J. Richard Bond

The Canada-UK Deep Submillimeter Survey: first submillimeter images, the source counts, and resolution of the background

We present the first results of a deep unbiased submillimeter survey carried out at 450 and 850 μm. We detected 12 sources at 850 μm at greater than the 3 σ level, giving a surface density of sources with S850μm>2.8 mJy of 0.49 ± 0.16 arcmin-2. If replicated over the sky, our sources would generate a background at 850 μm of 9.6 × 10−11 W m-2 sr-1, which is simeq20% of the value measured by the Far-Infrared Absolute Spectrophotometer (FIRAS) and a significant fraction of the total background radiation produced by stars. This implies, through the connection between metallicity and background radiation, that a significant fraction of all the stars that have ever been formed were formed in objects like those detected here. The combination of their large contribution to the background radiation and their extreme bolometric luminosities makes these objects excellent candidates for being proto-elliptical galaxies. Optical astronomers have recently shown that the UV luminosity density of the universe increases by a factor of simeq10 between z=0 and z=1-2 and then decreases again at higher redshifts. Using the results of a parallel submillimeter survey of the local universe, we show that both the submillimeter source density and background radiation (as detected by FIRAS) can be explained if the submillimeter luminosity density evolves in a similar way to the UV luminosity density. Thus, if these sources are elliptical galaxies in the process of formation, they are probably forming at relatively modest redshifts.

Natural inflation: Particle physics models, power-law spectra for large-scale structure, and constraints from the Cosmic Background Explorer.

We discuss the particle physics basis for models of natural inflation with pseudo Nambu-Goldstone bosons and study the consequences for large-scale structure of the nonscale-invariant density fluctuation spectra that arise in natural inflation and other models. A pseudo Nambu-Goldstone boson, with a potential of the form

The Canada-United Kingdom Deep Submillimeter Survey. II. First Identifications, Redshifts, and Implications for Galaxy Evolution*

V(\ensuremath{\varphi})={\ensuremath{\Lambda}}^{4}[1\ifmmode\pm\else\textpm\fi{}cos(\frac{\ensuremath{\varphi}}{f})]

Detection of the power spectrum of cosmic microwave background lensing by the Atacama Cosmology Telescope.

, can naturally give rise to an epoch of inflation in the early Universe, if

Halo Assembly Bias in Hierarchical Structure Formation

f\ensuremath{\sim}{M}_{\mathrm{Pl}}

Evidence for dark energy from the cosmic microwave background alone using the Atacama Cosmology Telescope lensing measurements.

and

FAST COSMIC MICROWAVE BACKGROUND ANALYSES VIA CORRELATION FUNCTIONS

\ensuremath{\Lambda}\ensuremath{\sim}{M}_{\mathrm{GUT}}

Signal-to-noise eigenmode analysis of the two year COBE maps

. Such mass scales arise in particle physics models with a gauge group that becomes strongly interacting at the grand unified theory scale. We work out a specific particle physics example based on the multiple gaugino condensation scenario in superstring theory. We then study the cosmological evolution of and constraints upon these inflation models numerically and analytically. To obtain sufficient inflation with a probability of order 1 and a high enough post-inflation reheat temperature for baryogenesis, we require

Canadian Hydrogen Intensity Mapping Experiment (CHIME) pathfinder

f\ensuremath{\gtrsim}0.3{M}_{\mathrm{Pl}}

Non-Gaussian curvature spikes from chaotic billiards in inflation preheating.

. The primordial density fluctuation spectrum generated by quantum fluctuations in