Torsion

Torsion may refer to:

Science

 * Torsion (mechanics), the twisting of an object due to an applied torque
 * Torsion of spacetime, the field used in Einstein–Cartan theory and
 * Alternatives to general relativity
 * Torsion angle, in chemistry

Biology and medicine

 * Torsion fracture or spiral fracture, a bone fracture when torque is applied
 * Organ torsion, twisting that interrupts the blood supply to that organ:
 * Splenic torsion, causing splenic infarction
 * Ovarian torsion
 * Testicular torsion
 * Penile torsion, a congenital condition
 * Torsion of the digestive tract in some domestic animals:
 * Torsion, a type of horse colic
 * Gastric torsion, or gastric dilatation volvulus
 * Torsion (gastropod), a developmental feature of all gastropods

Mathematics

 * Torsion of a curve
 * Torsion tensor, in differential geometry
 * Torsion (algebra), in ring theory
 * Torsion group, in group theory and arithmetic geometry
 * Tor functor, the derived functors of the tensor product of modules over a ring
 * Torsion-free module, in algebra
 * See also Torsion-free (disambiguation)
 * Analytic torsion (Reidemeister torsion, R-torsion, Franz torsion, de Rham torsion, Ray-Singer torsion), a topological invariant of manifolds
 * Whitehead torsion, in geometric topology

Other uses

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