Safe Policies for Reinforcement Learning via Primal-Dual Methods. (arXiv:1911.09101v1 [eess.SY])

In this paper, we study the learning of safe policies in the setting of reinforcement learning problems. This is, we aim to control a Markov Decision Process (MDP) of which we do not know the transition probabilities, but we have access to sample trajectories through experience. We define safety as the agent remaining in a…

The PanEDM Neutron Electric Dipole Moment Experiment at the ILL. (arXiv:1911.09161v1 [physics.ins-det])

The neutron’s permanent electric dipole moment $d_n$ is constrained to below $3\times10^{-26} e~\text{cm}$ (90% C.L.) [ arXiv:hep-ex/0602020, arXiv:1509.04411 ], by experiments using ultracold neutrons (UCN). We plan to improve this limit by an order of magnitude or more with PanEDM, the first experiment exploiting the ILL’s new UCN source SuperSUN. SuperSUN is expected to provide…

On Universal Features for High-Dimensional Learning and Inference. (arXiv:1911.09105v1 [cs.LG])

We consider the problem of identifying universal low-dimensional features from high-dimensional data for inference tasks in settings involving learning. For such problems, we introduce natural notions of universality and we show a local equivalence among them. Our analysis is naturally expressed via information geometry, and represents a conceptually and computationally useful analysis. The development reveals…

Long-time asymptotics of solutions to the Keller–Rubinow model for Liesegang rings in the fast reaction limit. (arXiv:1911.09111v1 [math.AP])

We consider the Keller–Rubinow model for Liesegang rings in one spatial dimension in the fast reaction limit as introduced by Hilhorst, van der Hout, Mimura, and Ohnishi in 2007. Numerical evidence suggests that solutions to this model converge, independent of the initial concentration, to a universal profile for large times in parabolic similarity coordinates. For…

Spontaneous electron emission from hot silver dimer anions: Breakdown of the Born-Oppenheimer approximation. (arXiv:1911.09170v1 [physics.atm-clus])

We report the first experimental evidence of spontaneous electron emission from a homonuclear dimer anion through direct measurements of $\rm{Ag}_2^- \rightarrow \rm{Ag}_2 + \rm{e}^-$ decays on milliseconds and seconds time scales. This observation is very surprising as there is no avoided crossing between adiabatic energy curves to mediate such a process. The process is weak…

Observation of Magic Angle and Wall State in Twisted Bilayer Photonic Graphene. (arXiv:1911.09174v1 [cond-mat.mes-hall])

Graphene, a one-layer honeycomb lattice of carbon atoms, exhibits unconventional phenomena and attracts much interest since its discovery. Recently, an unexpected Mott-like insulator state induced by moir\’e pattern and a superconducting state are observed in magic-angle-twisted bilayer graphene, especially, without correlations between electrons, which gives more hints for the understanding and investigation of strongly correlated…

Periodic behavior in families of numerical and affine semigroups via parametric Presburger arithmetic. (arXiv:1911.09136v1 [math.CO])

Let $f_1(n), \ldots, f_k(n)$ be polynomial functions of $n$. For fixed $n\in\mathbb{N}$, let $S_n\subseteq \mathbb{N}$ be the numerical semigroup generated by $f_1(n),\ldots,f_k(n)$. As $n$ varies, we show that many invariants of $S_n$ are eventually quasi-polynomial in $n$, such as the Frobenius number, the type, the genus, and the size of the $\Delta$-set. The tool we…

Mid-infrared polarized emission from black phosphorus light-emitting diodes. (arXiv:1911.09184v1 [physics.app-ph])

The mid-infrared (MIR) spectral range is of immense use for civilian and military applications. The large number of vibrational absorption bands in this range can be used for gas sensing, process control and spectroscopy. In addition, there exists transparency windows in the atmosphere such as that between 3.6-3.8 $\mu$m, which are ideal for free-space optical…

Motion control for autonomous heterogeneous multi-agent area search in uncertain conditions. (arXiv:1911.09137v1 [math.OC])

Using multiple mobile robots in search missions offers a lot of benefits, but one needs a suitable and competent motion control algorithm which is able to consider sensors characteristics, the uncertainty of target detection and complexity of needed maneuvers in order to make a multi-agent search autonomous. This paper provides a methodology for an autonomous…