417 citations · 1.5k across the 23 of their papers we have counts for
7 papers · 1 filter
Instabilities in the Aether
Sean M. Carroll, Timothy R. Dulaney, Moira I. Gresham +1
We investigate the stability of theories in which Lorentz invariance is spontaneously broken by fixed-norm vector "aether" fields. Models with generic kinetic terms are plagued eit…
What if Time Really Exists?
Sean M. Carroll
Despite the obvious utility of the concept, it has often been argued that time does not exist. I take the opposite perspective: let's imagine that time does exist, and the universe…
Dark Matter and Dark Radiation
Lotty Ackerman, Matthew R. Buckley, Sean M. Carroll +1
We explore the feasibility and astrophysical consequences of a new long-range U(1) gauge field ("dark electromagnetism") that couples only to dark matter, not to the Standard Model…
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…
Dark-Matter-Induced Weak Equivalence Principle Violation
Sean M. Carroll, Sonny Mantry, Michael J. Ramsey-Musolf +1
A long-range fifth force coupled to dark matter can induce a coupling to ordinary matter if the dark matter interacts with Standard Model fields. We consider constraints on such a…
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…