scholarly journals Dark sound: Collective modes of the axionic dark matter condensate

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
Alexander V. Balatsky ◽  
Benjo Fraser ◽  
Henrik S. Røising
Keyword(s):  
Dark Matter ◽  
Collective Modes

scholarly journals Comments on axions, domain walls, and cosmic strings

2021 ◽  
Vol 2021 (11) ◽  
pp. 041
Author(s):  
Michael Dine ◽  
Nicolas Fernandez ◽  
Akshay Ghalsasi ◽  
Hiren H. Patel
Keyword(s):  
Dark Matter ◽  
Domain Walls ◽  
Cosmic Strings ◽  
Collective Modes ◽  
Plausible Candidate ◽  
The Subject

Abstract Axions have for some time been considered a plausible candidate for dark matter. They can be produced through misalignment, but it has been argued that when inflation occurs before a Peccei-Quinn transition, appreciable production can result from cosmic strings. This has been the subject of extensive simulations. But there are reasons to be skeptical about the possible role of axion strings. We review and elaborate on these questions, and argue that parametrically strings are already accounted for by the assumption of random misalignment angles. We review and elaborate on these questions, and provide several qualitative arguments that parametrically strings are already accounted for by the assumption of random misalignment angles. The arguments are base on considerations of the collective modes of the string solutions, on computations of axion radiation in particular models, and reviews of simulations.

Density waves in disk galaxies

1967 ◽  
Vol 31 ◽  
pp. 313-317 ◽  
Author(s):  
C. C. Lin ◽  
F. H. Shu
Keyword(s):  
Mathematical Analysis ◽  
Spiral Structure ◽  
Stellar System ◽  
Collective Modes ◽  
Disk Galaxies ◽  
Spiral Pattern ◽  
Density Waves ◽  
The Galaxy ◽  
Detailed Mathematical Analysis

Density waves in the nature of those proposed by B. Lindblad are described by detailed mathematical analysis of collective modes in a disk-like stellar system. The treatment is centered around a hypothesis of quasi-stationary spiral structure. We examine (a) the mechanism for the maintenance of this spiral pattern, and (b) its consequences on the observable features of the galaxy.

Existence of RNA 'dark matter' in doubt

Nature ◽  
2010 ◽  
Author(s):  
Melissa Lee Phillips
Keyword(s):  
Dark Matter

Constraints on the Clumpiness of Dark Matter Halos Through Heating of Disk Galaxies

2003 ◽  
Vol 10 ◽  
pp. 95-95
Author(s):  
E. Ardi ◽  
T. Tsuchiya ◽  
A. Burkert
Keyword(s):  
Dark Matter ◽  
Disk Galaxies ◽  
Dark Matter Halos
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