# Schedule for: 18w5053 - Special Values of Automorphic L-functions and Associated p-adic L-Functions

Arriving in Oaxaca, Mexico on Sunday, September 30 and departing Friday October 5, 2018

Sunday, September 30 | |
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14:00 - 23:59 | Check-in begins (Front desk at your assigned hotel) |

19:30 - 22:00 | Dinner (Restaurant Hotel Hacienda Los Laureles) |

20:30 - 21:30 | Informal gathering (Hotel Hacienda Los Laureles) |

Monday, October 1 | |
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07:30 - 08:50 | Breakfast (Restaurant at your assigned hotel) |

08:50 - 09:00 | Introduction and Welcome (Conference Room San Felipe) |

09:00 - 10:15 |
Tadashi Ochiai: Overview Introduction ↓ In this talk, we will formulate the conjectural framework of the conjecture on the existence of the cyclotomic p-adic L-function. First, we will introduce Hasse-Weil L-function for motives. Then we discuss the critical condition of motives and the algebraicity of special values as well as some fundamental conditions which should be essential to discuss p-adic properties of special values. After, we introduce some basic languages of Iwasawa algebra and measures, we will state the conjecture on the existence of of the cyclotomic p-adic L-function which was formulated thanks to Coates–Perrin-RIou and some others.
(Conference Room San Felipe) Related references: [De72] P. Deligne, Valeurs de fonctions L et p ́eriodes d’int ́egrales, Automorphic forms, repre- sentations and L-functions, Proc. Sympos. Pure Math., XXXIII Part 2, Amer. Math. Soc., Providence, R.I., pp. 247–289, 1979. [CP89] J. Coates, B. Perrin-Riou, On p-adic L-functions attached to motives over Q, Algebraic number theory, pp. 23–54, Adv. Stud. Pure Math., 17, Academic Press, 1989. |

10:15 - 10:45 | Coffee Break (Conference Room San Felipe) |

10:45 - 12:00 |
Vinayak Vatsal: Cyclotomic p-adic L-function for GL(2)Q: Modular Symbol Construction ↓ We will describe the now-classical method of constructing p-adic L-functions for GL(2, Q) based on modular symbols. The ideas of this method go back to Manin, Mazur, and Swinnerton-Dyer, as well as many others. (Conference Room San Felipe) |

12:00 - 12:20 | Group Photo (Hotel Hacienda Los Laureles) |

12:20 - 14:00 | Lunch (Restaurant Hotel Hacienda Los Laureles) |

14:00 - 15:00 |
Jacques Tilouine: Integral period relations and the Bloch–Kato formula for quadratic twists of the adjoint L-function ↓ In a joint work with E. Urban, we prove under mild assumptions Integral Period Re- lations for the quadratic base change of a modular form and we compute the relative congruence number in terms of the value at s = 1 of a quadratic twist of the adjoint L-function. This proves a conjecture of Hida (1999). It also implies, under standard Taylor-Wiles type assumptions, in the real quadratic case, resp. in the imaginary quadratic case, the Bloch-Kato formula, resp. an analogue of it. This analogue would be the exact conjectural Bloch-Kato formula if a Bianchi period defined by E. Urban in his thesis could be related to a Bloch-Kato-Beilinson regulator.
(Conference Room San Felipe) Related references: S. Bloch, K. Kato: Grothendieck Festschrift vol I, Birkhauser pp 333-400, 1990 H. Hida: Non-critical values of adjoint L-functions for SL(2), Proc. Symp. Pure Math. 66 (1999) Part I, 123-175 |

15:00 - 15:30 | Coffee Break (Conference Room San Felipe) |

15:30 - 16:30 |
Shinichi Kobayashi: Cyclotomic p-adic L-function for GL(2)Q: Rankin-Selberg Construction. ↓ I explain the classical construction of the cyclotomic p-adic L-function of elliptic mod- ular forms by the Rankin-Selberg method.
(Conference Room San Felipe) Related references: 1. G. Shimura, The special values of the zeta functions associated with cusp forms. Comm. Pure Appl. Math. 29 (1976), no. 6, 783–804. 2. H. Hida, Elementary theory of L-functions and Eisenstein series. London Mathematical So- ciety Student Texts, 26. Cambridge University Press, Cambridge, 1993. xii+386 pp. 3. A. Panchishkin, Two variable p-adic L functions attached to eigenfamilies of positive slope. Invent. Math. 154 (2003), no. 3, 551–615. 4. S. Kobayashi, The p-adic Gross-Zagier formula for elliptic curves at supersingular primes. Invent. Math. 191 (2013), no. 3, 527–629. |

