Project description
Bridging rational and integral points in number theory
The study of rational and integral points on algebraic varieties has long fascinated mathematicians, but a deeper understanding is needed to unify these theories. Semi-integral points, introduced by Campana and Darmon, provide a bridge, generalising these notions with an integrality condition tied to a weighted boundary divisor. Despite this progress, key questions remain about their existence and density. Supported by the Marie Skłodowska-Curie Actions programme, the GIANT project seeks to address these challenges by developing upper bounds for the density of orbifold pairs with semi-integral points and identifying obstructions to their existence. Combining techniques from analytic number theory, algebraic geometry, and arithmetic statistics, GIANT aims to tackle Diophantine problems and refine our understanding of integral solutions.
Objective
In this proposal semi-integral points refer to notions of rational points on algebraic varieties that satisfy an integrality condition with respect to a weighted boundary divisor. They were first introduced by Campana and by Darmon. Campana points have recently risen to the attention of the number theory community thanks to a Manin type conjecture in the recent work of Pieropan, Smeets, Tanimoto and Várilly-Alvarado. Semi-integral points provide both an intermediate notion and a generalisation of the notions of rational and integral points, thereby unifying the two theories. This proposal concerns the existence of semi-integral points and the density of orbifold pairs in general families having semi-integral points.
The aims of this proposal are to determine good upper bounds for the density of orbifold pairs in a general family that have semi-integral points (WP1) and to compute obstructions to the existence of semi-integral points (and hence to integral points) in key examples corresponding to long-lasting questions in number theory (WP2).
The approach will combine a variety of techniques from analytic number theory, algebraic geometry and arithmetic statistics. For (WP1), the experienced researcher and the supervisor will develop a criterion to detect local semi-integral points together with a sieve method to estimate the number of everywhere locally soluble varieties in the family. For (WP2), the research team will develop a Brauer-Manin obstruction theory for semi-integral points to compute failures of the integral Hasse principle in fundamental examples and handle classical Diophantine problems such as the existence of integral points on diagonal cubic surfaces and the non-existence of consecutive powerful numbers.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
MAIN PROGRAMME
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Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) HORIZON-MSCA-2023-PF-01
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
1113 Sofia
Bulgaria
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.