26,140 research outputs found
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
Selling Federal Reserve payment services: one price fits all?
Federal Reserve banks ; Payment systems
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
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