Six years of the fifth force

  title={Six years of the fifth force},
  author={E. Fischbach and C. Talmadge},
The enunciation of the 'fifth force' hypothesis in 1986 spawned a generation of experiments searching for deviations from newtonian gravity. Although no compelling evidence for any new weak forces has emerged in the past six years, the searches for anomalous gravitational effects have produced a large number of important experimental and theoretical results. 
Short range gravitational fields: Rise and fall of the fifth force
During the 80's, some experiments and the repetitions of old ones, lead to the hypothesis of a fifth force. Nevertheless, a more accurate research was not able to confirm this hypothesis. ThisExpand
The Fifth Force, the Sixth Force and the Spring Force
Upon  revisiting the famous Pound-Rebka-Snider experiments on the gravitational red-shift , the fifth and even the sixth force in nature are in fact the stretching and compression force of the springExpand
The fifth force: An enigma in this Universe
In an attempt to explain some of the unknown phenomena of nature, including dark energy and dark matter, we explore the possibility of the existence of a fifth fundamental force of nature as also c...
The Fifth Force Since 1991
At the 1990 Moriond workshop, attended by many of those working on the Fifth Force, Orrin Fackler stated: “The Fifth Force is dead.” No one disagreed. At the time there was no evidence that such aExpand
The Rise and Fall of the Fifth Force
In 1986 Ephraim Fischbach, Sam Aronson, and Carrick Talmadge proposed a modification of Newton’s law of universal gravitation. This modification changed the gravitational potential from V = −Gm1m2∕rExpand
Experimental searches for extra-gravitational forces in the submillimetre range
We report on our efforts to give direct limits to the existence of forces other than gravitational ones in the submillimetre range. The technique used involves looking at the expected shifts to theExpand
Test of unparticle long range forces from perihelion precession of Mercury
Unparticle exchange gives rise to long range forces which deviate from the inverse square law due to the noncanonical dimension of unparticles. It is well known that a potential of the form r{sup -n}Expand
Solar system constraints on R$^n$ gravity
Recently, gravitational microlensing has been investigated in the framework of the weak field limit of fourth order gravity theory. However, solar system data (i.e. planetary periods and lightExpand
Recent results on short-range gravity experiment
According to the ADD model [1], deviation from Newton's inverse square law is expected at below sub-millimeter scale. Present study is an experimental investigation of the Newton's gravitational lawExpand
Theory and Experiment in Gravitational Physics: Tests of the Strong Equivalence Principle
We discuss tests of the Strong Equivalence Principle. We derive the observable consequences of the Nordtvedt effect, a violation of the equality of acceleration of massive, self-gravitating bodies,Expand


Experimental examination of the gravitational inverse square law
IN a previous paper1 we pointed out that earlier data on the measurement of the gravitational constant suggest a systematic shift in the value with the separation of the masses. This laboratory hasExpand
Galilean test for the fifth force.
The differential acceleration between two different materials falling in the Earth's gravitational field was measured to be less than 5 parts in 10/sup 10/ of the normal gravitational acceleration, putting new limits on the strength and range of the proposed fifth force. Expand
A model is proposed which allows a dilaton to show up in a possible non-Newtonian part of the gravitational force. By examining the available observational facts it can be shown that the force-rangeExpand
Limit on the strength of intermediate-range forces coupling to isospin.
The bound on the strength of any intermediate-range forces coupling to N-Z of nuclei to be less than 3.0 x 10/sup -3/ of gravity per baryon, for all ranges lambda>3 m. Expand
Limits on the existence of a material-dependent intermediate-range force.
An Eoetvoes-type experiment at a site with a significant slope in the terrain finds an intermediate-range force coupled to baryon number (N+Z) and the product of strength and range lambda to be ..cap alpha../sub 0/ and ..capAlphaSub 0/ respectively. Expand
Theoretical ideas of the fifth force(s) are reviewed, placing emphasis on the issue of how one can derive the two most important properties: the coupling strength roughly comparable with, or somewhatExpand
On weaker forces than gravity
Abstract The limits on hypothetical new interactions with a range accessible to detection by laboratory and geophysical experiments are briefly reviewed, and the limits at larger distances imposed byExpand
Geophysics and the law of gravity
Geophysical measurements of the gravitational constant and a recent reexamination of experiments performed early in the century on the equivalence of inertial and gravitational mass may have providedExpand
Search for a short-range, isospin-coupling component of the fifth force with use of a beam balance.
  • Speake, Quinn
  • Physics, Medicine
  • Physical review letters
  • 1988
An experiment designed to search for a short-range, isospin-coupling component of the fifth force found the value for the coupling constant xi to be (0.1 +- 3.0) x 10/sup -2/. Expand
An experimental test of the inverse square law of gravitation at range of 0.1 m
Theories attempting to unify gravitation with other interactions of Nature assume that the gravitational force arises from the exchange of particles. Several authors have predicted deviations,Expand