A foundational question in relativistic fluid mechanics concerns the properties of hydrodynamic gradient expansion at large orders. We establish precise conditions under which this diverges for a broad class microscopic theories admitting limit, linear regime. Our result does not rely on highly symmetric flows utilized by previous studies heavy-ion collisions and cosmology. The whenever energy ...

An accurate description of the optical response subwavelength metallic particles and nanogap structures is a key problem plasmonics. Quantum hydrodynamic theory (QHT) has emerged as powerful method to calculate nanoparticles (NPs) since it takes into account nonlocality spill-out effects. Nevertheless, absorption spectra NPs obtained with conventional QHT, i.e., incorporating Thomas-Fermi (TF) ...

The unicellular green alga Chlamydomonas swims with two flagella that can synchronize their beat. Synchronized beating is required to swim both fast and straight. A long-standing hypothesis proposes that synchronization of flagella results from hydrodynamic coupling, but the details are not understood. Here, we present realistic hydrodynamic computations and high-speed tracking experiments of s...

Keywords: Micro-swimming Micro-flows Resistive force theory Hydrodynamic interaction Bio-inspired robots Surrogate models a b s t r a c t Research on micro-swimming robots without tether is growing fast owing to their potential impact on minimally invasive medical procedures. Candidate propulsion mechanisms of robots are vastly based on microorganisms with rotating helical tails. For design of ...