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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Setting Limits on Supersymmetry Using Simplified Models
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Light weakly interacting massive particles.

Graciela B Gelmini1

  • 1Department of Physics and Astronomy, University of California, Los Angeles (UCLA), 475 Portola Plaza, Los Angeles, CA 90095, United States of America.

Reports on Progress in Physics. Physical Society (Great Britain)
|June 15, 2017
PubMed
Summary
This summary is machine-generated.

Light weakly interacting massive particles (WIMPs) are potential dark matter candidates. Recent experimental hints suggest WIMPs in a specific mass range, prompting further investigation despite no definitive discovery yet.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Cosmology

Background:

  • Weakly Interacting Massive Particles (WIMPs) are leading dark matter candidates.
  • Several dark matter searches have presented hints of light WIMPs in the GeV to tens of GeV mass range.
  • A notable coincidence of direct and indirect detection signals has increased interest in light WIMPs.

Purpose of the Study:

  • To review the current evidence for and against light WIMPs as dark matter candidates.
  • To discuss the impact of recent experimental hints on the field of dark matter research.
  • To outline future experiments and observations relevant to light WIMP detection.

Main Methods:

  • Review of experimental data from direct and indirect dark matter detection experiments.
  • Analysis of theoretical predictions for WIMP properties.
  • Synthesis of evidence from multiple observational approaches.

Main Results:

  • Multiple experimental hints suggest the possible existence of light WIMPs.
  • These hints, while not conclusive, have significantly influenced dark matter research directions.
  • The convergence of signals in specific mass and cross-section regions is noteworthy.

Conclusions:

  • The evidence for light WIMPs remains intriguing but inconclusive.
  • Further dedicated experiments and observations are crucial for confirmation or refutation.
  • The study of light WIMPs continues to be a dynamic area in dark matter research.