The M Word: The Rise and Fall of Interracial Coalitions On Fathers And Welfare Reform

Buoyed by the success of the 1996 Personal Responsibility and Work Opportunities Reconciliation Act (PRWORA), whose time limits and work requirements played a large role in the reduction of the welfare rolls, conservative advocates of welfare reform are now moving to ensure that our welfare system reflects traditional family values as well. Responding to this sentiment, the Bush Administration is encouraging states to use TANF to support marriage promotion efforts and the Administration's 2002 budget includes $100 million in support of demonstration projects to promote marriage (source). By contrast, the$60 million President Bush had committed to support efforts to promote responsible fatherhood, not restricted to marriage, has been pared back to $20 million, along with cutbacks in other domestic initiatives that are needed to pay for the "war against terrorism."

Just Get Me to the Church: Assessing Policies to Promote Marriage among Fragile Families

This article examines alternative approaches to encourage family formation among fragile families, including higher cash benefits, more liberal acceptance of welfare applications, more effective child support enforcement, and efforts to increase education and employment of low-income parents. We examine these approaches by refining and expanding previous work on a generalized logit model of the mothers’ actual family formation outcomes, in a hierarchy that includes father absence, father involvement, cohabitation, and marriage. Refinements involve measurements of family formation that make our results more comparable to other studies and new controls for previous fertility with the father of the focal child and with another partner (multiple partner fertility). We estimate these models using interim data from the Fragile Families and Child Well-Being 12 month follow-up Survey. The results indicate that, unlike their effects on mature families, cash benefits increase the odds of family formation (short of marriage) among fragile families and effective child support enforcement increases the odds of marriage. However, the father’s employment status outweighs the effects of these traditional income security policies on family formation, because it affects outcomes all along the hierarchy, including marriage, and its effects are larger. Unlike previous research, our data on previous fertility enables us to separate the effects of previous children in common from multiple partner fertility on family formation. Both significantly affect family formation (though in opposite directions), but even after including these variables, blacks, who are more likely to bring children from previous unions into a new union, have substantially lower odds of cohabitation and marriage than non-Hispanic whites.

Fermi liquid theory of ultra-cold trapped Fermi gases: Implications for Pseudogap Physics and Other Strongly Correlated Phases

We show how Fermi liquid theory can be applied to ultra-cold Fermi gases, thereby expanding their "simulation" capabilities to a class of problems of interest to multiple physics sub-disciplines. We introduce procedures for measuring and calculating position dependent Landau parameters. This lays the ground work for addressing important controversial issues: (i) the suggestion that thermodynamically, the normal state of a unitary gas is indistinguishable from a Fermi liquid (ii) that a fermionic system with strong repulsive contact interactions is associated with either ferromagnetism or localization; this relates as well to $^3$He and its p-wave superfluidity.Comment: 4 pages, 2 figures, revised versio

Light-Enhanced Spin Fluctuations and d-Wave Superconductivity at a Phase Boundary

Time-domain techniques have shown the potential of photo-manipulating existing orders and inducing new states of matter in strongly correlated materials. Using time-resolved exact diagonalization, we perform numerical studies of pump dynamics in a Mott-Peierls system with competing charge and spin density waves. A light-enhanced $d$-wave superconductivity is observed when the system resides near a quantum phase boundary. By examining the evolution of spin, charge and superconducting susceptibilities, we show that a sub-dominant state in equilibrium can be stabilized by photomanipulating charge order to allow superconductivity to appear and dominate. This work provides an interpretation of light-induced superconductivity from the perspective of order competition, and offers a promising approach for designing novel emergent states out of equilibrium.Comment: 5 pages, 4 figure

Inflaton two-point correlation in the presence of a cosmic string

Precise measurements of the microwave background anisotropy have confirmed the inflationary picture of approximately scale invariant, Gaussian primordial adiabatic density perturbations. However, there are some anomalies that suggest a small violation of rotational and/or translational invariance in the mechanism that generates the primordial density fluctuations. Motivated by this we study the two-point correlation of a massless scalar (the inflaton) when the stress tensor contains the energy density from an infinitely long straight cosmic string in addition to a cosmological constant

A Novel Side-Channel in Real-Time Schedulers

We demonstrate the presence of a novel scheduler side-channel in preemptive, fixed-priority real-time systems (RTS); examples of such systems can be found in automotive systems, avionic systems, power plants and industrial control systems among others. This side-channel can leak important timing information such as the future arrival times of real-time tasks.This information can then be used to launch devastating attacks, two of which are demonstrated here (on real hardware platforms). Note that it is not easy to capture this timing information due to runtime variations in the schedules, the presence of multiple other tasks in the system and the typical constraints (e.g., deadlines) in the design of RTS. Our ScheduLeak algorithms demonstrate how to effectively exploit this side-channel. A complete implementation is presented on real operating systems (in Real-time Linux and FreeRTOS). Timing information leaked by ScheduLeak can significantly aid other, more advanced, attacks in better accomplishing their goals

Topological quantization of energy transport in micro- and nano-mechanical lattices

Topological effects typically discussed in the context of quantum physics are emerging as one of the central paradigms of physics. Here, we demonstrate the role of topology in energy transport through dimerized micro- and nano-mechanical lattices in the classical regime, i.e., essentially "masses and springs". We show that the thermal conductance factorizes into topological and non-topological components. The former takes on three discrete values and arises due to the appearance of edge modes that prevent good contact between the heat reservoirs and the bulk, giving a length-independent reduction of the conductance. In essence, energy input at the boundary mostly stays there, an effect robust against disorder and nonlinearity. These results bridge two seemingly disconnected disciplines of physics, namely topology and thermal transport, and suggest ways to engineer thermal contacts, opening a direction to explore the ramifications of topological properties on nanoscale technology.Comment: 6 pages, 3 figures; Supplemental information included as an ancillary fil