Progress on Cosmological Magnetic Fields

Vachaspati, Tanmay

doi:10.48550/arxiv.2010.10525

Cited by 12 publications

(18 citation statements)

References 161 publications

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“…Charged particles like cosmic rays and the charged leptons produced in electromagnetic cascades can be deflected by IGMFs and GMFs. The former comprises fields in clusters (∼ 1 µG), filaments (∼ 1-100 nG), and cosmic voids, whose strength is mostly unknown, ranging from O(10 −6 nG) to O(1 nG) [941,942]. The coherence length of these fields, i.e.…”

Section: Effects Of Magnetic Fieldsmentioning

confidence: 99%

Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review

Addazi,

Alvarez-Muniz,

Batista

et al. 2021

Preprint

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The exploration of the universe has recently entered a new era thanks to the multi-messenger paradigm, characterized by a continuous increase in the quantity and quality of experimental data that is obtained by the detection of the various cosmic messengers (photons, neutrinos, cosmic rays and gravitational waves) from numerous origins. They give us information about their sources in the universe and the properties of the intergalactic medium. Moreover, multi-messenger astronomy opens up the possibility to search for phenomenological signatures of quantum gravity. On the one hand, the most energetic events allow us to test our physical theories at energy regimes which are not directly accessible in accelerators; on the other hand, tiny effects in the propagation of very high energy particles could be amplified by cosmological distances. After decades of merely theoretical investigations, the possibility of obtaining phenomenological indications of Planck-scale effects is a revolutionary step in the quest for a quantum theory of gravity, but it requires cooperation between different communities of physicists (both theoretical and experimental). This review, prepared within the COST Action CA18108 "Quantum gravity phenomenology in the multi-messenger approach", is aimed at promoting this cooperation by giving a state-of-the art account of the interdisciplinary expertise that is needed in the effective search of quantum gravity footprints in the production, propagation and detection of cosmic messengers.

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Section: Effects Of Magnetic Fieldsmentioning

confidence: 99%

Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review

Addazi,

Alvarez-Muniz,

Batista

et al. 2021

Preprint

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“…Radio galaxies can also play a role in the genesis of magnetic fields in galaxy clusters (Kronberg et al 1999;Furlanetto & Loeb 2001;Xu et al 2009), as they can seed primordial magnetic fields (e.g. Vachaspati 2020, for a recent review). Outside of the virial regions of clusters, the impact of galaxies on extragalactic magnetic fields is expected to be detectable with the next generation of deep radio surveys, both in total intensity and Article number, page 1 of 21 arXiv:2102.04193v1 [astro-ph.HE] 8 Feb 2021 polarisation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Simulating the transport of relativistic electrons and magnetic fields injected by radio galaxies in the intracluster medium

Vazza

Wittor

Brunetti

et al. 2021

A&A

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Radio galaxies play an important role in the seeding of cosmic rays and magnetic fields in galaxy clusters. Here, we simulate the evolution of relativistic electrons injected into the intracluster medium by radio galaxies. Using passive tracer particles added to magnetohydrodynamical adaptive-mesh simulations, we calculated the evolution of the spectrum of relativistic electrons, taking into account energy losses and re-acceleration mechanisms associated with the dynamics of the intracluster medium. Re-acceleration can occur at shocks via diffusive shock acceleration, and in turbulent flows via second-order Fermi re-acceleration. This study confirms that relativistic electrons from radio galaxies can efficiently fill the intracluster medium over scales of several hundreds of Myr and that they create a stable reservoir of fossil electrons that remains available for further re-acceleration by shock waves and turbulent gas motions. Our results also show that late evolution of radio lobes and remnant radio galaxies is significantly affected by the dynamics of the surrounding intracluster medium. Here, the diffusive re-acceleration couples the evolution of relativistic particles to the gas perturbations. In the near future, deep radio observations, especially at low frequencies, will be able to probe such mechanisms in galaxy clusters.

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“…As we can see from Fig. 1, allowed values for the magnetic fields at the moment of generation are not constrained to microGauss field strength, as it was claimed previously based on BBN bounds without accounting for decaying turbulence [40]. In fact, if previously we were considering the Alfvén speed (or plasma motion characteristic velocity) around 0.2-0.3 (in units of the speed of light), the new limits possibly imply v A (v T ) → 1 [44].…”

mentioning

confidence: 54%

“…for a review and references therein. Additionally there are several manifestations of parity symmetry violations in astrophysical objects, including one-sided, oriented radio jets that might be an indication of helical (chiral) magnetic fields presence in the early universe[40].…”

mentioning

confidence: 99%

Big Bang Nucleosynthesis Limits and Relic Gravitational Waves Detection Prospects

Kahniashvili,

Clarke,

Stepp

et al. 2021

Preprint

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We revisit the big bang nucleosynthesis (BBN) limits on primordial magnetic fields and/or turbulent motions accounting for the decaying nature of turbulent sources between the time of generation and BBN. This leads to larger estimates for the gravitational wave (GW) signal than previously expected. We address the detection prospects through space-based interferometers (for GWs generated around the electroweak energy scale) as well as pulsar timing arrays and astrometric missions (for GWs generated around the quantum chromodynamics energy scale).

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Progress on Cosmological Magnetic Fields

Cited by 12 publications

References 161 publications

Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review

Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review

Simulating the transport of relativistic electrons and magnetic fields injected by radio galaxies in the intracluster medium

Big Bang Nucleosynthesis Limits and Relic Gravitational Waves Detection Prospects

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