Observing primordial magnetic fields through Dark Matter

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00554639" target="_blank" >RIV/68378271:_____/21:00554639 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1088/1475-7516/2021/02/011" target="_blank" >https://doi.org/10.1088/1475-7516/2021/02/011</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1475-7516/2021/02/011" target="_blank" >10.1088/1475-7516/2021/02/011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Observing primordial magnetic fields through Dark Matter

Popis výsledku v původním jazyce

Primordial magnetic fields are often thought to be the early Universe seeds that have bloomed into what we observe today as galactic and extra-galactic magnetic fields. Owing to their minuscule strength, primordial magnetic fields are very hard to detect in cosmological and astrophysical observations. We show how this changes if a part of neutral Dark Matter has a magnetic susceptibility. In this way, by studying Dark Matter one can obtain information about the properties of primordial magnetic fields, even if the latter have a comoving amplitude B-0 less than or similar to 0.01 nG. In our model Dark Matter is a stable singlet scalar x, which interacts with electromagnetism through the Rayleigh operator as chi(F mu nu F mu nu)-F-2/Lambda(2). For primordial magnetic fields present in the early Universe this operator forces the Z(2)-symmetry of the model to be spontaneously broken. Later, when the primordial magnetic field redshifts below a critical value, the symmetry is restored through an inverse phase transition. At that point the field chi begins to oscillate and acts as a magnetomorphic Dark Matter component, inheriting the properties of the primordial magnetic field space distribution. In particular, for a nearly flat spectrum of magnetic field fluctuations, the scalar chi carries a statistically anisotropic isocurvature mode. We discuss the parameter space of the model and consider the possibility that the bulk of the Dark Matter is composed of the same particles chi produced via the freeze-in mechanism.

Název v anglickém jazyce

Observing primordial magnetic fields through Dark Matter

Popis výsledku anglicky

Primordial magnetic fields are often thought to be the early Universe seeds that have bloomed into what we observe today as galactic and extra-galactic magnetic fields. Owing to their minuscule strength, primordial magnetic fields are very hard to detect in cosmological and astrophysical observations. We show how this changes if a part of neutral Dark Matter has a magnetic susceptibility. In this way, by studying Dark Matter one can obtain information about the properties of primordial magnetic fields, even if the latter have a comoving amplitude B-0 less than or similar to 0.01 nG. In our model Dark Matter is a stable singlet scalar x, which interacts with electromagnetism through the Rayleigh operator as chi(F mu nu F mu nu)-F-2/Lambda(2). For primordial magnetic fields present in the early Universe this operator forces the Z(2)-symmetry of the model to be spontaneously broken. Later, when the primordial magnetic field redshifts below a critical value, the symmetry is restored through an inverse phase transition. At that point the field chi begins to oscillate and acts as a magnetomorphic Dark Matter component, inheriting the properties of the primordial magnetic field space distribution. In particular, for a nearly flat spectrum of magnetic field fluctuations, the scalar chi carries a statistically anisotropic isocurvature mode. We discuss the parameter space of the model and consider the possibility that the bulk of the Dark Matter is composed of the same particles chi produced via the freeze-in mechanism.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Cosmology and Astroparticle Physics

ISSN

1475-7516

e-ISSN

1475-7516

Svazek periodika

2021

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

26

Strana od-do

011

Kód UT WoS článku

000620675500011

EID výsledku v databázi Scopus

2-s2.0-85101546550