237 citations · 331 across the 11 of their papers we have counts for
11 papers
Self-similarity in pandemic spread and fractal containment policies
Alexander F. Siegenfeld, Asier Piñeiro Orioli, Robin Na +2
Although pandemics are often studied as if populations are well-mixed, disease transmission networks exhibit a multi-scale structure stretching from the individual all the way up t…
Quantitative errors in the Cochrane review on "Physical interventions to interrupt or reduce the spread of respiratory viruses"
Yaneer Bar-Yam, Jonathan M. Samet, Alexander F. Siegenfeld +1
The COVID-19 pandemic has heightened the urgency to understand and prevent pathogen transmission, specifically regarding infectious airborne particles. Extensive studies validate t…
How Democracies Polarize: A Multilevel Perspective
Sihao Huang, Alexander F. Siegenfeld, Andrew Gelman
Democracies employ elections at various scales to select officials at the corresponding levels of administration. The geographical distribution of political opinion, the policy iss…
A Formal Definition of Scale-dependent Complexity and the Multi-scale Law of Requisite Variety
Alexander F. Siegenfeld, Yaneer Bar-Yam
Ashby's law of requisite variety allows a comparison of systems with their environments, providing a necessary (but not sufficient) condition for system efficacy: a system must pos…
Modeling complex systems: A case study of compartmental models in epidemiology
Alexander F. Siegenfeld, Pratyush K. Kollepara, Yaneer Bar-Yam
Compartmental epidemic models have been widely used for predicting the course of epidemics, from estimating the basic reproduction number to guiding intervention policies. Studies…
Unmasking the mask studies: why the effectiveness of surgical masks in preventing respiratory infections has been underestimated
Pratyush K. Kollepara, Alexander F. Siegenfeld, Nassim Nicholas Taleb +1
Face masks have been widely used as a protective measure against COVID-19. However, pre-pandemic empirical studies have produced mixed statistical results on the effectiveness of m…
Comment on: A systematic review and meta-analysis of published research data on COVID-19 infection-fatality rates
Chen Shen, Derrick Van Gennep, Alexander F. Siegenfeld +1
The infection fatality rate (IFR) of COVID-19 is one of the measures of disease impact that can be of importance for policy making. Here we show that many of the studies on which t…
Eliminating COVID-19: The Impact of Travel and Timing
Alexander F. Siegenfeld, Yaneer Bar-Yam
We analyze the spread of COVID-19 by considering the transmission of the disease among individuals both within and between regions. A set of regions can be defined as any partition…
An Introduction to Complex Systems Science and its Applications
Alexander F. Siegenfeld, Yaneer Bar-Yam
The standard assumptions that underlie many conceptual and quantitative frameworks do not hold for many complex physical, biological, and social systems. Complex systems science cl…
Negative Representation and Instability in Democratic Elections
Alexander Siegenfeld, Yaneer Bar-Yam
The challenge of understanding the collective behaviors of social systems can benefit from methods and concepts from physics [1-6], not because humans are similar to electrons, but…
Inverse Melting of an Electronic Liquid Crystal
Shu-Han Lee, Yen-Chung Lai, Chao-Hung Du +6
Inverse melting refers to the rare thermodynamic phenomenon in which a solid melts into a liquid upon cooling, a transition that can occur only when the ordered (solid) phase has m…