16:30 - 17:00 | Break (Conference Room San Felipe) |

17:00 - 18:00 |
Masaaki Furusawa: Refined global Gross-Prasad conjecture on special Bessel periods and Boecherer ’s con- jecture ↓ This is a joint work with Kazuki Morimoto. In this talk, first we plan to give an outline of the proof of the refined global Gross-Parasd conjecture for special Bessel periods on SO(2n+1). Then we discuss about its consequence to Boecherer ’s conjecture concerning the Fourier coefficients of the Siegel cusp forms of degree two which are Hecke eigenforms.
(Conference Room San Felipe) Related references: The followings are links to the papers related to this talk. https://arxiv.org/abs/1611.05567 https://doi.org/10.1007/s00208-016-1440-z |

18:00 - 20:00 | Dinner (Restaurant Hotel Hacienda Los Laureles) |

Tuesday, October 2 | |
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07:30 - 09:00 | Breakfast (Restaurant at your assigned hotel) |

09:00 - 10:15 |
Kenichi Namikawa: P-adic L-function for GL(n + 1) × GL(n) I ↓ A construction of p-adic L-functions for GL(2) via the modular symbol method is reviewed in this talk. I will summarize some technical points of the construction comparing with the works of F. Januszewski on p-adic L-functions for GL(n + 1) × GL(n). In particular, the behavior under the Tate twists is emphasized in the talk, since it is the most important new ingredient in Januszewski’s recent preprint.
(Conference Room San Felipe) Related references (for talks I to IV): (Main) F.Januszewski. Non-abelian p-adic Rankin-Selberg L-functions and non-vanishing of central L- values, arXiv:1708.02616, 2017. K. Namikawa. On p-adic L-functions associated with cusp forms on GL2. manuscr. math. 153, pages 563–622, 2017. (Sub) B.J. Birch. Elliptic curves over Q, a progress report. 1969 Number Theory Institute. AMS Proc. Symp. Pure Math. XX, 396–400, 1971. M. Dimitrov. Automorphic symbols, p-adic L-functions and ordinary cohomology of Hilbert modular varieties. Amer. J. Math. 135, 1117–1155, 2013. F. Januszewski. Modular symbols for reductive groups and p-adic Rankin-Selberg convolutions over number fields, J. Reine Angew. Math. 653, 1–45, 2011. F. Januszewski. On p-adic L-functions for GL(n)×GL(n−1) over totally real fields, Int. Math. Res. Not., Vol. 2015, No. 17, 7884–7949. F. Januszewski. p-adic L-functions for Rankin-Selberg convolutions over number fields, Ann. Math. Quebec 40, special issue in Honor of Glenn Stevens ’60th birthday, 453–489, 2016. F. Januszewski. On period relations for automorphic L-functions I. To appear in Trans. Amer. Math. Soc., arXiv:1504.06973 H. Kasten and C.-G. Schmidt. On critical values of Rankin-Selberg convolutions. Int. J. Number Theory 9, pages 205–256, 2013. D. Kazhdan, B. Mazur, and C.-G. Schmidt. Relative modular symbols and Rankin-Selberg convolutions, J. Reine Angew. Math. 512, 97–141, 2000. K. Kitagawa. On standard p-adic L-functions of families of elliptic cusp forms, p-adic mon- odromy and the Birch and Swinnerton-Dyer conjecture (B. Mazur and G. Stevens, eds.), Con- temp. Math. 165, AMS, 81–110, 1994. J.I. Manin. Non-archimedean integration and p-adic Hecke-Langlands L-series. Russian Math. Surveys 31, 1, 1976. B. Mazur, and P. Swinnerton-Dyer. Arithmetic of Weil Curves, Invent. Math. 25, 1–62, 1974. B. Mazur, J. Tate, and J. Teitelbaum. On p-adic analogues of the conjectures of Birch and Swinnerton-Dyer, Invent. Math. 84, 1–48, 1986. C.-G. Schmidt. Relative modular symbols and p-adic Rankin-Selberg convolutions, Invent. Math. 112, 31–76, 1993. C.-G. Schmidt. Period relations and p-adic measures, manuscr. math. 106, 177–201, 2001. B. Sun. The non-vanishing hypothesis at infinity for Rankin-Selberg convolutions. J. Amer. Math. Soc. 30, pages 1–25, 2017. A. Raghuram. On the Special Values of certain Rankin-Selberg L-functions and Applications to odd symmetric power L-functions of modular forms. Int. Math. Res. Not. 2010, 334–372, 2010. A. Raghuram. Critical values for Rankin-Selberg L-functions for GL(n) × GL(n − 1) and the symmetric cube L-functions for GL(2). Forum Math. 28, 457–489, 2016. |

