{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T01:55:42Z","timestamp":1777082142150,"version":"3.51.4"},"reference-count":33,"publisher":"IOP Publishing","issue":"22","license":[{"start":{"date-parts":[[2020,10,21]],"date-time":"2020-10-21T00:00:00Z","timestamp":1603238400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2020,10,21]],"date-time":"2020-10-21T00:00:00Z","timestamp":1603238400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","award":["PTDC\/MAT-ANA\/1275\/2014 UID\/MAT\/04459\/2019 UIDB\/MAT\/04459\/2020"],"award-info":[{"award-number":["PTDC\/MAT-ANA\/1275\/2014 UID\/MAT\/04459\/2019 UIDB\/MAT\/04459\/2020"]}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Class. Quantum Grav."],"published-print":{"date-parts":[[2020,11,19]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    We derive a new\n                    <jats:italic>regular<\/jats:italic>\n                    dynamical system on a three-dimensional\n                    <jats:italic>compact<\/jats:italic>\n                    state space describing linear scalar perturbations of spatially flat Robertson\u2013Walker geometries for relativistic models with a minimally coupled scalar field with an exponential potential. This enables us to construct the global solution space, illustrated with figures, where known solutions are shown to reside on special invariant sets. We also use our dynamical systems approach to obtain new results about the comoving and uniform density curvature perturbations. Finally we show how to extend our approach to more general scalar field potentials. This leads to state spaces where the state space of the models with an exponential potential appears as invariant boundary sets, thereby illustrating their role as building blocks in a hierarchy of increasingly complex cosmological models.\n                  <\/jats:p>","DOI":"10.1088\/1361-6382\/abb73a","type":"journal-article","created":{"date-parts":[[2020,9,10]],"date-time":"2020-09-10T18:33:34Z","timestamp":1599762814000},"page":"225011","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":10,"title":["<scp>D<\/scp>\n                    ynamical systems in perturbative scalar field cosmology"],"prefix":"10.1088","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5753-8333","authenticated-orcid":false,"given":"Artur","family":"Alho","sequence":"first","affiliation":[]},{"given":"Claes","family":"Uggla","sequence":"additional","affiliation":[]},{"given":"John","family":"Wainwright","sequence":"additional","affiliation":[]}],"member":"266","published-online":{"date-parts":[[2020,10,21]]},"reference":[{"key":"cqgabb73abib1","doi-asserted-by":"publisher","DOI":"10.1088\/1475-7516\/2019\/09\/045","type":"journal-article","article-title":"Perturbations of the lambda-CDM model in a dynamical systems perspective","author":"Alho","year":"2019","journal-title":"J. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2020-06-03","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2020-09-10","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2020-10-21","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}