Monday, November 20, 2017

Long range magnetic fields at distance of 5 billion light years and death blow to dark matter disks

Last saturday was one of those days when FB is suddenly full of fascinating experimental findings having direct relevance for TGD. Here I comment only two findings related to cosmology and astrophysics.

Long range magnetic fields detected at distance of 5 billion light years

It has been found that long range magnetic fields in microgauss range exists at distance of about 5 billion light years (see this).

The presence of cosmic magnetic fields is one of the mysteries challenging not only the existing cosmological models but even the standard model itself. Due to high temperatures there are no long range currents and there should be no long range magnetic fields in early cosmology and also the mechanism for their emergence later has remained mystery.

The observations, in particular the observations described in the article, are in conflict with the standard model view. The TGD explanation is direct implication of the assumption space-time is surface in M4×CP2. CP2 has non-trivial homology: one can regard it as having 4-D space with Euclidian signature of metric and carrying as topological magnetic monopole flux. No magnetic charge but non-trivial magnetic flux over homologically non-trivial 2-surfaces.

At space-time level this implies the existence of cosmic strings carrying monopole flux and having huge magnetic energy per unit length: they are essentially objects with 2-D M4 projection obeying string dynamics (minimal surface) and having 2-D complex surface as CP2 projection. No currents are needed to create these magnetic fields and they are stable for purely topological reasons. The very early universe would consist of a gas or plasma like state of cosmic strings.

After that the TGD analog of inflationary period took place and the projections M4 of flux tubes became 4-D. Cosmic strings started to thicken and magnetic fields gradually weakened. The prediction that magnetic fields were strongest in the early universe conforms with the observations. Standard model predicts just the opposite and cannot even provide a plausible mechanism for how they could have got stronger.

Other predictions are a detailed model for galactic dark matter associated with thickening cosmic strings. No dark matter halo is predicted and automatically correct prediction for the velocity spectrum of distant stars follows.

See the the chapter Breaking of CP, P, and T in cosmological scales in TGD Universe of "Physics in Many-Sheeted Space-Time ".

Death blow to dark matter disks

The standard view about dark matter is as a halos associated with galaxies and also other astrophysical objects. Nature however seems to be reluctant to behave according to the dictates of halo theorists. The reproduction of the simple flat velocity spectrum for distant stars in galactic plane requires tuning of the parameters characterizing the dark mass distribution in the halo. There is also a small constant density core around the center of galaxy behaving like rigid body rather than a density peak with maximum at the center. Also the attempts to detect various exotic particles proposed to serve as building bricks of dark matter have chronically failed. Quite recently very old galaxies which do not have dark matter have been found.

The latest trouble of the model, one might say a death blow, is that dark matter disks do not seem to exist at all (see this)! I am afraid that this means serious funding problems for the model builders.

The death of one idea is the victory of second one. I have been preaching for almost two decades that galactic dark matter along cosmic string containing galaxies like pearls in necklace: there would be no dark matter halo (see this, this, and this). The model predicts correct velocity profile for distant stars without furher assumptions: the value of string tension determines the value of the velocity. The model solvs a multitude of anomalies of halo model, and leads to a rather detailed model for evolution of galaxies and also provides insights to problems like matter-antimatter asymmetry.

See the the chapter TGD and astrophysics of "Physics in Many-sheeted Space-time".

For a summary of earlier postings see Latest progress in TGD.

Articles and other material related to TGD.


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