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Translational Invariance and the Anisotropy of the Cosmic Microwave Background
Sean M. Carroll, Chien-Yao Tseng, Mark B. Wise
Primordial quantum fluctuations produced by inflation are conventionally assumed to be statistically homogeneous, a consequence of translational invariance. In this paper we quanti…
Superhorizon Perturbations and the Cosmic Microwave Background
Adrienne L. Erickcek, Sean M. Carroll, Marc Kamionkowski
Superhorizon perturbations induce large-scale temperature anisotropies in the cosmic microwave background (CMB) via the Grishchuk-Zel'dovich effect. We analyze the CMB temperature…
A Hemispherical Power Asymmetry from Inflation
Adrienne L. Erickcek, Marc Kamionkowski, Sean M. Carroll
Measurements of CMB temperature fluctuations by the Wilkinson Microwave Anisotropy Probe (WMAP) indicate that the fluctuation amplitude in one half of the sky differs from the ampl…
Imprints of a Primordial Preferred Direction on the Microwave Background
Lotty Ackerman, Sean M. Carroll, Mark B. Wise
Rotational invariance is a well-established feature of low-energy physics. Violations of this symmetry must be extremely small today, but could have been larger in earlier epochs.…
Modified-Source Gravity and Cosmological Structure Formation
Sean M. Carroll, Ignacy Sawicki, Alessandra Silvestri +1
One way to account for the acceleration of the universe is to modify general relativity, rather than introducing dark energy. Typically, such modifications introduce new degrees of…
Cosmological Structure Evolution and CMB Anisotropies in DGP Braneworlds
Ignacy Sawicki, Sean M. Carroll
The braneworld model of Dvali, Gabadadze and Porrati (DGP) provides an intriguing modification of gravity at large distances and late times. By embedding a three-brane in an uncomp…