Wednesday, January 29, 2020

Magnetars as additional support for monopole flux tubes

There is an interesting popular article about magnetars in Quanta Magazine (see this). The article tells about the latest findings of Zhou and Vink and colleagues (see this) giving hints about the mechanism generating the huge magnetic fields of magnetars.

Neutron stars have surface magnetic field of order 108 Tesla. Magnetars have surface magnetic field stronger by a factor 1000 - of order 1011 Tesla. The mechanism giving rise to so strong magnetic fields at the surface of neutron star is poorly understood. Dynamo mechanism is the first option. The rapidly rotating currents at the surface of neutron star would generate the magnetic field. Second model assumes that some stars simply have strong magnetic fields and the strength of these magnetic fields can vary even by factor of order 1000. Magnetars and neutron stars would inherit these magnetic fields. The model should also explain why some stars should have so strong magnetic fields - what is the mechanism generating them. In Maxwellian world currents would be needed in any case and some kind of dynamo model suggests itself.

Dynamo model requires very rapid rotation with rotation frequency measured using millisecond as a natural unit. The fast rotation rate predicts that magnetars are produced in more energetic explosions than neutron stars. The empirical findings however support the view that there is no difference between supernovas producing magnetars and neutron stars. Therefore it would seem that the model assuming inherited magnetic fields is favored.

What says TGD? TGD view about magnetic fields differs from Maxwellian view and this allows to understand the huge magnetic without dynamo mechanism and could give a justification for the inheritance model.

  1. TGD predicts that magnetic field decomposes to topological field quanta - flux tubes and sheets - magnetic flux tubes carry quantized magnetic flux. Flux tubes can have as cross section either open disk (or disk with holes) or closed surface not possible in Minkowskian space-time. The cross section can be sphere or sphere with handles.

  2. If the cross section is disk a current at its boundaries is needed to create the flux. If the cross section is closed surface, no current is needed and magnetic flux is stable against dissipation and flux tube itself is stable against pinching by flux conservation. These monopole fluxes could explain the fact that there are magnetic fields in cosmological scales not possible in Maxwellian theory since the currents should be random in cosmological scales.

    This also solves the maintenance problem of the Earth's magnetic field. Its monopole part would stable and 2/5 of the entire magnetic field BE=.5 Gauss from TGD based model of quantum biology involving endogenous magnetic field Bend=.2 Gauss identifiable in terms of monopole flux.

The model for the formation of astrophysical objects in various scales such as galaxies and stars and even planets and also for quantum biology relies crucially on monopole fluxes.
  1. The proposal (see this) is that stars correspond tangles formed to long monopole flux tube. Reconnection could of course give rise to closed short flux tubes and one would have kind of spaghetti.

    The interior of Sun would contain flux tubes containing dark nuclei as nucleon sequences and one ends up to a modification of the model of nuclear fusion based on the excitation of dark nuclei (see darkcore). The model solvs a 10 year old anomaly of nuclear physics of solar core discovered by Asplund et al. From the TGD based model of "cold fusion" one obtains the estimate that the flux tube radius is of order electron Compton length, and thus about heff/h0≈ mp/me∼ 2000 times longer than proton Compton length. This has been assumed also in the TGD based model of stars (see this).

  2. The final states of stars could correspond to a volume filling spaghettis of flux tube analogous to blackhole. They would be characterized by the radius of the flux tube, which would naturally correspond to a p-adic length scale L(k)∝ 2k/2: one could speak of various kinds of blackhole like entities (BHEs). There radius of the flux tube would be scaled up by the value of effective Planck constant heff=n× h0 so that one would have n∝ 2k/2 in good approximation.

  3. The p-adic length scales L(k), with k prime are good candidates for p-adic lengths scales. Most interesting candidates correspond to Mersenne primes and Gaussian Mersennes MG,k= (1+i)k-1. Ordinary blackhole could correspond to a flux tube with radius of order Compton of proton corresponding to the p-adic length scale L(107).

    For neutron star the first guess would be as the p-adic length scale L(127) of electron from the model of Sun.
    L(113) assignable to nuclei and corresponding to Gaussian Mersenne is also a good candidate for magnetar's p-adic length scale. L(109) assigned to deuteron would correspond to an object very near to blackhole corresponding to L(107) (see this). Also the surface and interior of BHE would carry enormous monopole fluxes 32 times stronger than for magnetars.

