Dipolar Electromagetic Condensate

[Harry Costas]

Atlan
Thank you for the kind words
Keep Well

 

[Harry Costas]

[Submitted on 9 Aug 2024]

On the Origin of Magnetar Fields: Chiral Magnetic Instability in Neutron Star Crusts​

Clara Dehman, José A. Pons

We investigate the chiral magnetic instability in the crust of a neutron star as a potential mechanism for amplifying magnetic fields. This instability may become active when small deviations from chemical equilibrium are sustained over decades, driven by the star's gradual spin-down or residual heat loss. Our findings suggest that this mechanism can produce strong, large-scale magnetic fields consistent with models that align with observational data. Additionally, this instability naturally generates magnetic helicity in the star's crust, which is crucial for forming and maintaining strong dipolar toroidal fields, often invoked to explain magnetar observational phenomena. Our results offer a microphysically-based alternative to classical hydrodynamical dynamos for the origin of magnetar magnetic fields, addressing a long-standing debate in the field.

 

[Harry Costas]

[Submitted on 16 Aug 2024]

Reality of Inverse Cascading in Neutron Star Crusts​

Clara Dehman, Axel Brandenburg

The braking torque that dictates the timing properties of magnetars is closely tied to the large-scale dipolar magnetic field on their surface. The formation of this field has been a topic of ongoing debate. One proposed mechanism, based on macroscopic principles, involves an inverse cascade within the neutron star's crust. However, this phenomenon has not been observed in realistic simulations. In this study, we provide compelling evidence supporting the feasibility of the inverse cascading process in the presence of an initial helical magnetic field within realistic neutron star crusts and discuss its contribution to the amplification of the large-scale magnetic field. Our findings, derived from a systematic investigation that considers various coordinate systems, peak wavenumber positions, crustal thicknesses, magnetic boundary conditions, and magnetic Lundquist numbers, reveal that the specific geometry of the crustal domain - with its extreme aspect ratio - requires an initial peak wavenumber from small-scale structures for the inverse cascade to occur. However, this extreme aspect ratio limits the inverse cascade to magnetic field structures on scales comparable to the neutron star's crust, making the formation of a large-scale dipolar surface field unlikely. Despite this limitation, the inverse cascade can significantly impact the magnetic field evolution in the interior of the crust, potentially explaining the observed characteristics of highly magnetized objects with weak surface dipolar fields, such as low-field magnetars or central compact objects.

 

[Atlan0001]

Hello Atlan
I know what I'm talking about.
We are at the steps of understanding.
The model is not mine.
I give credit to those scientists who have done research for years.

So do I, Harry, particularly Planck, Einstein and Hawking, Schrodinger and Heisenberg, but it's still my model, my own mind's eye build and picture.

 

[Harry Costas]

I understand

Atlan said
So do I, Harry, particularly Planck, Einstein and Hawking, Schrodinger and Heisenberg, but it's still my model, my own mind's eye build and picture.

 

[Harry Costas]

To understand dipolar jets, scientists are experimenting to find ways of creating and controlling them, which may lead to the ultimate fuel in space travel.
Dipolar jets are found at the center of the Milkyway.
M87 the dipolar jet goes for 100,000 light years.


[Submitted on 19 Aug 2024 (v1), last revised 28 Aug 2024 (this version, v2)]

Topological phase transitions in perovskite superlattices driven by temperature, electric field, and doping​

Jiyuan Yang, Shi Liu

Many dipolar topological structures have been experimentally demonstrated in (PbTiO3)n/(SrTiO3)n superlattices, such as flux-closure, vortice, and skyrmion