LAMZOURI Youness

Position Full professor
Teaching department
Faculté des Sciences et Technologies
Research group Analysis and Number Theory
Research fields

Analytic Number Theory

Keywords
  • Character sums and exponential sums
  • The Riemann zeta function and L-functions
  • The distribution of prime numbers
  • Additive and multiplicative functions
  • Class numbers of quadratic fields
  • Random multiplicative functions
Mail

IECL – Site de Nancy
Faculté des sciences et Technologies
Campus, Boulevard des Aiguillettes
54506 Vandœuvre-lès-Nancy

Email youness.lamzouri@univ-lorraine.fr
Phone number 03 73 74 54 47
Office 402

I am a Professor of Mathematics at the Institut Elie Cartan de Lorraine (IECL) of the Université de Lorraine in Nancy, France.

I am also a Junior Member (laureate of a Fundamental Chair) of the Institut Universitaire de France (IUF).

Before joining the Institut Elie Cartan de Lorraine in 2018, I was an Associate Professor at York University in Toronto, Canada, where I remained from 2012 to 2018. From 2009 to 2012, I had postdoctoral positions at the Institute for Advanced Study in Princeton, USA, and the University of Illinois at Urbana-Champaign, Urbana, USA.

I received my PhD in 2009 from the University of Montreal under the supervision of Andrew Granville.  My thesis “Sur la distribution des valeurs de la fonction zêta de Riemann et des fonctions L au bord de la bande critique” has received the 2011 Blair Spearman Doctoral Prize from the Canadian Mathematical Society.

My research interests are in analytic and probabilistic number theory. I am interested in various questions concerning character sums and exponential sums, the theory of the Riemann zeta function and L-functions, prime number races, class numbers of quadratic fields, Fourier coefficients of modular forms, as well as random multiplicative functions.

Currently, I am on the editorial boards of the following journals:

I co-organize the Nancy-Metz Number Theory Seminar, and I am the organizer of the Mathematics Colloquium at the IECL, Nancy.

Personal: 

  • Born in 1983.
  • Citizenship : Canada and Morocco.

Academic positions:

Education:

Awards and Honours:

44. (With Oleksiy Klurman and March Munsch) Sign changes of short character sums and real zeros of Fekete polynomials. Preprint, 45 pages. [arXiv]

43. (With Oleksiy Klurman and March Munsch) Lq norms and Mahler measure of Fekete polynomials. Submitted, 24 pages. [arXiv]

42. (With Ayesha Hussain) The limiting distribution of Legendre paths. To appear in Journal de l’École polytechnique, 23 pages. [arXiv]

41. An effective Linear Independence conjecture for the zeros of the Riemann zeta function and applications. To appear in the Springer volume: “Essays in Analytic Number Theory: In Honor of Helmut Maier’s 70th Birthday”,  19 pages. [arXiv]

40. The distribution of large quadratic character sums and applications. To appear in Algebra and Number Theory, 43 pages. [arXiv]

39. (With Y. Lee) The number of zeros of linear combinations of L-functions near the critical line. To appear in Journal d’Analyse Mathématique, 56 pages. [arXiv]

38. (With A. Languasco) Small values of $|L’⁄L(1, χ)|$. Experimental Mathematics. Vol. 32 (2023), no.2, 362–377. [arXiv]

37. (with M. Gerspach) Low pseudomoments of Euler products. The Quarterly Journal of Mathematics, Vol. 73 (2022), no. 2, 517–537. 21 pages. [arXiv]

36.  (With Alexander P. Mangerel) Large odd order character sums and improvements of the Pólya-Vinogradov inequality. Transactions of the American Mathematical Society. Vol. 75 (2022), no. 6, 3759–3793. [arXiv]

35. (with A. Granville) Large deviations of sums of random variables. Lithuanian Mathematical Journal (Kubilius Centenary issue), Vol. 61 (2021), no. 3, 345–372. [arXiv]

34. Zeros of the Epstein zeta function to the right of the critical line. Mathematical Proceedings of the Cambridge Philosophical Society. Vol. 171 (2021), no. 2, 265–276. [arXiv]

33. (With P. Autissier and D. Bonolis) The distribution of the maximum of partial sums of Kloosterman sums and other trace functions. Compositio Mathematica, Vol. 157 (2021), no. 7, 1610–1651. [arXiv]

32. On the distribution of the maximum of cubic exponential sums. Journal of the Institute of Mathematics of Jussieu. Vol. 19 (2020), no. 4, 1259-1286. [arXiv]

31. (With Stephen Lester and Maksym Radziwill) Discrepancy bounds for the distribution of the Riemann zeta function and applications. Journal d’Analyse Mathématique Vol. 139 (2019), no. 2, 453-494. [arXiv]

30. (With Bruno Martin) On the race between primes with an odd versus an even sum of the last $k$ binary digits. Functiones et Approximatio Commentarii Mathematici Vol. 61 (2019), no. 1, 7-25.

