Dark Energy and the Nature of the Graviton

Does the existence of dark energy suggest that there is more to the graviton than we think we know?Comment: 4 page

Higgs Boson in RG running Inflationary Cosmology

An intriguing hypothesis is that gravity may be non-perturbatively renormalizable via the notion of asymptotic safety. We show that the Higgs sector of the SM minimally coupled to asymptotically safe gravity can generate the observed near scale-invariant spectrum of the Cosmic Microwave Background through the curvaton mechanism. The resulting primordial power spectrum places an upper bound on the Higgs mass, which for finely tuned values of the curvaton parameters, is compatible with the recently released Large Hadron Collider data.Comment: 7 pages, no figur

Accounting for corporate behavior

Corporate governance ; Financial institutions - Law and legislation

Hydrodynamic Simulations of Galaxy Formation. I. Dissipation and the Maximum Mass of Galaxies

We describe an accurate, one-dimensional, spherically symmetric, Lagrangian hydrodynamics/gravity code, designed to study the effects of radiative cooling and photo-ionization on the formation of protogalaxies. The code can treat an arbitrary number of fluid shells (representing baryons) and collisionless shells (representing cold dark matter). As a test of the code, we reproduce analytic solutions for the pulsation behavior of a polytrope and for the self-similar collapse of a spherically symmetric, cosmological perturbation. In this paper, we concentrate on the effects of radiative cooling, examining the ability of collapsing perturbations to cool within the age of the universe. In contrast to some studies based on order-of- magnitude estimates, we find that cooling arguments alone cannot explain the sharp upper cutoff observed in the galaxy luminosity function.Comment: 33 pages, uuencoded compressed postscript with figures, Ap.J. (in press), corrections to axes in Fig

Book review : Man and machine

Technology ; Labor market

Opinion : How many kinds of unemployment?

Unemployment

Selling Federal Reserve payment services: one price fits all?

Federal Reserve banks ; Payment systems

Tie-in sales and banks

Antitrust law ; Banks and banking

Competition among bank regulators

Banks and banking ; Competition

Opinion : More theory, please

We can question whether the economics profession adequately rewards speaking to the public but that public communication will be most valuable if it reflects recent advances in economic theory and quantitative analysis.Economics - Study and teaching ; Economics