Robust semicoherent searches for continuous gravitational waves with noise and signal models including hours to days long transients

The vulnerability to single-detector instrumental artifacts in standard detection methods for long-duration quasimonochromatic gravitational waves from nonaxisymmetric rotating neutron stars [continuous waves (CWs)] was addressed in past work [D. Keitel et al., Phys. Rev. D 89, 064023 (2014).] by a Bayesian approach. An explicit model of persistent single-detector disturbances led to a generalized detection statistic with improved robustness against such artifacts. Since many strong outliers in semicoherent searches of LIGO data are caused by transient disturbances that last only a few hours, we extend the noise model to cover such limited-duration disturbances, and demonstrate increased robustness in realistic simulated data. Besides long-duration CWs, neutron stars could also emit transient signals which, for a limited time, also follow the CW signal model (tCWs). As a pragmatic alternative to specialized transient searches, we demonstrate how to make standard semicoherent CW searches more sensitive to transient signals. Considering tCWs in a single segment of a semicoherent search, Bayesian model selection yields a new detection statistic that does not add significant computational cost. On simulated data, we find that it increases sensitivity towards tCWs, even of varying durations, while not sacrificing sensitivity to classical CW signals, and still being robust to transient or persistent single-detector instrumental artifacts.Comment: 16 pages, 6 figures, REVTeX4.

The electronification of transit fare payments: a look at the Southeastern Pennsylvania Transportation Authority's New Payment Technologies Project

Over the past decade many of the nation's largest public transit providers have gone from fare-payment systems based on cash and coin to more modern electronic systems that implement payment cards, including agency-issued prepaid cards, credit cards, and debit cards. On September 16, 2008, the Payment Cards Center of the Federal Reserve Bank of Philadelphia hosted a workshop to discuss the challenges and opportunities facing the Southeastern Pennsylvania Transportation Authority (SEPTA) as it attempts to redesign its transit-fare payment system to accept payment cards. Jerry Kane, manager of SEPTA's New Payment Technologies Project, led the workshop. This paper summarizes Kane's presentation and the ensuing discussion. In addition, this paper offers some thoughts on why the modernization of transit-fare payment systems has begun around the country; what obstacles still stand in the way of using credit, debit, and prepaid cards to pay fares; and what this movement means for consumer payments generally.Payment systems ; Credit cards ; Debit cards ; Transportation

The Credit CARD act of 2009 and prepaid cards

Recently enacted federal legislation contains a number of provisions that will affect the prepaid card industry. This note highlights some of these provisions, discusses how they might shape the prepaid card industry, and outlines the debate over whether prepaid cards should be defined as "monetary instruments" under federal law.Payment systems ; Credit cards ; Debit cards ; Law and legislation

Consumer testing informs policy: overdraft regulation as a case study

In November 2009, the Board of Governors of the Federal Reserve System issued regulations that protect consumers from being charged certain fees when, under a discretionary overdraft service, financial institutions pay transactions from a deposit account that contains insufficient funds. Under the regulations, consumers must receive notices that explain any discretionary overdraft services offered to them by their bank. In addition, consumers may not be charged overdraft fees for ATM or one-time debit transactions unless they have opted in to this service. During the rulemaking process, the Board extensively interviewed consumers and tested model notices to understand how consumers think about and use overdraft services. This paper describes banks’ overdraft programs, examines lessons learned from consumer testing, and explains how information obtained during consumer testing influenced the rulemaking. In addition, this paper presents some insights about more effective ways of conveying key information about overdraft services to consumers.Consumers' preferences ; Overdrafts ; Regulation

Legislative responses to data breaches and information security failures

On July 23, 2008, the Payment Cards Center of the Federal Reserve Bank of Philadelphia hosted a workshop to discuss federal and state legislative responses to data breaches. The workshop addressed several laws and legislative initiatives designed to create greater safeguards for personal consumer information frequently targeted by data thieves and often subject to the failures of information security protocols. Diane Slifer, J.D., M.B.A., who has frequently presented at forums on data security and has represented clients in matters related to data breaches, led the workshop. Slifer examined several highly publicized data breaches and explained how various laws and regulations have been put in place in order to protect and inform consumers whose personal information has been compromised. Additionally, she discussed several legislative initiatives designed to potentially create a more structured and secure environment for private consumer data overall. This paper summarizes Slifer's presentation, the ensuing discussion, and additional Payment Cards Center research. In addition, it offers a brief overview of recent data breaches, a description of various ways that federal and state laws operate, and some thoughts on how effective these laws and regulations have been.Payment systems ; Identity theft ; Fraud ; Law and legislation

