NEGATIVE VISCOSITY

Manual skill generalization enhanced by negative viscosity.

Recent human-machine interaction studies have suggested that movement augmented with negative viscosity can enhance performance and can even promote better motor learning. To test this, we investigated how negative viscosity influences motor adaptation to an environment where forces acted only in one axis of motion. Using a force-feedback device, subjects performed free exploratory movements wi...

Universe models with negative bulk viscosity

The concept of negative temperatures has occasionally been used in connection with quantum systems. A recent example of this sort is reported in the paper of S. Braun et al. [Science 339, 52 (2013)], where an attractively interacting ensemble of ultracold atoms is investigated experimentally and found to correspond to a negative-temperature system since the entropy decreases with increasing ene...

Negative viscosity effect in three-dimensional flows

Manual skill generalization enhanced by negative viscosity 1 2

18 Recent human-machine interaction studies have suggested that movement augmented with 19 negative viscosity can enhance performance and can even promote better motor learning. To test 20 this we investigated how negative viscosity influences motor adaptation to an environment where 21 forces acted only in one axis of motion. Using a force-feedback device, subjects performed free 22 explorator...

Electron viscosity, current vortices and negative nonlocal resistance in graphene

Quantum-critical strongly correlated electron systems are predicted to feature universal collision-dominated transport resembling that of viscous fluids1–4. However, investigation of these phenomena has been hampered by the lack of known macroscopic signatures of electron viscosity5–9. Here we identify vorticity as such a signature and link it with a readilyverifiablestrikingmacroscopicd.c. tra...