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Related Concept Videos

Symmetric Member in Bending01:07

Symmetric Member in Bending

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In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
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Unsymmetric Bending - Angle of Neutral Axis01:15

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
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Unsymmetric Bending01:18

Unsymmetric Bending

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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Gauss's Law: Planar Symmetry01:27

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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Deformations in a Symmetric Member in Bending01:18

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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The shadow of dark matter as a shadow of string theory: string origin of the dipole term.

The European physical journal. C, Particles and fields·2020
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Constraints on antisymmetric tensor fields from Bhabha scattering.

Siddharth Tiwary1,2, Rainer Dick1

  • 1Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2 Canada.

The European Physical Journal. C, Particles and Fields
|January 3, 2022
PubMed
Summary

Antisymmetric tensor fields, predicted by string theory, could be detected via electromagnetic dipole moments. Bhabha scattering experiments provide the strongest constraints on these couplings, limiting their potential impact on particle physics.

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Area of Science:

  • Theoretical Physics
  • Particle Physics
  • String Theory

Background:

  • Antisymmetric tensor fields are a key prediction of string theory.
  • These fields may couple to electromagnetic dipole moments, offering a potential discovery avenue for string theory.
  • Electromagnetic dipole couplings are particularly sensitive to interactions with electrons.

Purpose of the Study:

  • To investigate the potential for detecting antisymmetric tensor fields through their electromagnetic dipole couplings.
  • To establish the strongest constraints on these couplings using experimental data.

Main Methods:

  • Analysis of Møller and Bhabha scattering processes, which are sensitive to electromagnetic dipole couplings.
  • Utilizing previous measurements of Bhabha scattering to derive constraints.

Main Results:

  • Previous Bhabha scattering measurements impose constraints on the couplings.
  • The constraints are expressed in terms of the antisymmetric tensor field mass and an effective mass scale for the dipole coupling.

Conclusions:

  • Antisymmetric tensor fields represent a promising target for particle physics searches.
  • Bhabha scattering experiments provide stringent limits on the electromagnetic dipole couplings associated with these fields, impacting string theory discovery potential.