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Using Perturbative Least Action to Recover Cosmological Initial Conditions
David M. Goldberg, David N. Spergel
We introduce a new method for generating initial conditions consistent with highly nonlinear observations of density and velocity fields. Using a variant of the Least Action method…
The Power Spectrum of the Sunyaev-Zel'dovich Effect
A. Refregier, E. Komatsu, D. N. Spergel +1
(Abridged) The hot gas in the IGM produces anisotropies in the Cosmic Microwave Background (CMB) through the thermal Sunyaev-Zel'dovich (SZ) effect. The SZ effect is a powerful pro…
Domain Wall Dominated Universes
Richard A. Battye, Martin Bucher, David Spergel
We consider a cosmogony with a dark matter component consisting of a network of frustrated domain walls. Such a network provides a solid dark matter component with that…
Observational evidence for self-interacting cold dark matter
David N. Spergel, Paul J. Steinhardt
Cosmological models with cold dark matter composed of weakly interacting particles predict overly dense cores in the centers of galaxies and clusters and an overly large number of…
Cosmic Microwave Background Observations in the Post-Planck Era
J. B. Peterson, J. E. Carlstrom, E. S. Cheng +5
The Microwave Anisotropy Probe and Planck missions will provide low noise maps of the temperature of the cosmic microwave background (CMB). These maps will allow measurement of the…
Evolution of the Galactic Potential and Halo Streamers with Future Astrometric Satellites
HongSheng Zhao, Kathryn Johnston, Lars Hernquist +1
ESA's Global Astrometric Interferometer for Astrophysics (GAIA) holds the promise of mapping out the detailed phase space structure of the Galactic halo by providing unprecedented…
A small universe after all?
Neil J. Cornish, David N. Spergel
The cosmic microwave background radiation allows us to measure both the geometry and topology of the universe. It has been argued that the COBE-DMR data already rule out models tha…
Absorption Line Signatures of Gas in Mini Dark Matter Halos
Jeremy Kepner, Todd Tripp, Tom Abel +1
Recent observations and theoretical calculations suggest that some QSO absorption line systems may be due to gas in small dark matter halos with circular velocities on the order of…
High Velocity Clouds: the Missing Link
Leo Blitz, David N. Spergel, Peter J. Teuben +1
Hierarchical structure formation models predict the existence of large numbers of low velocity dispersion dark halos. Galaxy surveys find far fewer galaxies than predicted by analy…
Studying Evolution of the Galactic Potential and Halo Streamers with Future Astrometric Satellites
HongSheng Zhao, Kathryn Johnston, David Spergel +1
Future astrometric satellites, such as SIM (NASA's Space Interferometric Mission) and GAIA (ESA's Global Astrometric Interferometer for Astrophysics), hold the promise of mapping o…