Understanding the Gaussianity of the Primordial Universe

Dear Colleagues,

Assessing the Gaussianity of primordial cosmological perturbations has been an open issue over the last few decades. On the theoretical level, primordial non-Gaussianity is a key feature of most inflationary scenarios, and it has been argued that non-detectability of non-Gaussianity is the only means of falsifying inflation. Currently, the tightest available constraints on primordial non-Gaussianity come from bounds on higher-order correlation functions of anisotropies in the cosmic microwave background radiation. However, only non-Gaussianity of the local type is tightly constrained, whereas a vast parameter space for other kinds of non-Gaussianity is still allowed by data. For this reason, future cosmological experiments plan to address this issue with a variety of techniques and carrying out observations all across the electromagnetic spectrum.

This Special Issue of Galaxies is intended to review the development of both our theoretical understanding of non-Gaussianity and the observational effort aimed at its measurement. We would like to call for papers that either enlighten the mechanisms by which non-Gaussianity may arise and manifest in the early Universe, or put bounds on the level of non-Gaussianity allowed by currently available data, or forecast the constraining power of upcoming cosmological experiments. Review papers are also most welcome.

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Galaxies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• primordial non-Gaussianity
• inflation
• cosmic large-scale structure