V. M. H. Ruutu

TL;DR: In this article, the primordial fireball was simulated using a neutron-induced nuclear reaction to heat small regions of liquid 3He above the superfluid transition temperature, leading to the formation of a random network of vortices (the superfluid analogue of cosmic strings).

TL;DR: In this paper, the authors reported the observation of vortex formation upon the absorption of a thermal neutron in a rotating container of superfluid $3$He-B. The nuclear reaction n + $^3$H = p + $ 3$H + 0.76MeV heats a cigar shaped region of the superfluid into the normal phase.

TL;DR: In this article, the critical velocity at which a rotating cylinder becomes unstable against the formation of quantized vortex lines with continuous (singularity-free) core structure was measured, and it was shown that the instability is due to a dependence on the texture of the orbital angular momentun axis.

TL;DR: In this article, the authors measured the critical angular velocity Ωc(T, P) at which vortices start to form in slowly accelerating rotation in a cylindrical container filled with 3He-B.

TL;DR: In this paper, it was shown that a nucleation event takes place whenever the flow exceeds the critical velocity vc(T, p) locally at nucleation site and the nucleation barrier vanishes.