The Selberg Conjecture
Research Index

A curated, non-commercial reference index of freely available mathematics research papers on the Selberg Conjecture — linking directly to arXiv, ResearchGate, and Google Scholar.

λ₁ ≥ 1/4  ·  Γ\ℍ  ·  Δ eigenvalues

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What is the Selberg Conjecture?

Background context and thematic guide to the research areas covered in this index.

Mathematical Background

The Selberg Conjecture (also known as Selberg's Eigenvalue Conjecture) was proposed by Atle Selberg in 1965. It asserts that for any congruence subgroup Γ of SL(2,ℤ), the smallest non-zero eigenvalue λ₁ of the Laplace–Beltrami operator on the associated hyperbolic surface satisfies λ₁ ≥ 1/4.

This conjecture is deeply connected to the Ramanujan Conjecture for GL(2) automorphic forms, and more broadly to the Generalized Ramanujan Conjecture (GRC) for higher-rank groups. It sits at the intersection of spectral theory, automorphic forms, and analytic number theory.

The best known result toward the conjecture is due to Kim and Sarnak (2003), who established λ₁ ≥ 975/4096 — derived from Kim's proof of the functoriality of the symmetric fourth power lift of automorphic forms on GL(2).

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Spectral Theory

Eigenvalues of the Laplacian on hyperbolic surfaces and congruence subgroups.

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Automorphic Forms

Maass forms, cusp forms, and their Fourier coefficients on GL(n).

Ramanujan Conjecture

Connections between Selberg's eigenvalue bound and the Ramanujan–Petersson conjecture.

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Functoriality

Langlands functoriality, symmetric power lifts, and their role in bounding eigenvalues.

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Analytic Number Theory

Sieve methods, L-functions, and applications of spectral gaps to prime distribution.

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Historical Foundations

Selberg's original trace formula, zeta functions, and early progress on the conjecture.

Curated Paper Index

References sourced from the Wikipedia article on the Selberg Conjecture. No papers are hosted here. Search arXiv, ResearchGate, or Google Scholar directly using the titles and authors below.

Journal1965

On the Estimation of Fourier Coefficients of Modular Forms

Atle Selberg
Journal1984

Spectral Methods in Automorphic Forms and the Selberg Conjecture

Henryk Iwaniec
Journal1991

Bounds for Automorphic L-Functions

W. Luo, Z. Rudnick, P. Sarnak
Journal2000

On the Ramanujan Conjecture and Finiteness of Poles for Certain L-Functions

Henry H. Kim, Freydoon Shahidi
Journal2002

Functoriality for the Exterior Square of GL₄ and the Symmetric Fourth of GL₂

Henry H. Kim
Journal2003

Appendix: Selberg's Eigenvalue Conjecture

Peter Sarnak
Journal2003

Symmetric Power L-Functions and Applications

Henry H. Kim, Freydoon Shahidi
Book / Monograph2004

Spectral Methods in Automorphic Forms

Henryk Iwaniec
Journal2005

Notes on the Generalized Ramanujan Conjectures

Peter Sarnak
arXiv2021

Density Theorems for GL(n) and the Selberg Conjecture

Recent preprint literature

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