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The fundamental constituents of black holes: structure alongside chaos

Project description

Investigating the building blocks of black holes

Black holes hold the key to unlocking one of the biggest mysteries in physics: how to unify general relativity and quantum mechanics into a single theory of quantum gravity. Their microscopic structure is at the heart of this puzzle. Are the defining features of black holes, such as the event horizon, present in each individual quantum state, or do they emerge only as a collective, thermodynamic effect? With the support of the Marie Skłodowska-Curie Actions programme, the FundOfBlack project will explore black-hole microstate behaviour, examining their composition from strings or branes and analysing their collective properties using quantum-chaos tools. Project findings will deepen our understanding of black holes and bring us closer to solving the quantum gravity puzzle.

Objective

Black holes provide an ideal testing ground for any theory of quantum gravity, a unified framework that combines General Relativity and Quantum Mechanics. String Theory, our best candidate for such a theory, has successfully passed many demanding tests in black-hole physics. Yet the exact nature of the fundamental constituents — the microstates — of black holes remains unresolved. Do individual microstates already contain an event horizon, from which nothing can escape, or does the horizon emerge only as a collective, thermodynamic feature?

This project aims to resolve these tensions by studying both the individual and collective properties of black-hole microstates. It will proceed along three complementary research routes: (i) determine whether the most generic microstates in string theory are individually smooth geometries that resemble black holes from afar but differ near the horizon; (ii) investigate under what conditions black holes can be composed of highly excited strings or brane bound states; and (iii) apply statistical and quantum-chaos diagnostics to known microstates to identify the ensemble properties they must satisfy. Together, these approaches will provide decisive insights into the microscopic structure of black holes, clarify whether horizons are fundamental or emergent, and advance our broader understanding of quantum gravity.

Fields of science (EuroSciVoc)

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Keywords

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Programme(s)

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Topic(s)

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Funding Scheme

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HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

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(opens in new window) HORIZON-MSCA-2025-PF

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Coordinator

UNIVERSITEIT VAN AMSTERDAM
Net EU contribution

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.

€ 217 076,16
Total cost

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.

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