In this article, we present an emergent universe scenario that can be derived from DHOST cosmology. The universe starts asymptotically Minkowski in the far past just like the regular Galileon Genesis, but evolves to a radiation dominated period at the late stage, and therefore, the universe has a graceful exit which is absent in the regular Galileon Genesis. We analyze the behavior of cosmological perturbations and show that both the scalar and tensor modes are free from the gradient instability problem. We further analyze the primordial scalar spectrum generated in various situations and discuss whether a scale invariance can be achieved.
{ "_oai": { "updated": "2021-05-27T10:31:12Z", "id": "oai:repo.scoap3.org:59599", "sets": [ "JHEP" ] }, "authors": [ { "affiliations": [ { "country": "China", "value": "Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" }, { "country": "China", "value": "CAS Key Laboratory for Researches in Galaxies and Cosmology, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" }, { "country": "China", "value": "School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" } ], "surname": "Ilyas", "email": "aarks@mail.ustc.edu.cn", "full_name": "Ilyas, Amara", "given_names": "Amara" }, { "affiliations": [ { "country": "Hong Kong", "value": "Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong S.A.R., China", "organization": "The Hong Kong University of Science and Technology" }, { "country": "Hong Kong", "value": "HKUST Jockey Club Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong S.A.R., China", "organization": "The Hong Kong University of Science and Technology" } ], "surname": "Zhu", "email": "mzhuan@connect.ust.hk", "full_name": "Zhu, Mian", "given_names": "Mian" }, { "affiliations": [ { "country": "China", "value": "Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" }, { "country": "China", "value": "CAS Key Laboratory for Researches in Galaxies and Cosmology, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" }, { "country": "China", "value": "School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" } ], "surname": "Zheng", "email": "zhyunl@ustc.edu.cn", "full_name": "Zheng, Yunlong", "given_names": "Yunlong" }, { "affiliations": [ { "country": "China", "value": "Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" }, { "country": "China", "value": "CAS Key Laboratory for Researches in Galaxies and Cosmology, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" }, { "country": "China", "value": "School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui, 230026, China", "organization": "University of Science and Technology of China" } ], "surname": "Cai", "email": "yifucai@ustc.edu.cn", "full_name": "Cai, Yi-Fu", "given_names": "Yi-Fu" } ], "titles": [ { "source": "Springer", "title": "Emergent universe and Genesis from the DHOST cosmology" } ], "dois": [ { "value": "10.1007/JHEP01(2021)141" } ], "publication_info": [ { "page_end": "22", "journal_title": "Journal of High Energy Physics", "material": "article", "journal_volume": "2021", "artid": "JHEP01(2021)141", "year": 2021, "page_start": "1", "journal_issue": "1" } ], "$schema": "http://repo.scoap3.org/schemas/hep.json", "acquisition_source": { "date": "2021-05-27T09:44:11.805010", "source": "Springer", "method": "Springer", "submission_number": "fcd98c30becf11eb92440a580a640a05" }, "page_nr": [ 22 ], "license": [ { "url": "https://creativecommons.org/licenses//by/4.0", "license": "CC-BY-4.0" } ], "copyright": [ { "holder": "The Author(s)", "year": "2021" } ], "control_number": "59599", "record_creation_date": "2021-01-24T01:31:38.066539", "_files": [ { "checksum": "md5:71339253615bf2a0faccea5ac4d04554", "filetype": "xml", "bucket": "e492b9e2-0c45-4f78-9b17-bb832eb1b1c0", "version_id": "eb63fa1a-9669-4158-a341-a3a129303a6d", "key": "10.1007/JHEP01(2021)141.xml", "size": 13662 }, { "checksum": "md5:f7369b4b2c6bbd471455e4233c325903", "filetype": "pdf/a", "bucket": "e492b9e2-0c45-4f78-9b17-bb832eb1b1c0", "version_id": "1bd2ea68-249b-4850-b0ac-23b4f64d885e", "key": "10.1007/JHEP01(2021)141_a.pdf", "size": 726452 } ], "collections": [ { "primary": "Journal of High Energy Physics" } ], "arxiv_eprints": [ { "categories": [ "gr-qc", "astro-ph.CO", "hep-ph", "hep-th" ], "value": "2009.10351" } ], "abstracts": [ { "source": "Springer", "value": "In this article, we present an emergent universe scenario that can be derived from DHOST cosmology. The universe starts asymptotically Minkowski in the far past just like the regular Galileon Genesis, but evolves to a radiation dominated period at the late stage, and therefore, the universe has a graceful exit which is absent in the regular Galileon Genesis. We analyze the behavior of cosmological perturbations and show that both the scalar and tensor modes are free from the gradient instability problem. We further analyze the primordial scalar spectrum generated in various situations and discuss whether a scale invariance can be achieved." } ], "imprints": [ { "date": "2021-01-22", "publisher": "Springer" } ] }