113 research outputs found
The Network Composition of Aggregate Unemployment
We develop a theory of unemployment in which workers search for jobs through a network of firms, the labor flow network (LFN). The lack of an edge between two companies indicates the impossibility of labor flows between them due to high frictions. In equilibrium, firms' hiring behavior correlates through the network, modulating labor flows and generating aggregate unemployment. This theory provides new micro-foundations for the aggregate matching function, the Beveridge curve, wage dispersion, and the employer-size premium. Using employer-employee matched records, we study the effect of the LFN topology through a new concept: `firm-specific unemployment'
THERMODYNAMIC PROPERTIES OF --FLUIDS AND THE QUANTUM VACCUM
The thermodynamic behaviour of a relativistic perfect simple fluid obeying
the equation of state , where is a
constant, has been investigated. Particular cases include: vacuum(,
), a randomly oriented distribution of cosmic strings (, ), blackbody radiation (, ) and stiff matter (, ). Fluids with become
hotter when they expand adiabatically (). By assuming
that such fluids may be regarded as a kind of generalized radiation, the
general Planck's type form of the spectrum is deduced. As a limiting case, a
new Lorentz invariant spectrum of the vacuum which is compatible with the
equation of state and other thermodynamic constraints is proposed. Some
possible consequences to the early universe physics are also discussed.Comment: 20 pages, uses LATE
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