fifth force

Also found in: Dictionary, Wikipedia.

fifth force,

postulated fifth basic forceforce,
commonly, a "push" or "pull," more properly defined in physics as a quantity that changes the motion, size, or shape of a body. Force is a vector quantity, having both magnitude and direction.
..... Click the link for more information.
 of nature (the four known forces of nature are gravity, electromagnetism, and the strong and weak interactions). Proposed in 1986 to account for gravitational discrepancies observed during some experiments, it was said to result in a repulsive effect about 1,000 times less powerful than gravity, and its strength was said to fall off quickly with distance, having a range of about 700 ft (200 m). The results of some initial experiments supported the possibility that the fifth force might exist, but later investigations, including a large-scale, highly accurate oceanic experiment, provided no evidence of such a force.
Mentioned in ?
References in periodicals archive ?
It doesn't end with potential personal wealth either; for once John and his associates begin working with the Fifth Force, they determine that any inventions from the force will of necessity look like a flying saucer - raising all kinds of questions about alien existence, space, and alien technology that spark a renewed quest for the truth in outer space.
Laboratory tests have found no sign of a fifth force but these experiments could not test for the force acting over great distances.
By refining and improving the computations, Derevianko said there is potential for a better understanding of hypothetical particles (extra Z-bosons), which could be carriers of a so-far elusive fifth force of nature.
It's an important result in their quest to become Scotland's fifth force.
Peter Ellwood said a Halifax/Bank of Scotland deal would confirm Lloyds TSB's view that the banking scene was likely to consolidate further, weakening Abbey's position as a potential fifth force to compete with the UK's four main banks.
If a fifth force exists at all, it would have to be much weaker than theorists had imagined.
This combination will focus on increasing competition by the creation of a fifth force in UK banking, something which is good news for consumers.
The emergence of a so-called fifth force to compete with the big four, particularly in small business banking, could also make it more likely that Lloyds TSB could get a green light from competition regulators to proceed with its pounds 19 billion unsolicited bid for Abbey National.
And particle physicists are pushing forward their search for the still-undiscovered top quark and a fifth force of nature required by the standard model to determine the masses of the elementary particles.
The decision would effectively create a fifth force in UK banking to compete with the big four - Barclays, HSBC, Lloyds TSB and the Royal Bank of Scotland.
20 NATURE, shows that a nongravitational, fifth force would contribute no more than 1 part in [10.
But industry sources said Bank of Scotland and Abbey were still aiming to do their deal, creating a fifth force in UK banking to compete with the big four - Barclays, HSBC, Lloyds and Royal Bank of Scotland.