(ORDO NEWS) — Italian astrophysicists have studied ancient galaxies 13 billion years old discovered by the James Webb Space Telescope (JWST).
The results of the study allow us to refine the properties of dark matter, which played a key role in the formation of large-scale structures in the early Universe.
The generally accepted model for the formation of structures is based on cold dark matter – non-relativistic matter, which is only capable of gravitational interaction.
In this scenario, the particles that make up the cold dark matter move slowly and are characterized by a short free-mixing length.
However, there are alternative scenarios that rely on the hypothesis that dark matter is created by hot particles with a low thermal velocity.
The degree of cosmological star formation, ultraviolet luminosity, and molecular abundance depend on which model of dark matter is adopted.
The researchers developed a complex numerical model of the influence of dark matter on the formation of early galaxies and compared it with the JWST observations.
It turned out that dark matter should consist of either cold or slightly warm particles with a mass of more than two electron volts.
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