Undocumented Migrants as New (and Peaceful) American Revolutionaries

This essay situates undocumented migrants in the history of the American revolutionary period. The lawbreaking of both groups produced constructive legal and social change. For example, the masses of American revolutionaries and many of their leading men fought to rid the colonies of hereditary aristocracy. Colonists had come to cherish the proto-meritocracy that had bloomed on colonial shores and rankled at local evidence of aristocratic privilege, like the Crown’s grant of landed estates to absentee English aristocrats. Today’s equivalent hereditary aristocracy is the citizenry of wealthy democracies like the United States. Hereditary citizens use immigration restrictions to reserve the wealth and privilege of rich-world citizenship for themselves and invited guests. The undocumented peacefully challenge this status quo by migrating and remaining in the United States without permission, securing citizenship for their American-born children, and protesting that “no one is illegal.” In these ways the undocumented seize some of the aristocratic privileges of American citizenship and fight for others. For this and other reasons, the undocumented are contemporary heirs to the revolutionary moment—the true tea partiers of the twenty-first century

Daphnis placida, a new species of Sphinx moth for Guam, U.S.A.

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Gluck twist on a certain family of 2-knots

We show that by performing the Gluck twist along the 2-knot $K^2_{pq}$ derived from two ribbon presentations of the ribbon 1-knot $K(p,q)$ we get the standard 4-sphere $S^4$. In the proof we apply Kirby calculus.Comment: 11 pages, 12 figure

Symmetry and the thermodynamics of currents in open quantum systems

Symmetry is a powerful concept in physics, and its recent application to understand nonequilibrium behavior is providing deep insights and groundbreaking exact results. Here we show how to harness symmetry to control transport and statistics in open quantum systems. Such control is enabled by a first-order-type dynamic phase transition in current statistics and the associated coexistence of different transport channels (or nonequilibrium steady states) classified by symmetry. Microreversibility then ensues, via the Gallavotti-Cohen fluctuation theorem, a twin dynamic phase transition for rare current fluctuations. Interestingly, the symmetry present in the initial state is spontaneously broken at the fluctuating level, where the quantum system selects the symmetry sector that maximally facilitates a given fluctuation. We illustrate these results in a qubit network model motivated by the problem of coherent energy harvesting in photosynthetic complexes, and introduce the concept of a symmetry-controlled quantum thermal switch, suggesting symmetry-based design strategies for quantum devices with controllable transport properties.Comment: 12 pages, 6 figure

Hypervelocity Richtmyer–Meshkov instability

The Richtmyer-Meshkov instability is numerically investigated for strong shocks, i.e., for hypervelocity cases. To model the interaction of the flow with non-equilibrium chemical effects typical of high-enthalpy flows, the Lighthill-Freeman ideal dissociating gas model is employed. Richtmyer's linear theory and the impulse model are extended to include equilibrium dissociation chemistry. Numerical simulations of the compressible Euler equations indicate no period of linear growth even for amplitude to wavelength ratios as small as one percent. For large Atwood numbers, dissociation causes significant changes in density and temperature, but the change in growth of the perturbations is small. A Mach number scaling for strong shocks is presented which holds for frozen chemistry at high Mach numbers. A local analysis is used to determine the initial baroclinic circulation generation for interfaces corresponding to both positive and negative Atwood ratios