Http://www.nature.com/news/higgsogenesis-proposed-to-explain-dark-matter-1.13883
Hi Tapio,
Maybe, but there are still several solutions:
1) Totally new particles like axions and right-handed neutrinos. I would not put any money on supersymmetry, but people who worked with SUSY in mind and having spent millions on experiments are not willing to give up.
2) New interactions. If DM particles were self-interacting (SIDM) that would solve some of the hottest problems. But that does not tell WHAT the DM particles are.
3) One-parameter scalar-modified gravity
4) Two-parameter scalar-tensor models
Hi Tapio,
Maybe, but there are still several solutions:
1) Totally new particles like axions and right-handed neutrinos. I would not put any money on supersymmetry, but people who worked with SUSY in mind and having spent millions on experiments are not willing to give up.
2) New interactions. If DM particles were self-interacting (SIDM) that would solve some of the hottest problems. But that does not tell WHAT the DM particles are.
3) One-parameter scalar-modified gravity
4) Two-parameter scalar-tensor models
Tapio,
That paper begin with:
''A key riddle in cosmology may be answered by the 2012 discovery of the Higgs boson''
One of the primary objective for the construction of the supercollider was to experimentally test the existence of the Higgs boson. This has been achieved this year. Good. But I remember that about ten years ago reading an article saying that if the supercollider validated the existence of the Higgs boson as 99% of particle physicists expect it will and that it find nothing unexpected then it would be the worst scientific scenario because we will reassure in our theory but we would learn nothing new. So far no trace of supersymmetry, if this is confirme at higher energy levels then this could be something interesting.
The referenced Nature News report concludes quoting Manoj Kaplinghat, a theoretical physicist at the University of California, Irvine:
“We know that the Higgs exists, we know there’s dark matter and matter–antimatter asymmetry, and they’re trying to put three empirical facts together..."
The report discusses a new hypothesis explaining the still presumed "density of the mysterious dark matter that makes up five-sixths of the matter in the Universe" - some yet to be identified exotic dark matter particle - not its detection...
It has yet to be definitively determined that any undetectable, high mass exotic form of matter exists - especially at the scales of mass volumes that seem to be required by cosmological models...
Even if this hypothesis could explain the relative proportions of cosmological mass-energy attributed to dark matter, there is also the question of fine-tuning the amounts of dark matter inferred by evaluations of galaxies of varying mass-distributions, such as large spiral galaxies seeming to require large halo configurations of compensatory undetected mass, while evaluations of larger elliptical galaxies (thought to be formed from spiral mergers) seem to require little if any dark matter...
Ref:
Closing in on the Border Between Primordial Plasma and Ordinary Matter
http://www.bnl.gov/bnlweb/pubaf/pr/PR_display.asp?prID=1446
Definition of these primordial phases at Brookhaven National Lab
may result in dark matter and energy correlation explanations applicable to the present time.
These alternate density phases would not be picked up as
gaseous phase Baryonic Acoustic Oscillations at universe z~3000
as observed by Wilkinson Microwave Anisotropy Probe (WMAP)
and still be consistent with measured hydrogen/helium abundances (ratios).
Dark matter may be a direct result of these alternate Big Bang nucleosynthetic density phases and currently existing as a presently undetectable (except by gravity micro lensing and galactic rotational effect) extremely cold (~1E-16K) hydrogen Bose Einstein Condensate phase in thermal equilibrium with an extremely cold adiabatically expanding critical density (presently ~1E-29 g/cc).
http://xxx.lanl.gov/abs/physics/9905007
If the dark matter interacts with normal matter by some known form of
interaction (such as weak interactions), then that gives some hope.
That, it is possible to perform some form of experiment to detect it. WIMP is a
weakly interacting massive particle, then one can hope to discover in colliders.
On the contrary if dark matter has only gravitational interactions, then it changes
trajectories of stars, that is also some form of detection.
Problem is unless you guess its interaction, it is difficult to device an experiment for the detection of dark matter.
In other words detection strategy depends on the candidate particles.
Suresh
Could you give me an arXiv- reference to the Science paper you mentioned in this thread 26 days ago?
The "Nature" News article referenced in the question posting - http://www.nature.com/news/higgsogenesis-proposed-to-explain-dark-matter-1.13883 - stated:
"Tulin and Servant show that if the Higgs also interacted with dark matter—for example by generating dark-matter particles when it decays—it could produce a ratio of dark to visible matter that is just what we see in the universe today. Servant says that one consequence of the Higgs interacting in this way would be a new potential test for dark matter, which has so far proven difficult to see directly. When the Higgs decays to other particles [...] it would occasionally form dark-matter particles that could not be detected. Higgs decays at the LHC have not yet been studied closely enough to tell whether this is happening, but could be in future, Servant says."
The production of any dark matter particles produced by Higgs boson decay should be inferred by missing mass in the detected decay products - just as it is inferred by analytical interpretations of cosmological observations.
However, cosmological inferences of dark matter are mostly derived from mass estimates of vast compound structures (i.e., galaxies, etc.) and analytical projections of their expected gravitational effects - that conflict with observations.
Here the masses of the Higgs boson and its ordinary decay products have been much more precisely determined, and do not require gravitational evaluation - eliminating potential sources of error in cosmological inferences of dark matter. I strongly suggest that no such 'missing mass' will ever be identified in the decay products of Higgs bosons...
Suresh and James,
What Suresh refers to is not an article, it is just an 11-line abstract. Thus I could not get anything concrete out of it.
Suresh, the dark matter problem lies at galactic, not local scales. Any local mass imbalance would have been easily measured. Science does not endorse your comment, it only publishes what you wrote whether it makes any sense or not.
. Hyperbolic space-time and hyperbolic trajectory, not dark matter, can resolve the discrepancy between the flat rotation curves of stars within a galaxy and the rotation curves expected from Kepler's third law. According to Newton's law of gravity the orbit of Mercury around the sun should be a perfect ellipse with the sun at one focus. That's just Kepler's first law. Mercury was not precisely following its predicted orbit. The sun has the strongest gravitational field of any object in the solar system. Since according to general relativity the curvature of space-time is a direct measure of the strength of a gravitational field. As Mercury tries to move along an elliptical orbit, the orbit itself slowly moves. This effect called the precession of Mercury's perihelion. The gravity near the sun strong enough to warp space-time. Far away from the sun the space-time turns flat, the other planets obey Keplerian elliptical orbit. The same analogy can be applied to describe the trajectory of a galaxy within the hyperbolic space-time of its parent cluster. The hyperbolic space-time causes the galaxy to speed up as moved away from the center. Far away from the center the space-time return flat, while one could apply Vallado theorem for the hyperbolic trajectory in the flat space-time. The body traveling along hyperbolic trajectory will attain in infinity an orbital constant velocity called hyperbolic excess velocity. We developed the equation of motion in the hyperbolic spacetime that predicts the flat rotation curve without invoke Dark Matter.
Article The Big Bang hyperbolic universe neither needs inflation nor...
Friends of spooky physics like to speculate about the link between dark matter and black holes, see, e.g., A. Bogdan et al., The Astrophysical Journal 800 (2015), or O. Lennon et al., Journal of Cosmology and Astroparticle Physics 2018 (2018).
Let us wait and see.
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