• Publications
  • Influence
The impact on the US economy of changes in wait times at ports of entry
Inspections of people and vehicles at US border crossings are vital to homeland security and preventing unauthorized movement of people and freight into the US interior. However, these inspectionsExpand
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Three Merry Roads to T-violation
TLDR
This paper is a tour of how the laws of nature can distinguish between the past and the future, or be T-violating. Expand
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  • PDF
Economy-wide impacts of reduced wait times at U.S. international airports
Abstract Passport and customs inspections monitor the cross-border flows of people and goods, and are a “bottleneck” in the international transportation system that can cause significant and costlyExpand
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The 9/11 Terrorist Attack and Overseas Travel to the United States: Initial Impacts and Longer-Run Recovery
The United States experienced an immediate and precipitous drop in arrivals of overseas visitors following the terrorist attacks of September 11, 2001. The perception that U.S. visa policy becameExpand
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The Macroeconomic Impacts of the 9/11 Attack: Evidence from Real-Time Forecasting
TLDR
This study evaluates the macroeconomic impacts of the 9/11 attack on U.S. real GDP growth and the unemployment rate by examining how forecasts of these variables were revised after the attack occurred. Expand
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Group Structural Realism
  • B. Roberts
  • Mathematics
  • The British Journal for the Philosophy of Science
  • 1 March 2011
We present a precise form of structural realism, called group structural realism, which identifies ‘structure’ in quantum theory with symmetry groups. However, working out the details of this viewExpand
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Informal Economy and Family Strategies
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Waves in inhomogeneous media.
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Observables, Disassembled
This paper argues that non-self-adjoint operators can be observables. There are only four ways for this to occur: non-self-adjoint observables can either be normal operators, or be symmetric, or haveExpand
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