Soumya Das

Associate Professor, Department of Mathematics, Indian Institute of Science, Bangalore - 560012, India.

email: firstname.u2k@gmail.com,

firstname@iisc.ac.in

Research interests: Analytic aspects of Automorphic forms, analytic and algebraic number theory.

~If someone does science in a forest, but doesn't make a sound, did science actually happen?

- Michael Short.

Mentoring

Ph.D. :

1) Pramath Anamby (2014 --) (IISc)

2) Ritwik Pal (2014 --) (IISc)

3) K. Hariram (2016 --) (IISc)

Post-Docs :

Sushma Palimar (DST Women Scientist, 2017--),

Abhash Kr. Jha (SERB-NPDF, 2017--),

Sneh Bala Sinha (NBHM PostDoc, 2018--).

Msc : Vignesh AH (2015), A. Dasgupta (2018)

UG : Final Year projects: Chirag (2014), Debatosh Das (2016)

Reading Projects:

Summer students

Teaching

Jan 2019: MA 213, Algebra II: Grading policy - There would be no written assignments to be turned in. However, there would be periodical quizzes (say of duration 30-45 mins conducted by the T.A.) followed by discussion of these and other practice problems, which would be put up on this webpage periodically.

Approximately the weightage would be: 25%, 25%, 50% for Quizzes, Mid-term exam, Final-exam respectively. The TA for this course is G. V. K. Teja (with assistance from M Hassain).

* The mid semestral examination has been scheduled during 18-23 Feb. on 23 Feb. from 10AM-1 PM in LH-1. The syllabus would be whatever was covered in class until 14 February.

**Practice problems should be considered as supplements to the class, and are examinable, unless mentioned otherwise. You can ask about any of them to either the T.A. or the instructor.

***Final exam would be held on ?? April, from ??AM to ?? PM. Venue would be .... Please write short answers. Short and correct answers would be given high value. In particular there is no point in deriving or proving things which have already been proved in class. You may just state them.

(a) Practice problems: P1, P2, P3, P4, A1 (to be submitted by few of you)

(b) Quizzes: Q1, Q2, Q3, Q3', Q4, Q5, Q6, Q7

(c) Solutions: S1

(c) Mid-term: M1, F1

Preprints

(this version proves Andrianov's conjecture on the functional equation of the spinor-function for holomorphic Siegel cusp forms of degree 3, when combined with A. Pollacks's work.)


Publications

Hecke-Siegel type threshold for square-free Fourier coefficients: an improvement RIMS Kokyuroku Kyoto Univ., proceedings for the conference “Analytic and Arithmetic Theory of Automorphic Forms”, January 2018. (With P. Anamby)

MR4034598 Das, Soumya; Jha, Abhash Kumar Analytic properties of twisted real-analytic Hermitian Klingen type Eisenstein series and applications. Abh. Math. Semin. Univ. Hambg. 89 (2019), no. 2, 105–116. 11F55 (11F66)

MR3974676 Das, Soumya; Pal, Ritwik The first negative eigenvalue of Yoshida lifts. Res. Number Theory 5 (2019), no. 3, Paper No. 20, 9 pp. (Reviewer: Hideshi Takayanagi) 11F46 (11F66)

MR3908796 Anamby, Pramath; Das, Soumya Distinguishing Hermitian cusp forms of degree 2 by a certain subset of all Fourier coefficients. Publ. Mat. 63 (2019), no. 1, 307–341. (Reviewer: Brundaban Sahu) 11F30 (11F50 11F55)

MR3859224 Das, Soumya; Khan, Rizwanur The third moment of symmetric square L-functions. Q. J. Math. 69 (2018), no. 3, 1063–1087. (Reviewer: Valentin Blomer) 11M06

MR3846155 Böcherer, Siegfried; Das, Soumya Petersson norms of not necessarily cuspidal Jacobi modular forms and applications. Adv. Math. 336 (2018), 335–376. (Reviewer: G. K. Sankaran) 11F50 (11F46)

MR3836146 Böcherer, Siegfried; Das, Soumya Cuspidality and the growth of Fourier coefficients of modular forms. J. Reine Angew. Math. 741 (2018), 161–178. (Reviewer: Hideshi Takayanagi) 11F30 (11F46)

MR3825472 Anamby, Pramath; Das, Soumya Bounds for the Petersson norms of the pullbacks of Saito-Kurokawa lifts. J. Number Theory 191 (2018), 289–304. (Reviewer: Karam Deo Shankhadhar) 11F11 (11F46 11F66)

MR3798786 Das, Soumya; Kohnen, Winfried On sign changes of eigenvalues of Siegel cusp forms of genus 2 in prime powers. Acta Arith. 183 (2018), no. 2, 167–172. (Reviewer: Tomoyoshi Ibukiyama) 11F46 (11F41)

MR3931445 Anamby, Pramath; Das, Soumya Sturm-like bound for square-free Fourier coefficients. L-functions and automorphic forms, 1–7, Contrib. Math. Comput. Sci., 10, Springer, Cham, 2017. 11F30

MR3657159 Das, Soumya; Pal, Ritwik Jacobi forms and differential operators: odd weights. J. Number Theory 179 (2017), 113–125. (Reviewer: Karam Deo Shankhadhar) 11F50 (11F11 11F25)

MR3489079 Böcherer, Siegfried; Das, Soumya Cuspidality and the growth of Fourier coefficients: small weights. Math. Z. 283 (2016), no. 1-2, 539–553. (Reviewer: Martin Raum) 11F30 (11F46)

MR3477807 Das, Soumya Cuspidality and the growth of Fourier coefficients of modular forms: a survey. Indian J. Pure Appl. Math. 47 (2016), no. 1, 9–22. (Reviewer: Kalyan Chakraborty) 11F30

