|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Observing primordial magnetic fields through Dark Matter | | Sabir Ramazanov
; Federico R. Urban
; Alexander Vikman
; | | Date: |
7 Oct 2020 | | Abstract: | 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 $B_0 lesssim0.01~mbox{nG}$. In our model Dark Matter is a
stable singlet scalar $chi$, which interacts with electromagnetism through the
Rayleigh operator as $chi^2 F_{mu
u} F^{mu
u}/Lambda^2$. 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 emph{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. | | Source: | arXiv, 2010.03383 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER