Primordial Perturbations from Multifield Inflation with Nonminimal Couplings

Realistic models of particle physics include many scalar fields. These fields generically have nonminimal couplings to the Ricci curvature scalar, either as part of a generalized Einstein theory or as necessary counterterms for renormalization in curved background spacetimes. We develop a gauge-invariant formalism for calculating primordial perturbations in models with multiple nonminimally coupled fields. We work in the Jordan frame (in which the nonminimal couplings remain explicit) and identify two distinct sources of entropy perturbations for such models. One set of entropy perturbations arises from interactions among the multiple fields. The second set arises from the presence of nonminimal couplings. Neither of these varieties of entropy perturbations will necessarily be suppressed in the long-wavelength limit, and hence they can amplify the curvature perturbation, $\zeta$, even for modes that have crossed outside the Hubble radius. Models that overproduce long-wavelength entropy perturbations endanger the close fit between predicted inflationary spectra and empirical observations.Comment: 16 pages, no figures. References added to match published versio

Observations of extremely thin clouds in the tropical tropopause region by a ship based lidar.

During the cruises ANT XVII/4 (Punta Arenas Bremerhaven, 2000) and ANT XX1/1 (Bremerhaven - Cape Town, 2003) continuous measurements of clouds and aerosol have been performed by a Mobile Aerosol Raman Lidar (MARL). This system measures backscatter of light at 355 nm and 532 nm and is able to detect even extremely thin layers of particles in the atmosphere. Cloud base and top height, depolarisation optical depth and color index can be deduced from this data. During the Polarstern cruises very thin layers of ice particles have been observed frequently in the tropical tropopause layer (TTL). Cases of persistent cloud layers with an optical depth below 10^-3 are reported. Based on the data of radiosondes which were launched daily aboard the vessel, the conditions at which these type of clouds form are analysed. It is shown, that these clouds form in a layer below the cold point, but above the lapse rate tropopause. The relation between cloud occurrence and temperature and wind in the TTL as well as state of the QBO are discussed

Conformal Transformations with Multiple Scalar Fields

Many interesting models incorporate scalar fields with non-minimal couplings to the spacetime Ricci curvature scalar. As is well known, if only one scalar field is non-minimally coupled, then one may perform a conformal transformation to a new frame in which both the gravitational portion of the Lagrangian and the kinetic term for the (rescaled) scalar field assume canonical form. We examine under what conditions the gravitational and kinetic terms in the Lagrangian may be brought into canonical form when more than one scalar field has non-minimal coupling. A particular class of two-field models admits such a transformation, but models with more than two non-minimally coupled fields in general do not.Comment: 17 pages, no figures. References added to match published version

Multifield Inflation after Planck: Isocurvature Modes from Nonminimal Couplings

Recent measurements by the {\it Planck} experiment of the power spectrum of temperature anisotropies in the cosmic microwave background radiation (CMB) reveal a deficit of power in low multipoles compared to the predictions from best-fit $\Lambda$CDM cosmology. The low-$\ell$ anomaly may be explained by the presence of primordial isocurvature perturbations in addition to the usual adiabatic spectrum, and hence may provide the first robust evidence that early-universe inflation involved more than one scalar field. In this paper we explore the production of isocurvature perturbations in nonminimally coupled two-field inflation. We find that this class of models readily produces enough power in the isocurvature modes to account for the \emph{Planck} low-$\ell$ anomaly, while also providing excellent agreement with the other {\it Planck} results.Comment: 19 pages, 15 figures. Minor edits to match published versio

Testing Bell's Inequality with Cosmic Photons: Closing the Setting-Independence Loophole

We propose a practical scheme to use photons from causally disconnected cosmic sources to set the detectors in an experimental test of Bell's inequality. In current experiments, with settings determined by quantum random number generators, only a small amount of correlation between detector settings and local hidden variables, established less than a millisecond before each experiment, would suffice to mimic the predictions of quantum mechanics. By setting the detectors using pairs of quasars or patches of the cosmic microwave background, observed violations of Bell's inequality would require any such coordination to have existed for billions of years --- an improvement of 20 orders of magnitude.Comment: 5 pages, 4 figures. Minor edits to closely match journal version to be published in Physical Review Letter

