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Probe of the first microseconds of the Universe with cosmological magnetic fields

Objective

Big Bang Nucleosynthesis, Cosmic Microwave Background and Large Scale Structure constitute the three
solid observational grounds of modern Cosmology. However, we currently lack a probe of the state of
the primordial plasma during the first microseconds of the Universe’s history. Surmounting this frontier
in our knowledge of the Universe is particularly compelling, since during this period, crucial beyond-
Standard-Model phenomena should have happened: the thermalisation of the Universe, the spontaneous
breaking of fundamental symmetries, the generation of the matter-antimatter asymmetry, the production of
dark matter. The goal of COSMOMAG is to establish, for the first time, a probe of the first microseconds of
the Universe, using cosmological magnetic fields. We will achieve this by combining information from
multiple observational channels, which will allow us to trace the imprint of magnetic fields at different
cosmological epochs. We will ascertain the presence of magnetic fields in the Large-Scale Structure of the
present-day Universe, using the techniques of multi-messenger (gamma-ray, radio and ultra-high-energy
cosmic ray) astronomy, leveraging the sensitivities of major observatories in each messenger channel.
In parallel, we will constrain the presence of the magnetic field at earlier epochs, through its effect on
the Cosmic Microwave and Stochastic Gravitational Wave Backgrounds. We will combine all available
multi-messenger information from different electromagnetic and gravitational wave channels with the
results of innovative numerical simulations, tracing the evolution of cosmic magnetism in time, from the
moment of its generation in the early Universe, until today. This will allow us to build a comprehensive
observational and theoretical approach linking the present-day magnetic field to the physics responsible
for its generation in the first instants of the Universe.

Fields of science (EuroSciVoc)

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Programme(s)

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Topic(s)

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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.

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.

(opens in new window) ERC-2025-SyG

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Host institution

UNIVERSITE PARIS CITE
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.

€ 2 769 675,00
Address
85 BD SAINT GERMAIN
75006 PARIS
France

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Region
Ile-de-France Ile-de-France Paris
Activity type
Higher or Secondary Education Establishments
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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.

€ 2 769 675,00

Beneficiaries (5)

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