10:15 - 10:45 | Coffee Break (Conference Room San Felipe) |

10:45 - 12:00 |
Fabian Januszewski: P-adic L-function for GL(n + 1) × GL(n) II ↓ In this talk I will give a quick overview of the analytic theory of Rankin-Selberg L-functions for GL(n+1) x GL(n) due to Jacquet, Piatetski-Shapiro and Shalika, which are the L-functions of interest in this lecture series. Subsequently I will introduce the modular symbol of Schmidt, Kazhdan-Mazur-Schmidt, Kasten-Schmidt, Raghuram and myself and explain its relation to special values of Rankin-Selberg L-functions and the archimedean non-vanishing hy- pothesis established by Sun. (Conference Room San Felipe) |

12:00 - 14:00 | Lunch (Restaurant Hotel Hacienda Los Laureles) |

14:00 - 15:00 |
Haruzo Hida: Galois Deformation Ring and Base Change to a Quadratic Field. ↓ Consider the universal minimal p-ordinary deformation rT into GL(2, T ) (for a prime p ≥ 5) of a modulo p induced representation from a quadratic field F. For almost all primes p split in F, we describe how to determine T as an algebra over the weight Iwasawa algebra Λ as an extension of degree 1,2,3. This implies that the Pontryagin dual of the adjoint Selmer group of rT is isomorphic to Λ/(Lp) as Lambda-modules for an explicit power series Lp. (Conference Room San Felipe) |

15:00 - 15:30 | Coffee Break (Conference Room San Felipe) |

15:30 - 16:30 |
Alexei Pantchichkine: Constructions of p-adic L-functions and admissible measures for Hermitian modular forms. ↓ For a prime p and a positive integer n, the standard zeta function LF (s) is consid-
ered, attached to an Hermitian modular form F = ∑ A(H)qH on the Hermitian upper half H
plane Hm of degree n, where H runs through semi-integral positive definite Hermitian matrices of degree n, i.e. H ∈ Λm(O) over the integers O of an imaginary quadratic field K, where qH = exp(2πiTr(HZ)). Analytic p-adic continuation of their zeta functions constructed by A.Bouganis in the ordinary case, is extended to the admissible case via growing p-adic measures. Previously this problem was solved for the Siegel modular forms. Main result is stated in terms of the Hodge polygon PH(t) : [0,d] → R and the Newton polygon PN(t) = PN,p(t) : [0,d] → R of the zeta function LF (s) of degree d = 4n. Main theorem gives a p-adic analytic interpolation of the L values in the form of certain integrals with respect to Mazur-type measures.
(Conference Room San Felipe) Related references: [BS00] B ̈ocherer, S., and Schmidt, C.-G., p-adic measures attached to Siegel modular forms, Ann. Inst. Fourier 50, N. 5, 1375–1443 (2000). [Bou16] Bouganis T., p-adic Measures for Hermitian Modular Forms and the Rankin–Selberg Method. in Elliptic Curves, Modular Forms and Iwasawa Theory – Conference in honour of the 70th birthday of John Coates, pp 33–86 [CourPa] Courtieu M, Panchishkin A. A, Non-Archimedean L-Functions and Arithmetical Siegel Modular Forms, Lecture Notes in Mathematics 1471, Springer-Verlag, 2004 (2nd augmented ed.) |

16:30 - 17:00 | Break (Conference Room San Felipe) |

17:00 - 18:00 |
Siegfried Böcherer: Doubling method and exterior twists ↓ We give a survey on our work with C.Schmidt on p-adic interpolation for standard L-functions for Siegel modular forms. We emphasize that there is a strong analogy between exterior twists of Eisenstein series and appliction of certain differential operators. The case of triple product L-functions for GL(2) can be handled in a similar way.
(Conference Room San Felipe) Related references: C.G.Schmidt, S.B ̈ocherer: p-adic measures attached to Siegel modular forms. Ann.Inst.Fourier 50, 1375-1443(2000) A.Panchishkin, S.B ̈ocherer: p-adic interpolation for triple L-functions: analytic aspects. In: Automorphic Forms and L-functions II: Contemporary Math.489 (2009) |

18:00 - 20:00 | Dinner (Restaurant Hotel Hacienda Los Laureles) |

20:00 - 21:00 | Poster Session (Conference Room San Felipe) |

Wednesday, October 3 | |
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07:30 - 09:00 | Breakfast (Restaurant at your assigned hotel) |

09:00 - 10:15 |
Ellen Eischen: P-adic L-functions obtained by Eisenstein measure for unitary group I ↓ This lecture will cover the doubling method for unitary groups and the resulting in- tegral representation of the standard L-functions for cuspidal representations of unitary groups. (Conference Room San Felipe) |

10:15 - 10:45 | Coffee Break (Conference Room San Felipe) |

10:45 - 12:00 |
Zheng Liu: P-adic L-functions obtained by Eisenstein measure for unitary group II ↓ This lecture will focus on the case of the unitary group U(1) (so U(1)xU(1) inside U(1,1)) and will explain how Katz’s p-adic L-function for a CM fields is a special case of the doubling method constructions. (Conference Room San Felipe) |