The fractional chromatic number of triangle-free subcubic graphs

Heckman and Thomas conjectured that the fractional chromatic number of any triangle-free subcubic graph is at most 14/5. Improving on estimates of Hatami and Zhu and of Lu and Peng, we prove that the fractional chromatic number of any triangle-free subcubic graph is at most 32/11 (which is roughly 2.909)

Economic Globalization and the Welfare State in Affluent Democracies, 1975-1998

Prior scholarship is sharply divided on how or if globalization influences welfare states. Globalization's effects may be positive causing expansion, negative triggering crisis and reduction, curvilinear contributing to convergence, or insignificant. We bring new evidence to bear on this crucial debate with a pooled time series analysis of two measures of the welfare state and 16 indicators of economic globalization for 17 affluent democracies from 1975 to 1998. The analysis suggests that: (1) state-of-the-art welfare state models warrant revision in the globalization era; (2) most indicators of economic globalization do not have significant effects; (3) the few significant globalization effects are in different directions and often inconsistent with extant theories; (4) the globalization effects are far smaller than the effects of domestic political and economic factors; and (5) these effects are not systematically different for liberal vs. nonliberal welfare state regimes, European vs. non-European countries, or with four alternative dependent variables. Increased globalization and a modest convergence of the welfare state have occurred, but globalization does not unambiguously cause welfare state expansion, crisis and reduction or convergence. -- Bisherige Befunde der sozialwissenschaftlichen Forschung zum kausalen Verhältnis von 'Globalisierung' und Wohlfahrtsstaat sind nicht eindeutig. Danach kann Globalisierung positive Effekte haben und zu einem Ausbau an Wohlfahrtsstaatlichkeit führen, eine Krise des Wohlfahrtsstaates oder Leistungsreduktionen herbeiführen, kurvilineare Wirkungen aufweisen und zu Konvergenz beitragen, als auch vollkommen insignifikant sein. Unsere gepoolte Zeitreihenanalyse von Wohlfahrtsstaatlichkeit und 'Globalisierung' in 17 reichen Demokratien (1975-1998) hat folgende Befunde zu Tage gefördert: (1) im Zeitalter der Globalisierung erscheinen bestehende Wohlfahrtsstaatsmodelle revisionsbedürftig; (2) die Mehrzahl der ökonomischen Globalisierungsindikatoren weist keine signifikanten Effekte auf; (3) die wenigen signifikanten Effekte zeigen in unterschiedliche Richtungen und stimmen häufig nicht mit bestehenden theoretischen Annahmen überein; (4) die Globalisierungseffekte sind deutlich kleiner als die Effekte binnenpolitischer Variablen und ökonomischer Faktoren; (5) diese Effekte unterscheiden sich in 'liberalen' und 'nicht-liberalen' Wohlfahrtsregimen bzw. europäischen und nicht-europäischen Ländern nicht systematisch von einander. Im Analysezeitraum können wir sowohl einen Anstieg der verschiedenen Globalisierungsindikatoren sowie eine moderate Konvergenz der verschiedenen Wohlfahrtsstaaten konstatieren. Jedoch kann der Prozess der 'Globalisierung' nicht eindeutig als kausale Ursache für die unterschiedlichen Entwicklungsrichtungen in den verschiedenen Wohlfahrtsstaaten identifiziert werden.

CONSUMER PERCEPTIONS AND ATTITUDES TOWARDS BOVINE SOMATOTROPIN

This article investigates the possible negative effects of bovine somatotropin (bST) and antibiotic use in cows on fluid-milk consumption in New York State. Based on data from a consumer survey, the potential change in milk consumption due to bST and antibiotic use is estimated. In addition, the current perceptions of consumers about bST and antibiotics are measured, and the significant socioeconomic, demographic, and attitudinal characteristics of consumers that are related to their milk-consumption response to bST are identified. Depending upon consumer awareness of bST, the results indicate that milk consumption in New York State could decrease by 5.5% to 15.6% if bST is approved. The results also suggest that antibiotic use in cows could decrease milk consumption by 1.6% to 7%, depending upon consumer awareness. A major implication is that education will likely play an important role in influencing consumers' attitudes and perceptions about both bST and antibiotics.Consumer/Household Economics, Livestock Production/Industries,