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Delayed Recombination and Standard Rulers
Francesco De Bernardis, Rachel Bean, Silvia Galli +3
Measurements of Baryonic Acoustic Oscillations in galaxy surveys have been recognized as a powerful tool for constraining dark energy. However, this method relies on the knowledge…
Modeling The Star Forming Universe at z=2: Impact of Cold Accretion Flows
S. Khochfar, J. Silk
We present results of a semi-analytic model (SAM) that includes cold accretion and a porosity-based prescription for star formation. We can recover the puzzling observational resul…
Can the WIMP annihilation boost factor be boosted by the Sommerfeld enhancement?
Massimiliano Lattanzi, Joseph Silk
We demonstrate that the Sommerfeld correction to CDM annihilations can be appreciable if even a small component of the dark matter is extremely cold. Subhalo substructure provides…
Probing the Primordial Power Spectrum with Cluster Number Counts
Teeraparb Chantavat, Christopher Gordon, Joseph Silk
We investigate how well galaxy cluster number counts can constrain the primordial power spectrum. Measurements of the primary anisotropies in the cosmic microwave background (CMB)…
On the Origin of the 511 keV Emission in the Galactic Centre
Reba M. Bandyopadhyay, Joseph Silk, James E. Taylor +1
Diffuse 511 keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30 years. The latest high-resolution…
Formation and evolution of disk galaxies
Joseph Silk
Global star formation is the key to understanding galaxy disk formation. This in turn depends on gravitational instability of disks and continuing gas accretion as well as minor me…