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13 papers · 2 filters
A generalized local ansatz and its effect on halo bias
Sarah Shandera, Neal Dalal, Dragan Huterer
Motivated by the properties of early universe scenarios that produce observationally large local non-Gaussianity, we perform N-body simulations with non-Gaussian initial conditions…
Nongaussianity from Particle Production During Inflation
Neil Barnaby
In a variety of models the motion of the inflaton may trigger the production of some non-inflaton particles during inflation, for example via parametric resonance or a phase transi…
Improved Dark Energy Detection through the Polarization-assisted WMAP-NVSS ISW Correlation
Guo-Chin Liu, Kin-Wang Ng, Ue-Li Pen
Integrated Sachs-Wolfe (ISW) effect can be estimated by cross-correlating Cosmic Microwave Background (CMB) sky with tracers of the local matter distribution. At late cosmic time,…
Large-scale BAO signatures of the smallest galaxies
Neal Dalal, Ue-Li Pen, Uros Seljak
Recent work has shown that at high redshift, the relative velocity between dark matter and baryonic gas is typically supersonic. This relative velocity suppresses the formation of…
Increasing the Fisher Information Content in the Matter Power Spectrum by Non-linear Wavelet Weiner Filtering
Tong-Jie Zhang, Hao-Ran Yu, Joachim Harnois-Déraps +2
We develop a purely mathematical tool to recover some of the information lost in the non-linear collapse of large-scale structure. From a set of 141 simulations of dark matter dens…
Results from the Supernova Photometric Classification Challenge
Richard Kessler, Bruce Bassett, Pavel Belov +24
We report results from the Supernova Photometric Classification Challenge (SNPCC), a publicly released mix of simulated supernovae (SNe), with types (Ia, Ibc, and II) selected in p…