Exploring the Magnetic Universe: Pulsars, Homogeneity, and Galactic Cores

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In summary: Therefore, the cosmological constant's repulsion may be exceeded locally, for a time.In summary, the conversation discusses the possibility of the universe, after doubling its current age, coalescing all matter into pulsars with a strong magnetic field. It is questioned whether the expanding universe would outstrip the magnetic attraction between pulsars and if this would cause the universe to lose its homogeneity or form "magnetic galactic" cores. There is also a mention of the possibility of magnetic fields affecting spacetime and potentially negating the effects of the cosmological constant.
  • #1
Loren Booda
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Assume the universe, after an eventful life doubling our current age, has coalesced all matter into pulsars each with magnetic field of 1014 Gauss. Given the number of pulsars in this observable universe to be 1022, initially distributed homogeneously, at what radius would the expanding (H0=65 km s-1 Mpc-1) universe outstrip the average magnetic attraction between pulsars? In this scenario, might the universe lose its homogeneity over time, or form "magnetic galactic" cores within the forementioned radius?
 
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  • #2
Greetings !
Originally posted by Loren Booda
Assume the universe, after an eventful life doubling our current age, has coalesced all matter into pulsars...

Why would it do that ?!

"Does dice play God ?"

Live long and prosper.
 
  • #3
drag-

Pulsars are one quite probable end state for stars in our universe, and have an extremely dense quantum magnetic field.

Even more probable is the nuclear equilibrium that stars evolve eventually into pure iron. (Many pulsars have a 1/2 mile crust of iron!) Remember that purely iron stars would have not nearly as strong ferromagnetic field as pulsars, but would themselves make an interesting substitution into the originally proposed problem.
 
  • #4
Greetings !

Hmm...
Iron it is, of course.
However, as I heard (unless the Big Rip or something
happens before that), by the time that much of the
Universe becomes iron the CMBR is going to be
extremely low up the spectrum (with hardly much
other radiation) and except some huge BH's that
survive we'll just have iron spread all over.
Then again, maybe it does follow from it...
Anyway, aren't the distances going to be too great
to really effect each other ?

"Does dice play God ?"

Live long and prosper.
 
  • #5
drag-

Remember that ferromagnetic dipoles have in general a much stronger mutual attraction than do their corresponding gravitational masses.
 
  • #6
Greetings !

Hmm... Well, I guess your possibility
is certainly possible. But, of course that it
depends upon the way the Universe will evolve.
If the expansion is indeed accelerated all the
time then this probably won't be the case.
I think your enitial question is also complicated
by the fact that you need a reliable estimate
about when such pulsars may form.
(Even if you consider no real changes in the
Universe across such a large time scale as tens
of billions of years. And, of course, even now we
know that H0 is growing.)

"Does dice play God ?"

Live long and prosper.
 
  • #7
drag-

My concern that you raise is whether the cosmological constant/quintessence is great enough always to negate any significant effect by magnetism. Remember that smaller-scale "magnetic galaxies" may still, if temporarily, form under outward acceleration as "gravitational galaxies" formed in Hubble-expansion environment.
 
  • #8
Greetings !
Originally posted by Loren Booda
drag-

My concern that you raise is whether the cosmological constant/quintessence is great enough always to negate any significant effect by magnetism. Remember that smaller-scale "magnetic galaxies" may still, if temporarily, form under outward acceleration as "gravitational galaxies" formed in Hubble-expansion environment.
Well, since we have no exact answers from
cosmology estimates for such time scales
are a great problem.
BTW, are you suggesting that magnetic fields can
"pull" space itself back together ?

Live long and prosper.
 
  • #9
drag
BTW, are you suggesting that magnetic fields can
"pull" space itself back together
Good point. Indirectly, the magnetic interaction affects spacetime by accelerating relatively the masses involved.
 

1. What are pulsars and how do they work?

Pulsars are rapidly rotating, highly magnetized neutron stars that emit beams of electromagnetic radiation. They work by converting the rotational energy of the star into electromagnetic energy, which is then emitted as radio waves, visible light, and other forms of radiation.

2. How does the concept of homogeneity apply to the magnetic universe?

Homogeneity refers to the idea that the magnetic universe is similar and consistent on large scales. This means that the properties of magnetic fields, such as strength and direction, are relatively uniform throughout the universe.

3. What role do galactic cores play in the magnetic universe?

Galactic cores, or the central regions of galaxies, are important in the study of the magnetic universe because they often contain extremely strong magnetic fields. These fields can influence the formation and evolution of galaxies, as well as the behavior of matter and radiation within them.

4. How do scientists explore the magnetic universe?

Scientists use a variety of techniques to explore the magnetic universe, including observations from telescopes and spacecraft, computer simulations, and theoretical models. By combining data from these different approaches, we can gain a better understanding of the complex magnetic processes at work in the universe.

5. What are some potential applications of studying the magnetic universe?

Studying the magnetic universe can help us better understand the origins and evolution of galaxies, as well as the behavior of matter and radiation in extreme environments. It also has practical applications, such as improving our understanding of space weather and developing new technologies for space exploration.

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