Professor Richard Easther
I grew up in New Zealand, and was educated at the University of Canterbury. After graduating with my PhD 1994 I held post-doctoral fellowships at Waseda University in Japan and at Brown and Columbia Universities in the United States.
I was a professor at Yale University from 2004 until the end of 2011, when I returned to New Zealand. I am now a professor and Head of the Department of Physics here at the University of Auckland.
Research | Current
My work focuses on the physics of the very early universe. I explore the cosmological implications of string theory and the inflationary epoch, a period of accelerated expansion immediately after the big bang thought to set the stage for the subsequent evolution of the universe.
I am interested in the evolution of the universe during the "primordial dark ages" between the end of inflation and the nucleosynthesis era, a period a few minutes after the big bang when chemical elements more complicated than hydrogen are first formed.
The growth of cosmological perturbations during this phase depends on the nature of dark matter and other phenomena outside the "standard model" of particle physics, allowing cosmology to reveal unknown particle physics.
- The physics of the very early universe
- Inflationary cosmology
- The cosmological implications of string theory
- The multiverse and eternal inflation
- Astrophysical tests of models of the early universe
- Dark matter and cosmological observables
Selected publications and creative works (Research Outputs)
- Aslanyan, G., Price, L. C., Adams, J., Bringmann, T., Clark, H. A., Easther, R., ... Scott, P. (2016). Ultracompact Minihalos as Probes of Inflationary Cosmology. Phys Rev Lett, 117 (14)10.1103/PhysRevLett.117.141102
- Canac, N., Aslanyan, G., Abazajian, K. N., Easther, R., & Price, L. C. (2016). Testing for new physics: neutrinos and the primordial power spectrum. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (9)10.1088/1475-7516/2016/09/022
- Price, L. C., Peiris, H. V., Frazer, J., & Easther, R. (2016). Designing and testing inflationary models with Bayesian networks. Journal of Cosmology and Astroparticle Physics, 2016 (02), 049-049. 10.1088/1475-7516/2016/02/049
- Aslanyan, G., Easther, R., & Price, L. C. (2015). Learn-as-you-go acceleration of cosmological parameter estimates. Journal of Cosmology and Astroparticle Physics, 2015 (9).10.1088/1475-7516/2015/09/005
- Aslanyan, G., & Easther, R. (2015). Signatures of the very early Universe: Inflation, spatial curvature, and large scale anomalies. Physical Review D, 91 (12), 123523-1-123523-8. 10.1103/PhysRevD.91.123523
- Price, L. C., Frazer, J., Xu, J., Peiris, H. V., & Easther, R. (2015). MULTIMODECODE: an efficient numerical solver for multifield inflation. Journal of Cosmology and Astroparticle Physics, 2015 (03).10.1088/1475-7516/2015/03/005
- Price, L. C., Peiris, H. V., Frazer, J., & Easther, R. (2015). Gravitational wave consistency relations for multifield inflation. Physical Review Letters, 114 (3), 031301-1-031301-6. 10.1103/PhysRevLett.114.031301
- Abazajian, K. N., Aslanyan, G., Easther, R., & Price, L. C. (2014). The Knotted Sky II: Does BICEP2 require a nontrivial primordial power spectrum?. Journal of Cosmology and Astroparticle Physics, 2014 (8).10.1088/1475-7516/2014/08/053