MR3477047 Das, Soumya; Ganguly, Satadal A note on small gaps between nonzero Fourier coefficients of cusp forms. Proc. Amer. Math. Soc. 144 (2016), no. 6, 2301–2305. (Reviewer: Cherng-tiao Perng) 11F30 (11F11 11G05)

MR3385236 Das, Soumya; Khan, Rizwanur Simultaneous nonvanishing of Dirichlet L-functions and twists of Hecke-Maass L-functions. J. Ramanujan Math. Soc. 30 (2015), no. 3, 237–250. (Reviewer: Sanoli Gun) 11F11 (11F66)

MR3366849 Das, Soumya; Kohnen, Winfried Nonvanishing of Koecher-Maass series attached to Siegel cusp forms. Adv. Math. 281 (2015), 624–669. (Reviewer: Valentin Blomer) 11F30 (11F46)

MR3365786 Das, Soumya; Sengupta, Jyoti L∞ norms of holomorphic modular forms in the case of compact quotient. Forum Math. 27 (2015), no. 4, 1987–2001. (Reviewer: Guangshi Lü) 11F11 (11F12) (update: use this version PDF)

MR3327845 Das, Soumya; Meher, Jaban On quasimodular eigenforms. Int. J. Number Theory 11 (2015), no. 3, 835–842. (Reviewer: Dominic A. Lanphier) 11F30 (11F11)

MR3296015 Das, Soumya; Ramakrishnan, B. Jacobi forms and differential operators. J. Number Theory 149 (2015), 351–367. (Reviewer: John Francis Robert Duncan) 11F50 (11F11 11F25)

MR3280046 Böcherer, Siegfried; Das, Soumya Linear independence of Poincaré series of exponential type via non-analytic methods. Trans. Amer. Math. Soc. 367 (2015), no. 2, 1329–1345. (Reviewer: Sheng-Chi Liu) 11F30 (11F46)

MR3251716 Das, Soumya; Ganguly, Satadal Gaps between nonzero Fourier coefficients of cusp forms. Proc. Amer. Math. Soc. 142 (2014), no. 11, 3747–3755. (Reviewer: Scott Ahlgren) 11F30 (11F11 11N25)

MR3201897 Böcherer, Siegfried; Das, Soumya Characterization of Siegel cusp forms by the growth of their Fourier coefficients. Math. Ann. 359 (2014), no. 1-2, 169–188. (Reviewer: Rainer Schulze-Pillot) 11F30 (11F46)

MR3182539 Das, Soumya; Kohnen, Winfried; Sengupta, Jyoti On a convolution series attached to a Siegel Hecke cusp form of degree 2. Ramanujan J. 33 (2014), no. 3, 367–378. (Reviewer: Suzanne Caulk) 11F46 (11F66)

MR3148511 Das, Soumya; Sengupta, Jyoti An Omega-result for Saito-Kurokawa lifts. Proc. Amer. Math. Soc. 142 (2014), no. 3, 761–764. (Reviewer: B. Ramakrishnan) 11F46 (11F30)

MR3221309 Das, Soumya; Kohnen, Winfried Some remarks on the Resnikoff-Saldaña conjecture. The legacy of Srinivasa Ramanujan, 153–161, Ramanujan Math. Soc. Lect. Notes Ser., 20, Ramanujan Math. Soc., Mysore, 2013. (Reviewer: Jae-Hyun Yang) 11F30 (11F46)

MR3065087 Böcherer, Siegfried; Das, Soumya On holomorphic differential operators equivariant for the inclusion of Sp(n,R) in U(n,n). Int. Math. Res. Not. IMRN 2013, no. 11, 2534–2567. (Reviewer: Rolf Berndt) 32M15 (11F03 32W50)

MR2997487 Das, Soumya On the natural densities of eigenvalues of a Siegel cusp form of degree 2. Int. J. Number Theory 9 (2013), no. 1, 9–15. (Reviewer: Suzanne Caulk) 11F46 (11F30)

MR2997486 Das, Soumya; Ganguly, Satadal Nonvanishing of Poincaré series on average. Int. J. Number Theory 9 (2013), no. 1, 1–8. (Reviewer: Barış Kendirli) 11F11 (11F30)

MR2997572 Das, Soumya; Kohnen, Winfried; Sengupta, Jyoti Nonvanishing of Siegel-Poincaré series II. Acta Arith. 156 (2012), no. 1, 75–81. (Reviewer: Ellen E. Eischen) 11F46 (11F30)

MR2995143 Das, Soumya; Sengupta, Jyoti Nonvanishing of Siegel Poincaré series. Math. Z. 272 (2012), no. 3-4, 869–883. (Reviewer: Ellen E. Eischen) 11F46 (11L05)

MR2975157 Das, Soumya; Ganguly, Satadal Linear relations among Poincaré series. Bull. Lond. Math. Soc. 44 (2012), no. 5, 988–1000. (Reviewer: SoYoung Choi) 11F11 (11F30)

MR2769134 Das, Soumya Nonvanishing of Jacobi Poincaré series. J. Aust. Math. Soc. 89 (2010), no. 2, 165–179. (Reviewer: Olav K. Richter) 11F50 (11F30)

MR2738862 Das, Soumya Some aspects of Hermitian Jacobi forms. Arch. Math. (Basel) 95 (2010), no. 5, 423–437. (Reviewer: Anton Deitmar) 11F50 (11F60)

MR2723724 Das, Soumya Note on Hermitian Jacobi forms. Tsukuba J. Math. 34 (2010), no. 1, 59–78. (Reviewer: B. Ramakrishnan) 11F50 (11F55)