Project description
A holographic description of 4D quantum gravity in asymptotically flat spacetime
Two of the most important underlying descriptions of how the universe works are Einstein’s theory of general relativity and quantum mechanics. Unifying these two has been a challenge: gravity in the former is a continuous field and in the latter, it consists of quanta or packets of energy. The holographic principle, whose most studied example is the anti-de Sitter/conformal field theory correspondence, could reconcile these theories and is likely generally applicable to other asymptotics, including the more realistic model of 4D asymptotically flat spacetime. With the support of the Marie Skłodowska-Curie Actions programme, the UniFlatHolo project seeks to advance a holographic description of quantum gravity in asymptotically flat spacetime.
Objective
One of the most challenging open questions in theoretical physics consists in describing quantum mechanics and gravity in a unified framework. Important progress has been made towards this goal with the development of the holographic principle, whose most concrete realization is the AdS/CFT correspondence. Although AdS/CFT is the duality that has attracted the most attention, the holographic principle is believed to be much more general and to hold for other kinds of asymptotics, including for the more realistic model of four-dimensional (4d) asymptotically flat spacetime. In this regard, two proposals of flat space holography have emerged. The first consists of a 4d/3d duality, where 4d gravity is dual to a 3d Carrollian CFT living on the null boundary of the spacetime. The second is a 4d/2d duality, where 4d gravity is dual to a 2d conformal field theory, called celestial CFT, living on the celestial sphere.
The aim of this research project is to make major steps towards a holographic description of quantum gravity in asymptotically flat spacetime. To do so, we plan to provide a unified description of flat space holography by exploring the relation between the two above proposals and connecting them with the AdS/CFT correspondence through a flat limit process. Four main lines of research will be investigated: (i) the relation between 3d Carrollian CFT and 2d celestial CFT, (ii) the representations of the BMS group acting in the dual theories, (iii) the flat limit of the AdS/CFT correspondence, and (iv) the construction of explicit candidates for the dual theories.
This project involves a transfer of knowledge between the host institutions and the researcher, who will receive training in new advanced techniques in the field. This unique exchange of skills and the collaborations that will emerge in this program are expected to generate major advances in the quest for flat space holography.
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-GF - HORIZON TMA MSCA Postdoctoral Fellowships - Global 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-2022-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.
91128 PALAISEAU CEDEX
France
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.