    The are just guesses but bringing in quantized monopole fluxes together with p-adic length scale hypothesis allows to develop a quantitative picture.

Consider first the flux quantization hypothesis more precisely.
  1. The observation that to the vision about monopole magnetic fields and hierarchy of Planck constants now derivable from adelic physics was that the irradiation of vertebrate brain by ELF frequencies induces physiological and behavioral effects which look like quantal. As if cyclotron transitions in endogenous magnetic field Bend= 2BE/5≈ 0.2 Gauss would have been in question. The energies of photons involved are however ridiculously small and cannot have any effects. The proposal was that the effective value of Planck constant is quantized: heff=nh0 and can have very large values in living matter. The energies E=hefff of photons could thus be over thermal threshold and have effects. The matter with non-standard value of heff would correspond to dark matter.

  2. One can make the picture more quantitative by considering the quantization of flux. The radius r of a flux tube carrying unit magnetic flux is known as magnetic length r2= Φ0/eπ B , where Φ0 corresponds to minimal quantized flux Φ0 =BS= Bπ r2= n× hbar/eB for flux tube having disk D2 as cross section. If Bend is ordinary Maxwellian flux one obtains for Bend=0.2 Gauss r= 5.8 μm which is rather near to L(169)= 5× 10-6 μm Cell membrane length scale L(151)= 10 nm corresponds to the scaling Bend→ 218Bend≈ 5 Tesla and 1 Tesla corresponds to the magnetic length r=2.23 × L(151).

    One can argue that one must have quantization of flux as multiples of heff. The geometric interpretation is that ℏeff=nℏ0 corresponds to n-sheeted structure (Galois covering) and the above quantization gives flux for a single sheet. The total flux as sum of these fluxes is indeed proportional to ℏeff.

  3. For monopole flux tubes disk D2 is replaced with sphere S2 and the area S=π× r2 in magnetic flux is replaced with S=4π r2. This means scaling r→ r/2 for the magnetic length. The p-adic length scale becomes L(167), which corresponds to Gaussian Mersenne is indeed the scale that might have hoped whereas the ordinary flux quantization giving L(169) was a disappointment. This gives a solution to a longstanding puzzle why L(169) instead of L(167) and additional support for monopole flux tubes in living matter. As a matter of fact, there are four Gaussian Mersennes corresponding to k∈ {151,157,163,167} giving rise to 4 p-adic length scales in the range [10 nm, 2.5 μm] in the biologically most important length scale range. This is a number theoretic miracle.

It is useful to list some numbers for monopole flux by using the scaling ∝ 1/L2(k)∝ 2-k/2 to get a quantitative grasp about the situation for magnetars and other final states of stars.
  1. For monopole flux L(151) corresponds to 216Bend(k=167) ≈ 1.28 Tesla. For ordinary flux it corresponds to 2.56 Tesla. A good mnemonic is that Tesla corresponds to r= 1.13× L(151).

  2. For neutron star one has B∼ 108 Tesla. For monopole flux this would correspond for ordinary flux magnetic length r≈ 1.13 pm roughly 2.8Le, where Le= .4 pm is electron Compton length. Note that the corresponding p-adic length scales is L(127)=2.5 pm ≈ 2.2r so that also interpretation in terms of L(125) can be considered. For non-monopole flux one would have roughly r=2.26 pm. Neutron star would be formed when all flux tubes become dark flux tubes and perhaps form single connected volume filling structure.

  3. For magnetar one has magnetic field about B=1011 Tesla roughly 1000 times stronger than for neutron star. For monopole flux this would give r= 30 fm to be compared with the nuclear p-adic length scale L(113)= 20 fm. Could the p-adic length scale L(109)= 2L(107)= 5 fm correspond to a state rather near to blackhole? L(109) would would have 16 times stronger surface magnetic field B≈ .45 × 1012 Tesla than magnetar. For the TGD counterpart of ordinary blackhole having k=107 the surface magnetic field B≈ 1.8 × 1012 Tesla would be 32 times stronger than for magnetar.

All these estimates are order of magnitude estimates and p-adic lengths scale hypothesis only says something about scales.

See the article Magnetars as a support for the notion of monopole flux tube, the longer article Cosmic string model for the formation of galaxies and stars or the chapter with the same title.

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

Articles and other material related to TGD.

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