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Phase transitions can be modeled by the motion of an interface between two locally stable phases. A modified Kuramoto-Sivashinsky equation, h, + 72h + Wh = (1-a)lVhl ~ ± X(V~h): + ~A(hx~hyy-h~y), describes near planar interfaces which are marginally long-wave unstable. We study the question of finite-time singularity formation in this equation in one and… (More)

- Andrew J. Bernoff, Chad M. Topaz
- SIAM J. Applied Dynamical Systems
- 2011

We study equilibrium configurations of swarming biological organisms subject to exogenous and pairwise endogenous forces. Beginning with a discrete dynamical model, we derive a variational description of the corresponding continuum population density. Equilibrium solutions are extrema of an energy functional and satisfy a Fredholm integral equation. We find… (More)

- Thomas P. Witelski, Andrew J. Bernoff, +4 authors A. L. BERTOZZI
- 2003

We study the dynamics of dissipation and blow-up in a critical-case unstable thin film equation. The governing equation is a nonlinear fourth-order degenerate parabolic PDE derived from a generalized model for lubrication flows of thin viscous fluid layers on solid surfaces. There is a critical mass for blow-up and a rich set of dynamics including families… (More)

- Andrew J. Leverentz, Chad M. Topaz, Andrew J. Bernoff
- SIAM J. Applied Dynamical Systems
- 2009

We classify and predict the asymptotic dynamics of a class of swarming models. The model consists of a conservation equation in one dimension describing the movement of a population density field. The velocity is found by convolving the density with a kernel describing attractive-repulsive social interactions. The kernel's first moment and its limiting… (More)

- Andrew J. Bernoff, Thomas P. Witelski
- Appl. Math. Lett.
- 2002

Stability of self-similar solutions for van der Waals driven thin film rupture.

- Chad M. Topaz, Maria R. D'Orsogna, Leah Edelstein-Keshet, Andrew J. Bernoff
- PLoS Computational Biology
- 2012

Locusts exhibit two interconvertible behavioral phases, solitarious and gregarious. While solitarious individuals are repelled from other locusts, gregarious insects are attracted to conspecifics and can form large aggregations such as marching hopper bands. Numerous biological experiments at the individual level have shown how crowding biases conversion… (More)

We construct an individual-based kinematic model of rolling migratory locust swarms. The model incorporates social interactions, gravity, wind, and the effect of the impenetrable boundary formed by the ground. We study the model using numerical simulations and tools from statistical mechanics, namely the notion of H-stability. For a free-space swarm (no… (More)

- S Setayeshgar, Andrew J Bernoff
- Physical review letters
- 2002

We consider the dynamics of scroll waves in the presence of rotating anisotropy, a model of the left ventricle of the heart in which the orientation of fibers in successive layers of tissue rotates. By choosing a coordinate system aligned with the fiber rotation and studying the phase dynamics of a straight but twisted scroll wave, we derive a Burgers'… (More)

- Christa Nilsen, John Paige, +5 authors Chad M. Topaz
- PloS one
- 2013

From bird flocks to fish schools and ungulate herds to insect swarms, social biological aggregations are found across the natural world. An ongoing challenge in the mathematical modeling of aggregations is to strengthen the connection between models and biological data by quantifying the rules that individuals follow. We model aggregation of the pea aphid,… (More)