Torsion

Torsion may refer to:

Mathematics

• Torsion of a curve
• Torsion tensor in differential geometry
• Torsion (algebra)
• Torsion group in group theory and arithmetic geometry
• Tor functor
• Torsion-free module
• Reidemeister torsion (also called R-torsion, Franz torsion, de Rham torsion) and analytic torsion (also called Ray-Singer torsion)
• Whitehead torsion

Chemistry

• Torsion angle

Medicine

• Of bones, "torsion fracture" is another term for spiral fracture.
• Of organs, torsion refers to twisting, in particular twisting that interrupts the blood supply to that organ, e.g. splenic torsion, ovarian torsion, or testicular torsion.
• Torsion of the digestive tract in some domestic animals:
  • A type of horse colic
  • A complication of gastric dilatation volvulus (gastric torsion)

Physics and engineering

• Torsion (mechanics)
• The field used in Einstein–Cartan theory and other alternatives to general relativity that involve torsion of spacetime

Pseudoscience

• Torsion field (pseudoscience), a field alleged to make faster-than-light communication and paranormal phenomena possible

Biology

• Torsion (gastropod), a developmental feature of all gastropods