Special periods and some non-tempered cases of the Gan-Gross-Prasad conjecture
Pith reviewed 2026-05-08 17:50 UTC · model grok-4.3
The pith
Relations between special periods and L-values prove three non-tempered higher-corank cases of the Gan-Gross-Prasad conjecture.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The central discovery is that the interaction of special periods with the tower property for theta lift genericity, studied via Rankin-Selberg integrals, establishes the required non-vanishing and period relations to confirm the Gan-Gross-Prasad conjecture for three specific higher-corank families in the non-tempered case.
What carries the argument
The interaction between special periods and the tower property for genericity of global theta lifts, together with Rankin-Selberg integrals linking periods to L-function properties.
If this is right
- The Gan-Gross-Prasad conjecture holds for the three higher-corank non-tempered families identified.
- Special periods can be used to detect non-vanishing of certain L-values in these settings.
- The tower property extends to control the genericity of theta lifts for non-tempered representations.
- Analytic properties of L-functions follow from the behavior of period integrals on classical groups.
Where Pith is reading between the lines
- This method could extend to proving additional cases of the conjecture by identifying more families where the criteria apply.
- Similar period-L-value relations might inform proofs for other period conjectures involving automorphic forms.
- Computational checks for low-dimensional cases in these families could provide further evidence or counterexamples.
Load-bearing premise
The non-vanishing criteria for global theta lifts based on L-values hold without restrictions that would exclude the three targeted higher-corank families.
What would settle it
An explicit automorphic representation belonging to one of the three families where a special period vanishes despite a non-vanishing central L-value, or where the GGP period fails to match the L-value prediction, would disprove the relations used.
read the original abstract
In this paper, we establish a relationship between special periods and special L-values of automorphic representations of classical groups, and prove the non-tempered global Gan--Gross--Prasad conjecture in several cases. Our approach consists of two main steps. First, inspired by Rallis' tower property, we study the interaction between special periods and the tower property for the genericity of global theta lifts. Second, we investigate the relationship between the analytic properties of L-functions and special periods via the Rankin--Selberg integral method. Combining these results with non-vanishing criteria for global theta lifts in terms of various L-values, we prove three explicit higher-corank families of non-tempered cases of the global Gan--Gross--Prasad conjecture.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript establishes a relationship between special periods and special L-values of automorphic representations of classical groups. It studies the interaction between special periods and the tower property for the genericity of global theta lifts, inspired by Rallis' tower property. It also investigates the relationship between the analytic properties of L-functions and special periods using the Rankin-Selberg integral method. By combining these with non-vanishing criteria for global theta lifts in terms of L-values, the paper proves three explicit higher-corank families of non-tempered cases of the global Gan-Gross-Prasad conjecture.
Significance. If the results hold, this paper makes a significant contribution to the Gan-Gross-Prasad conjecture by providing explicit examples in higher-corank non-tempered cases, which are challenging. The approach builds on established tools such as the Rallis tower property and Rankin-Selberg integrals, and the combination with non-vanishing criteria offers a systematic way to handle these cases. The explicit families identified could serve as test cases for further generalizations.
Simulated Author's Rebuttal
We thank the referee for the careful summary of our manuscript, the positive assessment of its significance, and the recommendation for minor revision. No specific major comments were raised in the report.
Circularity Check
No significant circularity identified
full rationale
The derivation proceeds by relating special periods to L-values via the Rallis tower property for theta-lift genericity and Rankin-Selberg integrals, then invoking independent non-vanishing criteria to obtain explicit families for the non-tempered GGP conjecture. No step reduces by construction to a fitted input renamed as prediction, a self-definitional equivalence, or a load-bearing self-citation chain whose validity depends on the target result. The cited tools are standard external results in the literature whose independence is not contradicted by the paper's own equations or assumptions.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption Standard properties of L-functions attached to automorphic representations of classical groups and non-vanishing criteria for theta lifts
- domain assumption Rallis tower property for genericity of global theta lifts
Reference graph
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