417 citations · 906 across the 6 of their papers we have counts for
6 papers
Constraining the Inflationary Equation of State
Lotty Ackerman, Willy Fischler, Sandipan Kundu +1
We explore possible constraints on the inflationary equation state: p=wρ. While w must be close to -1 for those modes that contribute to the observed power spectrum, for those mode…
Bayesian analysis of an anisotropic universe model: systematics and polarization
Nicolaas E. Groeneboom, Lotty Ackerman, Ingunn Kathrine Wehus +1
We revisit the anisotropic universe model previously developed by Ackerman, Carroll and Wise (ACW), and generalize both the theoretical and computational framework to include polar…
The effect of asymmetric beams in the Wilkinson Microwave Anisotropy Probe experiment
Ingunn Kathrine Wehus, Lotty Ackerman, H. K. Eriksen +1
We generate simulations of the CMB temperature field as observed by the WMAP satellite, taking into account the detailed shape of the asymmetric beams and scanning strategy of the…
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…
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.…
Light Scalars and the Generation of Density Perturbations During Preheating or Inflaton Decay
Lotty Ackerman, Christian W. Bauer, Michael L. Graesser +1
Reheating after inflation can occur through inflaton decay or efficient parametric resonant production of particles from the oscillation of the inflaton. If the particles produced…