The Future of Primordial Features with Large-Scale Structure Surveys

November 16, 2016

Primordial features are one of the most important extensions of the Standard Model of cosmology, providing a wealth of information on the primordial Universe, ranging from discrimination between inflation and alternative scenarios, new particle detection, to fine structures in the inflationary potential. Prof. Cora Dvorkin and colleagues from Harvard-Smithsonian CfA, Sun Yat-Sen University, and University of Barcelona published an article in Journal of Cosmology and Astroparticle Physics in which they examine the prospects of future large-scale structure (LSS) surveys on the detection and constraints of these features. The authors classify primordial feature models into several classes, and present for each class a simple template of power spectrum that encodes the essential physics. They study how well the most ambitious LSS surveys proposed to date, including both spectroscopic and photometric surveys, will be able to improve the constraints with respect to the current Planck data. They find that these LSS surveys will significantly improve the experimental sensitivity on features signals that are oscillatory in scales, due to the 3D information. For a broad range of models, these surveys will be able to reduce the errors of the amplitudes of the features by a factor of 5 or more, including several interesting candidates identified in the recent Planck data. Therefore, LSS surveys offer an impressive opportunity for primordial feature discovery in the next decade or two.

See X. Chena, C. Dvorkin, Z. Huangd, M.H. Namjooa, and L. Verdee, "The future of primordial features with large-scale structure surveys," Journal of Cosmology and Astroparticle Physics (November 2016) DOI: 10.1088/1475-7516/2016/11/014.