein, Sylvester, Hilbert and Brauer, May 14, 2018
  27. CCR – The Theory of Resolvent Degree, after Hamilton, Klein, Sylvester, Hilbert and Brauer, April 26, 2018
  28. USC Tuesday Seminar  – The Geometry of Hilbert’s 13th Problem, April 24, 2018
  29. USC Algebra Seminar – The Theory of Resolvent Degree, after Hamilton, Klein, Sylvester, Hilbert and Brauer, April 23, 2018
  30. UChicago Colloquium – Braids, Polynomials and Hilbert’s 13th Problem, April 11, 2018
  31. Harvard Number Theory Seminar – The Theory of Resolvent Degree, after Hamilton, Klein, Hilbert and Brauer, March 7, 2018
  32. Harvard Informal Geometry and Dynamics Seminar – The Geometry of Hilbert’s 13th Problem, March 7, 2018
  33. UC Irvine Colloquium – Braids, Polynomials and Hilbert’s 13th Problem, March 1, 2018
  34. Kempner Colloquium – Algebraic Topology and Hilbert’s 13th Problem(s), Boulder, CO, Jan. 30, 2018
  35. Boulder Topology Seminar – Coincidences of homological densities, predicted by arithmetic, Boulder, CO, Jan. 30, 2018
  36. Oberwolfach  Workshop “Topology of Arrangements and Representation Stability” – The theory of resolvent degree, after Hamilton, Sylvester, Hilbert, Segre and Brauer, Oberwolfach, Germany, Jan. 14-20, 2018
  37. UMN Topology Seminar -The theory of resolvent degree, after Hamilton, Sylvester, Hilbert, Segre and Brauer – Twin Cities, MN, Dec. 8, 2017
  38. UCSD Number Theory Seminar – The theory of resolvent degree, after Hamilton, Sylvester, Hilbert, Segre and Brauer – San Diego, USA, Nov. 30, 2017
  39. UBC Topology Seminar – Coincidences of homological densities, predicted by arithmetic – Vancouver, Canada, Nov. 8, 2017
  40. UBC Algebraic Geometry Seminar – The theory of resolvent degree, after Hamilton, Sylvester, Hilbert, Segre and Brauer – Vancouver, Canada, Nov. 6, 2017
  41. No Boundaries – Groups in Algebra, Geometry and Topology – The theory of resolvent degree, after Hamilton, Sylvester, Hilbert, Segre and Brauer – Chicago, USA, Oct. 26-29, 2017
  42. Manifolds and Groups – Coincidences of homological densities, predicted by arithmetic – Regensburg, Germany, Sept. 25-29, 2017
  43. UCLA Number Theory Seminar – Coincidences of homological densities, predicted by arithmetic – Jan. 25, 2017
  44. UCI Number Theory Seminar – Coincidences of homological densities, predicted by arithmetic – Jan. 23, 2017
  45. Notre Dame Topology Seminar – Coincidences of homological densities, predicted by arithmetic – Dec. 8, 2016
  46. University of Chicago Geometry/Topology Seminar – Coincidences of homological densities, predicted by arithmetic – Sept. 29, 2016
  47. 2016 Oberwolfach Topology Meeting – Coincidences of homological densities, predicted by arithmetic – July 21, 2016
  48. 27th Nordic Congress of Mathematicians, Geometry and Topology Session – Counting Problems and Homological Stability – March 17, 2016
  49. Purdue Topology Seminar – Counting Problems and Homological Stability – March 2, 2016
  50. Wayne State Colloquium – Polynomials, Counting Problems and Algebraic Topology – February 22, 2016
  51. IBS-CGP Conference on Homotopical Methods in Quantum Field Theory – Higher Determinants and Double Loop Groups – January 13, 2016
  52. Minnesota Topology Seminar – Counting Problems and Homological Stability – October 26, 2015
  53. Rice Topology Seminar – Counting Problems and Homological Stability – October 19, 2015
  54. Northwestern Topology Seminar – Counting Problems and Homological Stability – October 12, 2015
  55. 2015 AMS Summer Institute in Algebraic Geometry – Topology and Arithmetic of Resultants – July 27, 2015
  56. Midwest Topology Seminar – Topology and Arithmetic of Spaces of Rational Maps – May 10, 2015
  57. Wisconsin Number Theory Seminar – Geometry and Arithmetic of Spaces of Rational Maps – May 7, 2015
  58. UIC Homotopy Algebras Seminar – Modular Operads of Embedded Curves – April 17, 2015
  59. 2015 Arkansas Spring Lecture Series – Spaces of Rational Functions, Representation Stability, and Statistics over Finite Fields – March 5, 2015
  60. Rutgers Algebra Seminar – The Index Map and Reciprocity Laws for Contou-Carrere Symbols – Feb. 4, 2015
  61. Yale Geometry, Symmetry and Physics Seminar – The Index Map and Reciprocity Laws for Contou-Carrere Symbols – Feb. 2, 2015
  62. MIT – Topology Seminar – The Index Map and Reciprocity Laws – Nov. 17, 2014
  63. University of Tokyo – Topology Seminar – The Index Map and Reciprocity Laws for Contou-Carrere Symbols – July 22, 2014
  64. IPMU – Get Together Seminar – A Modular Operad of Embedded Curves – July 3, 2014
  65. Imperial College London MAGIC Seminar – Index Theory and Reciprocity Laws – February 26, 2014
  66. Padua Winter School and Workshop on Higher Structures in Algebraic Analysis – The Index Map in Algebraic K-Theory – February 18, 2014
  67. University of Copenhagen Algebra/Topology Seminar – Index Theory and Reciprocity Laws – December 17, 2013
  68. Nagoya University K-Theory Seminar – Index Theory in Algebraic K-Theory -December 12, 2013
  69. Chuo University – K-Theory Seminar – Index Theory in Algebraic K-Theory – December 3, 2013
  70. IPMU – Get-Together Math Seminar – Index Theory in Algebraic K-Theory and Algebraic Geometry – October 10, 2013
  71. Northwestern Mini-Conference – Determinants, Delooping and Reciprocity – June 12, 2013
  72. Northwestern – Topology Seminar – Descent for n-Bundles – June 3, 2013
  73. Paris – Institute de Mathematiques de Jussieu – Seminaire d’Analyse Algebrique – Descent for n-Bundles – May 21, 2013
  74. Utrecht – Descent for n-Bundles – May 17, 2013
  75. Oxford – Algebraic and Symplectic Geometry Seminar – Descent for n-Bundles – May 7, 2013
  76. EPFL – Topology Seminar – Determinants and Delooping of Algebraic K-Theory – May 3, 2013
  77. EPFL – Geometry Seminar – Determinants, Delooping and Reciprocity – May 1, 2013
  78. Max Planck Institute for Mathematics – Higher Differential Geometry Seminar – “Descent for n-bundles” – April 24, 2013
  79. University of British Columbia – Algebraic Geometry Seminar – “Strictifying Higher Bundles” – Oct. 29, 2012
  80. Notre Dame – Topology Seminar – “Extensions of Lie n-Groups”  – Sept. 27, 2012
  81. 2012 ESI Program on K-Theory and Quantum Fields – “Extensions of Lie n-Groupoids by Strict Lie n-Groups” – June 14, 2012

