Directed energy

Directed fixed energy sandpile model.

We numerically study the directed version of the fixed energy sandpile. On a closed square lattice, the dynamical evolution of a fixed density of sand grains is studied. The activity of the system shows a continuous phase transition around a critical density. While the deterministic version has the set of nontrivial exponents, the stochastic model is characterized by mean field like exponents.

Directed Energy for Planetary Defense

Directed energy in the form of photons plays an increasingly important role in everyday life, in areas ranging from communications to industrial machining. Recent advances in laser photonics now allow very large-scale modular and scalable systems that are suitable for planetary defense. The fundamental requirements of directed energy planetary defense systems are described here, along with the ...

70 Directed Energy Technology , Modeling , and Assessment

Implications of Directed Energy for SETI

We compute the detectability of directed energy sources from distant civilizations that may exist. Recent advances in our own directed energy abilities allow us to foresee our own capability that will radically change our ability to broadcast our presence and hence allow us to ponder the reverse case of detection. In the next few decades we will evolve to the point where we will be able to prod...

Energy Efficiency and Directed Technical Change

I construct a putty-clay model of directed technical change and use it to analyze the effect of environmental policy on energy use in the United States. The model matches key data patterns that cannot be explained by the standard Cobb-Douglas approach used in climate change economics. In particular, the model captures both the shortand long-run elasticity of substitution between energy and non-...