Project description
Profiling the source of the Hubble tension
The standard model is the best description to date of the particle universe, despite known limitations. Recently, observations from large sky surveys and distance measurements with a variety of advanced cosmological probes have pointed to ‘tensions’ – differences in certain measurements predicted to be equal. The most important is the expansion rate of the universe, quantified by the Hubble parameter, H0. Early-universe standard model predictions are different from ‘late-universe’ direct measurements. The ERC-funded RedH0T project aims to determine whether the inconsistency arises from observational issues or limitations in the current model by systematically combining data from all available cosmological probes. Inconsistencies in the model would reshape understanding of the nature of the universe.
Objective
Despite the spectacular success of the standard cosmological model over the past two decades, recent observations from large sky surveys and distance measurements with a broad range of cosmological probes suggest cracks to the accepted paradigm: differences now appear in measurements of quantities the current cosmological model predicts as equal. These are called “tensions”. The most important tension concerns the Hubble parameter, H0, which quantifies the expansion rate of the Universe now, some 13 billion years after Big-Bang. The Hubble tension is the discrepancy between the value of H0, when inferred as a global parameter of the standard cosmological model relying heavily on early-Universe physics, and when measured directly in the late-time Universe from the redshift-to-distance relation. While the tension is well-established, there is no consensus on its actual significance nor on what it means for the standard cosmological model, even broadly speaking. Comparing the values of H0 from the early and the late Universe is like “Threading a needle from the other side of the Universe”; in a very unique way it enables vital end-to-end tests of cosmology to be performed.
RedH0T proposes to determine, in a self-consistent manner and using the synergies between all available cosmological probes, whether the tension arises from observational issues or from limitations in the current cosmological model. In the former case, we will impose strong limits of possible deviations from the standard cosmological. But if the latter is confirmed, it will represent one of the most significant discoveries of the 21st century, with profound implications not only for cosmology, but also for physics in general. The team gathers all required expertise to tackle the problem from all view-angles, addressing in a self-critical and constructive way all theoretical and observational aspects simultaneously.
Fields of science (EuroSciVoc)
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.
This project's classification has been human-validated.
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.
This project's classification has been human-validated.
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.1.1 - European Research Council (ERC)
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-ERC-SYG - HORIZON ERC Synergy Grants
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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) ERC-2025-SyG
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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.
08007 Barcelona
Spain
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.