Research Interests
 Classical and adelic modular forms
 Local and global representation theory
 Automorphic Lfunctions

Course Information for Students
TORA
TexasOklahoma Representations and Automorphic Forms is a regional conference series organized jointly by
UNT,
OSU and
OU. The TORA meetings so far:
 TORA I, September 1718, 2011, at UNT
 TORA II, April 68, 2012, at OSU
 TORA III, September 2830, 2012, at OU
 TORA IV, March 2324, 2013, at UNT
 TORA V, September 2022, 2013, at OSU
 TORA VI, March 79, 2014, at OU
 TORAS I (student TORA), March 2829, 2015, at OU
 TORA VII, April 810, 2016, at UNT
 TORA VIII, March 31  April 2, 2017, at OSU
 TORA IX, April 78, 2018, at OU
TORA is made possible by grants from the NSF. The OU meetings were supported by NSF grants
DMS1132510,
DMS1302751 and
DMS1601105.
The predecessor to the TORA conference series was
this event.
Selected Publications and Preprints
Local Newforms for GSp(4) and the Metaplectic Group
All of the following material is collaborative work with
Brooks Roberts.

New vectors for GSp(4): a conjecture and some evidence.

Surikaisekikenkyusho Kokyuroku (Research Institute for Mathematical Sciences, Kyoto University) 1338 (2003), 107121

pdf
proceedings

On modular forms for the paramodular group.

In: Automorphic Forms and Zeta Functions. Proceedings of the Conference
in Memory of Tsuneo Arakawa. World Scientific, 2006

pdf

Local Newforms for GSp(4).

Springer Lecture Note in Mathematics, vol. 1918 (2007)

pdf
errata

An alternative proof of a theorem on local newforms for GSp(4).

Proceedings of the 9th Autumn Workshop on Number Theory, Hakuba, Japan, 2006

pdf

A decomposition of the spaces $S_k(\Gamma_0(N))$ in degree 2 and the construction of hypercuspidal modular forms.

Proceedings of the 9th Autumn Workshop on Number Theory, Hakuba, Japan, 2006

pdf

Tables for Representations of GSp(4).

These are several tables containing information on the padic representation theory of the group GSp(4).
Feel free to use the tables if you need them.

pdf
latex

On the number of local newforms in a metaplectic representation.

In: Arithmetic Geometry and Automorphic Forms, International Press and Higher Education Press, 2011

pdf

Some remarks on Bessel functionals for GSp(4).

Documenta Math. 21 (2016), 467553

pdf
Bessel Models and Integral Representations for GSp(4) x GL(2)
SaitoKurokawa and Ikeda Lifting

On the spin Lfunction of Ikeda's lifts.

Comment. Math. Univ. St. Paul 52 (2003), 146

pdf

The SaitoKurokawa lifting and functoriality.

Amer. J. Math. 127 (2005), 209240

pdf

On classical SaitoKurokawa liftings.

J. Reine Angew. Math. 604 (2007), 211236

pdf

Joint with David Farmer, Ameya Pitale and Nathan Ryan:
Survey article: Characterizations of the SaitoKurokawa lifting.

Rocky Mountain J. Math. 43 (2013), 17471757

pdf

Joint with Ameya Pitale and Abhishek Saha:
Local and global Maass relations.

Math. Z., doi:10.1007/s0020901618405 (2017), 123

pdf
expanded version
Siegel Modular Forms of Degree 2

On Siegel modular forms of degree 2 with squarefree level.

Surikaisekikenkyusho Kokyuroku (Research Institute for Mathematical Sciences, Kyoto University) 1338 (2003), 155169

pdf
proceedings

Iwahorispherical representations of GSp(2) and Siegel modular forms of degree 2 with squarefree level.

J. Math. Soc. Japan 57 (2005), 259293

pdf

Joint with Ameya Pitale:
Sign changes of Hecke eigenvalues of Siegel cusp forms of degree 2.

Proc. Amer. Math. Soc. 136 (2008), 38313838

pdf

Joint with Ameya Pitale:
Ramanujantype results for Siegel cusp forms of degree 2.

J. Ramanujan Math. Soc. 24 (2009), 87111

pdf

A remark on a paper of Ibukiyama and Skoruppa.

Abh. Math. Sem. Univ. Hamburg 79 (2009), 189191

pdf

Joint with David Farmer and Nathan Ryan:
Testing the functional equation of a highdegree Euler product.

Pacific J. Math 253 (2011), 349366

pdf

Joint with Abhishek Saha:
Yoshida lifts and simultaneous nonvanishing of dihedral twists of modular Lfunctions.

J. Lond. Math. Soc. 88 (2013), 251–270

pdf

Joint with Ameya Pitale and Abhishek Saha:
Lowest weight modules of Sp_4(R) and nearly holomorphic Siegel modular forms.

Preprint, 2015

arXiv

Joint with Ameya Pitale and Abhishek Saha:
Representations of SL_2(R) and nearly holomorphic modular forms.

Surikaisekikenkyusho Kokyuroku (Research Institute for Mathematical Sciences, Kyoto University) 1973 (2015), 141153
(This note may be viewed as an introduction to the previous paper.)

arXiv
proceedings

Archimedean aspects of Siegel modular forms of degree 2.

Preprint, 2015

pdf

Packet structure and paramodular forms.

Preprint, 2016

pdf

Joint with Cris Poor and David Yuen:
Paramodular forms of level 8 and weights 10 and 12.

Preprint, 2016

pdf
Other

Joint with Mahdi Asgari:
Siegel modular forms and representations.

Manuscripta Math. 104 (2001), 173200

pdf

Some remarks on local newforms for GL(2).

J. Ramanujan Math. Soc. 17 (2002), 115147

pdf

On the archimedean Euler factors for spin Lfunctions.

Abh. Math. Sem. Univ. Hamburg 72 (2002), 119143

pdf

Joint with Mahdi Asgari:
On the adjoint Lfunction of the padic GSp(4).

J. Number Theory 128 (2008), 23402358

pdf

Joint with HiroAki Narita and Ameya Pitale:
Irreducibility criteria for local and global representations.

Proc. Amer. Math. Soc. 141 (2013), 55–63

pdf
Other Material

The SatoTate Pages. An easy introduction to the SatoTate conjecture, created in collaboration with Julian Rosen. Contains some historical remarks.

I used to be the webmaster for the math department. For any Internet related questions, I recommend this tutorial. You might also want to watch this instructional video.