Other Talks:

  1. IPMU Special Seminar – Nerves and Group Completion for Categories and Operads, A Beginner’s Guide, Parts 1-3 – Aug. 29, Sept. 1 and Sept. 2, 2014
  2. IPMU Conformal Blocks Seminar – Loop Groups and Conformal Blocks – Nov. 19, 2013
  3. MIT Babytop – The Structure of Higher Bundles – Nov. 27, 2012
  4. 2012 Simons Center Graduate Workshop on SUSY Field Theories  – Supermanifolds – March 6, 2012
  5. 2011 Talbot Workshop – Principal Bundles, Real Structures, Toledo Invariant and Milnor-Wood – May 2, 2011
  6. Northwestern Graduate Seminar – The Chern-Weil Construction – April 21, 2011
  7. Northwestern Graduate Seminar – Symmetries of Spaces and Bundles – Jan. 20, 2011
  8. Northwestern Graduate Seminar – Spin Structures – Oct. 7, 2010
  9. Discrete and Continuous Geometries, Northwestern Conference for Undergraduates – The Euler Characteristic – June 23, 2010
  10. 2010 Talbot Workshop – Complex K-Theory – May 23, 2010
  11. Northwestern Graduate Seminar – Introduction to Complex K-Theory – May 18, 2010

Posters:

  1. Newton Institute’s Higher Structure 2013: Operads and Deformation Theory – “Mapping Spaces in Higher Stacks, and Applications” – April 2, 2013