All physical objects have ‚Äėmass‚Äô. The mass is (largely) a consequence of the additions of the masses of the atomic and subatomic particles from which the objects are comprised. Theorists currently support the idea of mass-creation via the Higgs Mechanism. See Wikipedia
But Higgs theory doesn't explain how or why subatomic particles themselves have wildly differing masses. For example, the 'up' and 'down' quarks which make up protons and neutrons, have different masses (by a factor of 2) - and the 'top' quark has a measured mass approaching that of some entire atoms.
There is also no explanation as to why the masses of some particles are ‚Äú100 quadrillion times smaller‚ÄĚ than theory would suggest. Source :'The Higgs mass mystery' New Scientist, Nov. 2015.
Further, as well as the current theories that put 'ordinary' matter as accounting for just 5% (or so) of the mass of the universe (see:and ) the Higgs theory only accounts for around 2% of this 5%.
[‚Ä¶] these current-quark masses leave 98% of the mass of the atom unexplained.‚Äú
Put another way, this means that only around 0.1% of the mass of 'ordinary matter' is currently explained.
A further complication is that the mass of the Higgs particle itself has yet to be explained. ‚ÄĚ[‚Ä¶] the problem cannot even be formulated in the strict context of the Standard Model‚Äú
Note: A new (2016) (US/Japan/China) study details theoretical and experimental research on supercooled rubidium which claims to demonstrate 'Negative Mass'.
Theoretically, a 'Negative Mass' object would move towards a force attempting to accelerate it, or would fall upwards in a gravitational field (etc etc).
Negative mass can be realized in quantum systems by engineering the dispersion relation. A powerful method is provided by spin-orbit coupling, which is currently at the center of intense research efforts. Here we measure an expanding spin-orbit coupled Bose-Einstein condensate whose dispersion features a region of negative mass.‚ÄĚ
Source : Negative mass hydrodynamics in a spin-orbit‚Äďcoupled Bose-Einstein condensate
Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.
If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !
Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.
( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)
You are currently viewing an auto-translated version of Wikenigma
Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.
Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.