scholarly journals Magnetic fields from cosmological bulk flows

2020 ◽  
Vol 497 (3) ◽  
pp. 3537-3541
Author(s):  
J A R Cembranos ◽  
A L Maroto ◽  
H Villarrubia-Rojo
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Galaxy Formation ◽  
Relative Velocity ◽  
Background Level ◽  
Bulk Flow ◽  
Microwave Background ◽  
Boltzmann Equations ◽  
First Order ◽  
Dynamo Mechanism

ABSTRACT We explore the possibility that matter bulk flows could generate the required vorticity in the electron–proton–photon plasma to source cosmic magnetic fields through the Harrison mechanism. We analyse the coupled set of perturbed Maxwell and Boltzmann equations for a plasma in which the matter and radiation components exhibit relative bulk motions at the background level. These background bulk motions induce a relative velocity between the matter and cosmic microwave background rest frames at the present time, i.e. a bulk flow, with an amplitude β. We find that, to first order in cosmological perturbations, bulk flows with velocities compatible with current Planck limits (β < 8.5 × 10−4 at $95{{\ \rm per\ cent}}$ CL) could generate magnetic fields with an amplitude 10−21 G on 10 kpc comoving scales at the time of completed galaxy formation that could be sufficient to seed a galactic dynamo mechanism.

scholarly journals Probing Intracluster Magnetic Fields with Cosmic Microwave Background Polarization

2003 ◽  
Vol 584 (2) ◽  
pp. 599-607 ◽  
Author(s):  
Hiroshi Ohno ◽  
Masahiro Takada ◽  
Klaus Dolag ◽  
Matthias Bartelmann ◽  
Naoshi Sugiyama
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Cosmic Microwave Background Polarization

scholarly journals Cosmic Microwave Background Fluctuation Searches On 5° to 10° Scales

1990 ◽  
Vol 139 ◽  
pp. 398-399
Author(s):  
R. D. Davies ◽  
R. A. Watson ◽  
R. Rebolo ◽  
J. Beckman ◽  
A. N. Lasenby
Keyword(s):  
Cosmic Microwave Background ◽  
Early Universe ◽  
Galaxy Formation ◽  
Atmospheric Effects ◽  
Microwave Background ◽  
Fundamental Information ◽  
Background Fluctuation ◽  
Beam Technique

Deep observations of the cosmic microwave background (CMB) have been made at 10 GHz with beamwidths of 5° and 8° using a triple-beam technique, which greatly reduces atmospheric effects. Significant signals are detected with an rms of ΔT/T ~ 4×10−5. These signals could be intrinsic to the CMB and are providing fundamental information about galaxy formation in the early universe. A component of this 10 GHz emission may be coming from galactic synchrotron features. This galactic contribution will be elucidated in forthcoming 15 and 30 GHz observations.

scholarly journals Primordial magnetism in CMB B modes

2013 ◽  
Vol 91 (6) ◽  
pp. 451-454 ◽  
Author(s):  
Levon Pogosian ◽  
Tanmay Vachaspati ◽  
Amit Yadav
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Frequency Dependence ◽  
Faraday Rotation ◽  
Characteristic Frequency ◽  
Mode Coupling ◽  
Microwave Background ◽  
Small Scales ◽  
Cmb Polarization ◽  
Primordial Magnetic Fields

Cosmic microwave background (CMB) polarization B modes induced by Faraday rotation (FR) can provide a distinctive signature of primordial magnetic fields because of their characteristic frequency dependence and because they are only weakly damped on small scales. FR also leads to mode-coupling correlations between the E- and B-type polarizations and between the temperature and the B mode. These additional correlations can further help distinguish magnetic fields from other sources of B modes. We review the FR-induced CMB signatures and present the constraints on primordial magnetism that can be expected from upcoming CMB experiments. Our results suggest that FR of CMB will be a promising probe of primordial magnetic fields.

scholarly journals The Features of the Reference Frame Concomitant to the Cosmic Microwave Background

2021 ◽  
Vol 3 (6) ◽  
pp. 1-6
Author(s):  
V. M. Svishch
Keyword(s):  
Cosmic Microwave Background ◽  
Reference Frame ◽  
Relative Velocity ◽  
Reference Frames ◽  
Background Radiation ◽  
Microwave Background ◽  
Microwave Background Radiation ◽  
Stellar Aberration ◽  
The Universe ◽  
Synchronous Time

The features of reference frame, concomitant to the cosmic microwave background, immobile relatively cosmic microwave background, are considered. It is shown that the features of reference frame, concomitant to the cosmic microwave background (CMB), are determined by its properties. Any other object in the Universe and reference frame concomitant to it, is immersed in the CMB and moves relative to the reference frame concomitant to microwave background radiation. The zero pecular velocity of the reference frame concomitant to the microwave background radiation is analogous to the zero temperature on the Kelvin scale. Time in it is most rapid in relation to the time in any other reference frame, observable and measurable in any of them. The features of time, pecular speed, relative speed of two inertial RF, stellar aberration, and Doppler effect in the reference frame concomitant to the microwave background radiation are considered. According to the determined relative velocity of the two reference systems and the peculiar velocity of the reference system with the observer, the components of their relative velocity are determined. Determining the components of the relative velocity of the reference frames with determining the synchronous time for all points at any time in the reference frame concomitant to microwave background radiation, allows us to investigate the possibility of determining the speed of light "one way" and using it to navigate vehicles in distant space. Stability of angular location of heterogeneities of CMB in reference frame concomitant to CMB, allows us to use these heterogeneities for the increase of exactness of astronomic reference frames HCRF and ICRF.

scholarly journals Clustering of hotspots in the cosmic microwave background

2019 ◽  
Vol 206 ◽  
pp. 09017
Author(s):  
En Zuo Joel Low ◽  
Abel Yang
Keyword(s):  
Cosmic Microwave Background ◽  
Galaxy Formation ◽  
Equilibrium Distribution ◽  
Negative Binomial ◽  
Clustering Algorithms ◽  
Quasi Equilibrium ◽  
Microwave Background ◽  
Temperature Maps ◽  
Recombination Epoch ◽  
Frequency Temperature

The physics behind the origin and composition of the Cosmic Microwave Background (CMB) is a well-established topic in the field of Cosmology. Literature on CMB anisotropies reveal consistency with Gaussianity [1], but these were conducted on full multi-frequency temperature maps. In this thesis, we utilise clustering algorithms to specifically conduct statistical analyses on the distribution of hotspots in the CMB. We describe a series of data processing and clustering methodologies conducted, with results that conclusively show that the counts-in-cells distribution of hotspots in the CMB does not follow a Poisson distribution. Rather, the distribution exhibits a much closer fit to both the Negative Binomial Distribution (NBD) and the Gravitational Quasi-Equilibrium Distribution (GQED). From this result, we conclude that structure likely existed in the early universe, from the period of the recombination Epoch, possibly opening new insights in the field of galaxy formation.

Cosmic microwave background bispectrum of vector modes induced from primordial magnetic fields

2010 ◽  
Vol 82 (12) ◽  
Author(s):  
Maresuke Shiraishi ◽  
Daisuke Nitta ◽  
Shuichiro Yokoyama ◽  
Kiyotomo Ichiki ◽  
Keitaro Takahashi
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Primordial Magnetic Fields
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