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In order to elucidate the process underpinning the apparently counterintuitive phenomena observed in the freefall experiments conducted by E. Hamm and J. Geminard [Amer. J. Phys. 78, 828 (2010)], we construct a simple dynamical model of a vertically falling train of one-dimensional rigid segments impinging onto an inelastic horizontal plate in three-dimensional space. Numerically integrating the nonlinear governing equations, we obtain a robust result that the train of rigid segments falls virtually faster than freefall under gravity. The presented model reproduces the coiling spontaneously formed in the pile, which is considered to be a key mechanism of the phenomenon and is shown to be a consequence of the three-dimensional spiral structure that arises due to dissipative locking in mid-air. As one of mechanical keys underpinning the apparently counterintuitive phenomena, we will here focus the downward tensile force exerted by the pile.
We study a freely falling graviton propagating in AdS in the context of the D1D5 CFT, where we introduce an interaction by turning on a deformation operator. We start with one left and right moving boson in the CFT. After applying two deformation ope
We take a closer and new look at the effects of tidal forces on the free fall of a quantum particle inside a spherically symmetric gravitational field. We derive the corresponding Schrodinger equation for the particle by starting from the fully relat
Deciding whether a family of disjoint line segments in the plane can be linked into a simple polygon (or a simple polygonal chain) by adding segments between their endpoints is NP-hard.
Particle beams are important tools for probing atomic and molecular interactions. Here we demonstrate that particle beams also offer a unique opportunity to investigate interactions in macroscopic systems, such as granular media. Motivated by recent
We introduce a simple model of dynamical supersymmetry breaking. It is like a supersymmetric version of a Nambu--Jona-Lasinio model with a spin one composite. The simplest version of the model as presented here has a single chiral superfield (multipl