Twisting endocytosis

Twisting S-branes

Smooth time dependent supergravity solutions corresponding to analytic continuations of Kerr black holes are constructed and limits with a local de Sitter phase are found. These solutions are non-singular due to a helical twist in space and a fine tuning of the energy flow in the spacetime. For the extremal limit in which the mass and twist parameters are equal the S-brane undergoes de Sitter e...

General Twisting of Algebras

We introduce the concept of pseudotwistor (with particular cases called twistor and braided twistor) for an algebra (A,μ, u) in a monoidal category, as a morphism T : A⊗ A → A ⊗ A satisfying a list of axioms ensuring that (A,μ ◦ T, u) is also an algebra in the category. This concept provides a unifying framework for various deformed (or twisted) algebras from the literature, such as twisted ten...

Twisting in a crowd

The scenery of the nucleus The nucleoplasm is no less dense, even though it contains neither membrane nor rigid filament. However, it contains one remarkable type of filament, the DNA, which, for a mammalian cell with a small nucleus, can account for close to 10% (100 mg m1-1) of the nuclear mass (including water). This is a very high concentration much higher than that generally used for exper...

Twisting of monoidal structures

This article is devoted to the investigation of the deformation (twisting) of monoidal structures, such as the associativity constraint of the monoidal category and the monoidal structure of monoidal functor. The sets of twistings have a (non-abelian) c ohomological nature. Using this fact the maps from the sets of twistings to some cohomology groups (Hochschild cohomology of K-theory) are cons...

The Twisting Lane