Impact of primordial magnetic fields on matter power spectrum

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• Pranjal Ralegankar (SISSA)
• Monday 24 June 2024, 12:00-13:00
• Ryle seminar room + online.

If you have a question about this talk, please contact Sandro Tacchella.

Primordial magnetic fields (PMFs) offer a simple explanation for the origin of galactic magnetic fields as well as of the purportedly detected magnetic fields in cosmic voids. In the talk, I discuss how PMFs’ influence on structure formation can offer a complementary method to test for their existence. Specifically, I discuss how PMFs enhance the matter power spectrum on small scales (sub-Mpc). On scales relevant to galaxies and black holes, I show that PMFs can significantly enhance the baryon fraction in halos as well as the abundance of halos. Next, I show that on scales below the baryon Jeans scales, PMFs can enhance dark matter power spectrum purely by gravitational influence. I conclude by arguing how search for dark matter minihalos can potentially provide the most sensitive probe for PMFs.

This talk is part of the Galaxies Discussion Group series.

This talk is included in these lists:

• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Galaxies Discussion Group
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Ryle seminar room + online

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