60484075
Notes on automatic data handling in United States laboratories visited in September 1966, pt 1
115543079
Bubble chamber picture measurement
59671228
Further notes on the work done using HPD 1
117116734
An assessment of the first bubble chamber experiment processed with the HPD at CERN
107817247
THE HPD MARK 2 FLYING-SPOT DIGITIZER AT CERN.
119275153
Optimizing future experimental probes of inflation
The discovery of many novel realizations of the inflationary universe paradigm has led to a degeneracy problem: many different inflationary Lagrangians generate the same perturbation spectra. Resolving this problem requires the future discovery of additional observables beyond the scalar adiabatic and tensor two-point functions on CMB scales. One important source of degeneracy arises in models where the density perturbation is generated by a noninflationary degree of freedom, for example, through curvatons or modulated reheating. We consider the curvaton scenario as representative of this class, and analyze the degeneracy with single field, canonical inflation that results if the curvaton goes undetected by future observations. We perform Monte Carlo potential reconstructions in the absence of distinguishing observables, such as non-Gaussiantities or isocurvature modes. The resulting degeneracy is considerable and the improved measurements of spectral parameters from future probes like CMBPol offer little to better the situation. Given a degeneracy-breaking observation, the observables must still be inverted to obtain the inflationary potential, with different observations resulting in reconstructions of varying quality. We find that a future detection of isocurvature modes or a precision measurement of the tensor spectral index will enable the most successful reconstructions in the presence of curvatons.
54917997
Tensor tilt from primordial B modes
A primordial cosmic microwave background B mode is widely considered a ‘smoking gun’ signature of an early period of inflationary expansion. However, competing theories of the origin of structure, including string gases (SG) and bouncing cosmologies, also produce primordial tensor perturbations that give rise to a B mode. These models can be differentiated by the scale dependence of their tensor spectra: inflation predicts a red tilt (nT 0), while a non-singular matter bounce gives a zero tilt (nT = 0). We perform a Bayesian analysis to determine how far |nT| must deviate from zero before a tilt can be detected with current and future B-mode experiments. We find that Planck in conjunction with Q/U Imaging Experiment II will decisively detect nT � 0i f |nT| > 0.3, too large to distinguish either single-field inflation or SG from the case nT = 0. While a future mission like CMBPol will offer improvement, only an ideal satellite mission will be capable of providing sufficient Bayesian evidence to distinguish between each model considered.