## You are here

# Rachel E. Bean

Associate Professor

## Overview

Professor Bean's work focuses on cosmological theories and how they can constrained using observations such as the cosmic microwave background (CMB) and large scale structure data (galaxies and clusters of galaxies). Her current research includes work to establish the nature of dark energy, the mysterious quantity responsible for the accelerated expansion of the universe, and dark matter, and how can observations can be used to distinguish between competing theories. She is also interested in the application of string theory to understanding how initial conditions for seeding structure were established in the early universe.

### Research Focus

My research , and that of the students working with me, focuses on cosmological theories and how we can constrain them using observations such as the cosmic microwave background "CMB" (radiation emitted at the earliest, directly-observable time in the universe's history), and large scale structure data (galaxies and clusters of galaxies).

My current research includes work to establish the nature of dark energy, the mysterious quantity responsible for the accelerated expansion of the universe, and dark matter, and how can we use observations to distinguish between competing theories. I'm also interested in the application of string theory to understanding how initial conditions for seeding structure are established in the early universe.

### Departments/Programs

- Astronomy

### Graduate Fields

- Astronomy and Space Sciences
- Physics

## Publications

- R. Bean, X. Chen, H. V. Peiris and J. Xu, "Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations", Phys. Rev. D. 77 (2008) 023527, arXiv:0710.1812 (hep-th)

- I. Laszlo and R. Bean, "Nonlinear growth in modified gravity theories of dark energy", Phys. Rev. D. 77 (2008) 024048 arXiv:0709.0307 (astro- ph).

- P. Zhang, M. Liguori, R. Bean, S. Dodelson, "A discriminating probe of

gravity at cosmological scales", Phys. Rev. Lett. 99, 141302 (2007), arxiv:0704.1932 (astro-ph).

- R. Bean, S. E. Shandera, H. R. H. Tye, J. Xu, "Comparing Brane Inflation to WMAP", JCAP 05 (2007) 004, arxiv: hep-th/0702107.

- R. Bean, A. Melchiorri, J. Silk, "Cosmological constraints in the presence of ionizing and resonance radiation at recombination", Phys. Rev. D 75 (2007) 063505, arxiv: Astro-ph/0701224.

- R. Bean, D. Bernat, L. Pogosian, A. Silvestri, M. Trodden, "Dynamics of linear perturbations in f(R) gravity", Phys. Rev. D 75 (2007) 064020, arxiv: astro-ph/0611321.

- R. Bean, J. Dunkley, E. Pierpaoli, "Constraining isocurvature initial

conditions with WMAP three-year data", Phys. Rev. D 74, (2006) 063503 , arxiv: astro-ph/0606685.

- D. N. Spergel, R. Bean, O. Dore, M. R. Nolta, et al. (WMAP collaboration) "Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology", Astrophys.J.Suppl. 170:377, 2007, arxiv:astro-ph/0603449.