Please register and log-in to create and edit pages

User Tools

    Please register and log-in to create and edit pages

Site Tools


Main Menu

Main menu
Click categories to expand

Other categories


A-Z listingplugin-autotooltip__plain plugin-autotooltip_bigA-Z listing

This is an alphabetical index of all content pages.


Also see

Importance Ratingsplugin-autotooltip__plain plugin-autotooltip_bigImportance ratings

In a departure from the usual Wiki format, Wikenigma assigns 'Importance Ratings' to some pages.

The idea is to separate articles which are considered (by the editors) to cover exceptionally important unknown issues from those which (although also u…

Newsplugin-autotooltip__plain plugin-autotooltip_bigNews

[ newest at the top ]

• Mar. 2021 : Many thanks to the The British Library, which has now begun permanently archiving the contents of Wikenigma.

• Jan. 2021 : A milestone of 600 unknown articles has been reached.

• Oct. 2020 : A milestone of 500 unknown article…

Contactsplugin-autotooltip__plain plugin-autotooltip_bigContacts

Use this form to send a message to Wikenigma . . . [ * note: all fields must be completed ]

Legalplugin-autotooltip__plain plugin-autotooltip_bigLegal

Content in general

Please note that in common with other publicly editable wikis, this website is not responsible for content posted by the public. Nevertheless, the ongoing editing process should be able to remove unsuitable content in a reasonable time. If you…

Donate/Sponsorplugin-autotooltip__plain plugin-autotooltip_bigDonate to Wikenigma . . .

The best way to donate is by adding new original content !

That can either be by contributing to an existing article, or by creating a new page with an as-yet-unlisted 'Known Unknown'.

Any registered user can create content.

Registerplugin-autotooltip__plain plugin-autotooltip_bigRegistration

At present, only registered users can create and edit articles.

If you'd like to register as a contributor, please request a password.

When filling in the form, make sure you supply a valid e-mail address, as the login password will be sent to that addre…


Wikenigma supports:


Utilities
rss / xml feed
sitemap file
A-Z listing (archived)plugin-autotooltip__plain plugin-autotooltip_bigA-Z listing (archived)

This is an older, partial A-Z listing intended for search engines only.

Last updated : March 2021

For an up-to-date list see A-Z listing in the Main Menu

Abracadabra etymology

Acamprosate

Acrocyanosis

Acupuncture

Attention-Deficit / Hypera…

Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown Science

Cosmological Constant Problem

The cosmological constant problem is the disagreement in 'measured' values of the cosmological constant and theoretical calculations of its value.

The cosmological constant was first proposed by Einstein as a mathematical necessity to rationalise how the universe has resisted collapsing under its own gravity. General relativity, however, predicts the vacuum energy density to be very different to its measured value (i.e. as needed to explain the measured expansion of the universe). There is no generally accepted explanation for this discrepancy, although numerous papers have been written about it.

“Quantum mechanics suggests the vacuum itself should fluctuate imperceptibly. In general relativity, those tiny quantum fluctuations produce an energy that would serve as the cosmological constant. Yet, it should be 120 orders of magnitude too big—big enough to obliterate the universe.”

It was examined in a 1994 paper for the American Journal of Physics (Volume 63, Issue 7) by Ronald J. Adler, Brendan Casey, and Ovid C. Jacob, who called it the 'Vacuum Catastrophe'. The paper described the spectacularly conflicting results of calculations of the energy density of a vacuum and actual 'measured' values.

“When summed up over all modes to some reasonable maximum this leads to an enormous energy density of the vacuum. Such an energy density presents serious problems when gravity is considered, since its gravitational field has not been observed; indeed the non-observation places an upper limit on the energy of the vacuum, which is in extreme conflict with the theoretical estimate: about 120 orders of magnitude!”
See: Vacuum catastrophe: An elementary exposition of the cosmological constant problem

Further reading : A 2107 article from Science linking the Cosmological Constant problem to Dark Energy


Also see :Vacuum energyplugin-autotooltip__plain plugin-autotooltip_bigVacuum energy

Quantum physics, and the widely accepted and experimentally tested Heisenberg Uncertainty Principle implies that no 'vacuum' can be truly empty. At all times, innumerable quantised 'virtual particles' must be coming into existence and then disappearing.…

Importance Rating


    Share this page :

X

Dear reader : Do you have any suggestions for the site's content?

Ideas for new topics, and suggested additions / corrections for old 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.)

Show another (random) page

DOKUWIKI IMPLEMENTATION DESIGN BY UNIV.ORG.UK MARCH 2021