12:00 - 13:30 | Lunch (Restaurant Hotel Hacienda Los Laureles) |

13:30 - 19:00 | Free Afternoon (Oaxaca) |

19:00 - 21:00 | Dinner (Restaurant Hotel Hacienda Los Laureles) |

Thursday, October 4 | |
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07:30 - 09:00 | Breakfast (Restaurant at your assigned hotel) |

09:00 - 10:15 |
Fabian Januszewski: P-adic L-function for GL(n + 1) × GL(n) III ↓ In the third talk of this lecture series I will define p-adic L-functions attached to nearly ordinary cohomology classes for GL(n+1) x GL(n) and sketch a proof of the Manin congruences and the functional equation. (Conference Room San Felipe) |

10:15 - 10:45 | Coffee Break (Conference Room San Felipe) |

10:45 - 12:00 |
Fabian Januszewski: P-adic L-function for GL(n + 1) × GL(n) IV ↓ In the last talk of this lecture series we will examine the relation between the p-adic L-functions constructed in the previous lecture and the complex analytic p-adic L-functions of Jacquet, Piatetski-Shapiro and Shalika. This will involve p-stabilization in principal series representations, a careful study of local zeta integrals and non-vanishing properties of certain Whittaker vectors. (Conference Room San Felipe) |

12:00 - 14:00 | Lunch (Restaurant Hotel Hacienda Los Laureles) |

14:00 - 15:00 |
Henri Darmon: P-adic periods arising from Garrett-Rankin triple products, their tame refinements, and Venkatesh’s derived Hecke operators ↓ An earlier paper by Harris and Venkatesh that just appeared in Exp. Math. is good background reading (but not obligatory of course; I will strive to make the lecture reasonably self-contained.)
(Conference Room San Felipe) Related references: The link is https://www.tandfonline.com/doi/abs/10.1080/10586458.2017.1409144?journalCode=uexm20 |

15:00 - 15:30 | Coffee Break (Conference Room San Felipe) |

15:30 - 16:30 |
Lennart Gehrmann: P-adic L-function of GL(2n) via method of p-adic representation. ↓ P -adic L-functions for cohomological cuspidal automorphic representations of GL(2n) were first constructed by Ash and Ginzburg in the case of trivial coefficients. We will discuss a new construction, which works for arbitrary coefficient systems. The construction relies on the representation theory of p-adic groups as well as properties of the cohomology of p-arithmetic groups. This is a generalization of Spiess’ work on the GL(2)-case.
(Conference Room San Felipe) Related references: L. Gehrmann, On Shalika models and p-adic L-functions, Israel Journal of Mathematics 226 Issue 1, (June 2018), 237–294 A. Ash and D. Ginzburg, P -adic L-functions for GL(2n), Inventiones mathematicae 116 (1994), 27–73. M. Spiess, On special zeros of p-adic L-functions of Hilbert modular forms, Inventiones mathe- maticae 196 (2014), 69–138 |

16:30 - 17:00 | Break (Conference Room San Felipe) |

17:00 - 18:00 |
Romyar Sharifi: Modular symbols in Iwasawa theory. ↓ I will give an overview of in-part conjectural relationships between modular symbols
in Eisenstein quotients of homology groups of locally symmetric spaces and cohomological oper-
ations on special units such as cyclotomic units. Some focus will be given to aspects related to
p-adic L-functions and special values. The talk will be based in part on joint work with Takako Fukaya and Kazuya Kato.
(Conference Room San Felipe) Related references: Takako Fukaya, Kazuya Kato, and Romyar Sharifi, Modular symbols in Iwasawa theory, in Iwa- sawa Theory 2012 - State of the Art and Recent Advances, Contrib. Math. Comput. Sci. 7, Springer, 2014, 177-219. Takako Fukaya and Kazuya Kato, On conjectures of Sharifi, preprint, 2012, http://math.ucla.edu/ shar- ifi/sharificonj.pdf |

18:00 - 20:00 | Dinner (Restaurant Hotel Hacienda Los Laureles) |

Friday, October 5 | |
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07:30 - 09:00 | Breakfast (Restaurant at your assigned hotel) |

09:00 - 10:15 |
Christopher Skinner: P-adic L-functions obtained by Eisenstein measure for unitary group III ↓ This lecture will review some general facts about p-adic L-functions and the Eisen- stein measure and explain the strategy for constructing one from the other. (Conference Room San Felipe) |

10:15 - 10:45 | Coffee Break (Conference Room San Felipe) |

10:45 - 12:00 |
Christopher Skinner: P-adic L-functions obtained by Eisenstein measure for unitary group IV ↓ This lecture will cover some of the details of the constructions and especially the choice of data and calculations at the p-adic places. (Conference Room San Felipe) |

12:00 - 14:00 | Lunch (Restaurant Hotel Hacienda Los Laureles) |