29. (With Kevin Ford and Adam Harper) Extreme biases in prime number races with many contestants. Mathematishe Annalen. Vol. 374 (2019), no. 1-2, 517-551. [arXiv]

28. Large sums of Hecke eigenvalues of holomorphic cusp forms. Forum Mathematicum. Vol. 31 (2019), no. 2, 403-417. [arXiv]

27. (With Stephen Lester and Maksym Radziwill) An effective universality theorem for the Riemann zeta function. Commentarii Mathematici Helvetici. Vol. 93 (2018), no. 4, 709–736. [arXiv]

26. (With Alex Dahl) The distribution of class numbers in a special family of real quadratic fields. Transactions of the American Mathematical Society. Vol. 370 (2018), no. 9, 6331-6356. [arXiv]

25. (With Régis de la Bretèche and Gérald Tenenbaum) Inégalité de Turán-Kubilius friable et indépendance asymptotique. Acta Arithmetica. Vol. 183 (2018), no. 2, 191-199. [arXiv]

24. (With Adam Harper) Orderings of weakly correlated random variables, and prime number races with many contestants. Probability Theory and Related Fields. Vol. 170 (2018), no. 3-4, 961-1010. [arXiv]

23. The number of imaginary quadratic fields with prime discriminant and class number up to $H$. The Quarterly Journal of Mathematics Vol. 68 (2017), no. 4, 1379-1393.  [arXiv]

22. On the average of the number of imaginary quadratic fields with a given class number. The Ramanujan Journal Vol. 44 (2017), no. 2, 411-416. [arXiv]

21. Large moments and extreme values of class numbers of indefinite binary quadratic forms. Mathematika Vol. 63 (2017), no. 2, 564-586. [arXiv]

20. Large values of $L(1, \chi)$ for $k$-th order characters $\chi$, and applications to character sums. Mathematika Vol. 63 (2017), no. 1, 53-71. [arXiv]

19. A bias in Mertens’s product formula. International Journal of Number Theory Vol. 12 (2016), no. 1, 97-109. [arXiv]

18. Extreme values of class numbers of real quadratic fields. International Mathematics Research Notices IMRN 2015, no. 22, 11847-11860. [arXiv]

17. The distribution of Euler-Kronecker constants of quadratic fields. Journal of Mathematical Analysis and Applications Vol. 432 (2015), no. 2, 632-653. [arXiv]

16. (With Xiannan Li and Kannan Soundararajan) Conditional bounds for the least quadratic non-residue and related problems. Mathematics of Computation Vol. 84 (2015), no. 295, 2391-2412. [arXiv]

15. (With Leo Goldmakher) Large even order character sums. Proceedings of the American Mathematical Society Vol. 142 (2014), 2609-2614. [arXiv]

14. (With Kevin Ford and Sergei Konyagin) The prime number race and zeros of Dirichlet L-functions off the critical line: Part III. Quarterly Journal of Mathematics Vol. 64 (2013), no. 4, 1091-1098. [arXiv]

13. The distribution of short character sums. Mathematical Proceedings of the Cambridge Philosophical Society Vol. 155 (2013), no. 2, 207-218. [arXiv]

12. Prime number races with three or more competitors. Mathematische Annalen Vol. 356 (2013), no. 3, 1117-1162. [arXiv]

11. (With Leo Goldmakher) Lower bounds on odd order character sums. International Mathematics Research Notices IMRN (2012), no. 21, 5006-5013. [arXiv]

10. The Shanks-Rényi prime number race with many contestants. Mathematical Research Letters Vol. 19 (2012), no. 03, 649-666. [arXiv]

9. (With Alexandru Zaharescu) Randomness of character sums modulo $m$. Journal of Number Theory Vol. 132 (2012), no. 12, 2779-2792. [arXiv]

8. Large deviations of the limiting distribution in the Shanks-Rényi prime number race. Mathematical Proceedings of the Cambridge Philosophical Society Vol. 153 (2012), 147-166. [arXiv]

7. On the distribution of extreme values of zeta and L-functions in the strip $1/2<\sigma<1$. International Mathematics Research Notices IMRN 2011, no. 23, 5449-5503. [arXiv]

6. (With M. Tip Phaovibul and Alexandru Zaharescu) On the distribution of the partial sum of Euler’s totient function in residue classes. Colloquium Mathematicum Vol. 123 (2011), 115-127.

5. Extreme values of $\arg L(1, \chi)$. Acta Arithmetica Vol. 146 (2011), 335-354. [arXiv]

4. Distribution of values of L-functions at the edge of the critical strip. Proceedings of the London Mathematical Society (3) 100 (2010), no. 3, 835-863. [arXiv]

3. The two dimensional distribution of values of $\zeta(1+it)$. International Mathematics Research Notices IMRN (2008) Vol. 2008, article ID rnn106, 48 pp. [arXiv]

2. On the number of linear forms in logarithms. Journal of Number Theory Vol. 125 (2007), 247-253. [arXiv]

1.  Smooth values of the iterates of the Euler Phi function. Canadian Journal of Mathematics Vol. 59, No. 1 (2007), 127-147. [arXiv]

  • Workshop on Continued fractions : multifractal and dynamical aspects, CIRM, Marseille. September 25-28, 2023.
  • Mahler Measures of Polynomials : An international conference on the occasions of Mahler’s 120th birthday and 90 years of Lehmer’s problem, Radboud University, Nijmegen, Netherlands. October 24-27, 2023.
  • 4th International Congress on Algebra, Number Theory and their applications, Oujda, Morocco. November 2-4, 2023.
  • Research visit, Centre de Recherches Mathématiques (CRM), Montréal, Canada. November 15th, 2023 to January 10th 2024.
  • Mathematics Seminar, Université Polytechnique Hauts-de-France, January 25th, 2024.
  • Research visit, Université Cadi Ayyad, Marrakech, Morocco. March 17-23, 2024.
  • Comparative Prime Number Theory Symposium, UBC, Vancouver, Canada. June 17-21, 2024.