Ekpyrotic Nongaussianity: A Review
Ekpyrotic models and their cyclic extensions solve the standard cosmological flatness, horizon, and homogeneity puzzles by postulating a slowly contracting phase of the universe prior to the big bang. This ekpyrotic phase also manages to produce a nearly scale-invariant spectrum of scalar density fl...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2010-01-01
|
| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2010/903907 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832566958219853824 |
|---|---|
| author | Jean-Luc Lehners |
| author_facet | Jean-Luc Lehners |
| author_sort | Jean-Luc Lehners |
| collection | DOAJ |
| description | Ekpyrotic models and their cyclic extensions solve the standard cosmological flatness, horizon, and homogeneity puzzles by postulating a slowly contracting phase of the universe prior to the big bang. This ekpyrotic phase also manages to produce a nearly scale-invariant spectrum of scalar density fluctuations but, crucially, with significant nongaussian corrections. In fact, some versions of ekpyrosis are on the borderline of being ruled out by observations, while, interestingly, the best-motivated models predict levels of nongaussianity that will be measurable by near-future experiments. Here, we review these predictions in detail, and comment on their implications. |
| format | Article |
| id | doaj-art-787badbf1dfe434b95b52ef54f238328 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2010-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-787badbf1dfe434b95b52ef54f2383282025-02-03T01:02:43ZengWileyAdvances in Astronomy1687-79691687-79772010-01-01201010.1155/2010/903907903907Ekpyrotic Nongaussianity: A ReviewJean-Luc Lehners0Princeton Center for Theoretical Science, Princeton University, Princeton, NJ 08544, USAEkpyrotic models and their cyclic extensions solve the standard cosmological flatness, horizon, and homogeneity puzzles by postulating a slowly contracting phase of the universe prior to the big bang. This ekpyrotic phase also manages to produce a nearly scale-invariant spectrum of scalar density fluctuations but, crucially, with significant nongaussian corrections. In fact, some versions of ekpyrosis are on the borderline of being ruled out by observations, while, interestingly, the best-motivated models predict levels of nongaussianity that will be measurable by near-future experiments. Here, we review these predictions in detail, and comment on their implications.http://dx.doi.org/10.1155/2010/903907 |
| spellingShingle | Jean-Luc Lehners Ekpyrotic Nongaussianity: A Review Advances in Astronomy |
| title | Ekpyrotic Nongaussianity: A Review |
| title_full | Ekpyrotic Nongaussianity: A Review |
| title_fullStr | Ekpyrotic Nongaussianity: A Review |
| title_full_unstemmed | Ekpyrotic Nongaussianity: A Review |
| title_short | Ekpyrotic Nongaussianity: A Review |
| title_sort | ekpyrotic nongaussianity a review |
| url | http://dx.doi.org/10.1155/2010/903907 |
| work_keys_str_mv | AT jeanluclehners ekpyroticnongaussianityareview |