The electronification of transit fare payments: Examining the case for partnership the case for partnerships between payments firms and transit agencies

Several of the nation’s largest payment-card-issuing banks are working with public transit agencies to enable consumers to pay fares by using payment cards, and more such partnerships may be on the horizon. On April 23, 2009, the Payment Cards Center of the Federal Reserve Bank of Philadelphia hosted a workshop to discuss the potential adoption of electronic payments by transit agencies from the perspectives of several subject matter experts from J.P. Morgan Chase & Co. James Lock, vice president and senior advisor, Treasury Services Global Advisory Solutions group; Jameson Troutman, strategy manager with Chase Card Services; and Krista Gallagher, from Chase’s retail banking team, attended the workshop. This paper looks at several electronic transit-fare payment models and the potential opportunities these models present to transit agencies and payments firms — such as the opportunity for transit agencies to reduce costs and to operate a more efficient payments infrastructure or the opportunity for the payments industry to increase consumers’ use of contactless payment technology. This paper also identifies significant obstacles to widespread adoption of systems that allow consumers to use their credit, debit, or prepaid cards to pay fares directly.Local transit ; Point-of-sale-systems ; Public-private sector cooperation

Conference summary: federal regulation of the prepaid card industry: costs, benefits, and changing industry dynamics

On April 8-9, 2010, the Payment Cards Center of the Federal Reserve Bank of Philadelphia hosted a conference that brought together leaders in the prepaid card industry, regulators, consumer groups, law enforcement agents, and industry researchers to discuss the economics of prepaid cards and the benefits and costs of their regulation from the standpoint of several different product categories. In particular, the conference examined ways in which prepaid card products can differ, how the industry has developed over time, ongoing industry dynamics, ways in which the usefulness of prepaid products to criminals might be limited, whether consumers who use prepaid cards are adequately protected, and the challenges facing regulators. This paper summarizes the highlights from the presentations given at the conference and the discussions that ensued.Point-of-sale-systems ; Consumer credit

The laws, regulations, guidelines, and industry practices that protect consumers who use gift cards

This paper discusses consumer protections available to gift-card users. Specifically, it examines the ways in which value loaded at the time of purchase is protected for future card use or returned to consumers when the card is not used or has expired. The consumer protection information included in this paper is derived from a number of sources, including several types of state statutes, Federal Trade Commission decisions, financial industry regulatory agency guidelines, and previous interviews with payments industry experts regarding practices concerning network-branded gift cards. This paper expands research begun by the Payment Cards Center in 2004 into prepaid cards generally and the protections available to consumers who use gift cards specifically.Payment systems

Line-robust statistics for continuous gravitational waves: safety in the case of unequal detector sensitivities

The multi-detector F-statistic is close to optimal for detecting continuous gravitational waves (CWs) in Gaussian noise. However, it is susceptible to false alarms from instrumental artefacts, for example quasi-monochromatic disturbances ('lines'), which resemble a CW signal more than Gaussian noise. In a recent paper [Keitel et al 2014, PRD 89 064023], a Bayesian model selection approach was used to derive line-robust detection statistics for CW signals, generalising both the F-statistic and the F-statistic consistency veto technique and yielding improved performance in line-affected data. Here we investigate a generalisation of the assumptions made in that paper: if a CW analysis uses data from two or more detectors with very different sensitivities, the line-robust statistics could be less effective. We investigate the boundaries within which they are still safe to use, in comparison with the F-statistic. Tests using synthetic draws show that the optimally-tuned version of the original line-robust statistic remains safe in most cases of practical interest. We also explore a simple idea on further improving the detection power and safety of these statistics, which we however find to be of limited practical use.Comment: 21 pages, 11 figures, updated to match published versio