{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,7]],"date-time":"2026-06-07T04:01:06Z","timestamp":1780804866313,"version":"3.54.1"},"reference-count":90,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2018,5,17]],"date-time":"2018-05-17T00:00:00Z","timestamp":1526515200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>Mimetic gravity is analysed in the framework of some extensions of general relativity (GR), whereby a function of the Gauss\u2013Bonnet invariant in four dimensions is considered. By assuming the mimetic condition, the conformal degree of freedom is isolated, and a pressureless fluid naturally arises. Then, the complete set of field equations for mimetic Gauss\u2013Bonnet gravity is established, and some inflationary models are analysed, for which the corresponding gravitational action is reconstructed. The spectral index and tensor-to-scalar ratio are obtained and compared with observational bounds from Planck and BICEP2\/Keck array data. Full agreement with the above data is achieved for several versions of the mimetic Gauss\u2013Bonnet gravity. Finally, some extensions of Gauss\u2013Bonnet mimetic gravity are considered, and the possibility of reproducing inflation is also explored.<\/jats:p>","DOI":"10.3390\/sym10050170","type":"journal-article","created":{"date-parts":[[2018,5,17]],"date-time":"2018-05-17T11:47:45Z","timestamp":1526557665000},"page":"170","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Inflation in Mimetic f(G) Gravity"],"prefix":"10.3390","volume":"10","author":[{"given":"Yi","family":"Zhong","sequence":"first","affiliation":[{"name":"Institut de Ci\u00e8ncies de l\u2019Espai (ICE, CSIC), Carrer de Can Magrans s\/n, 08193 Barcelona, Spain"},{"name":"Institut d\u2019Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain"},{"name":"Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0714-2680","authenticated-orcid":false,"given":"Diego","family":"S\u00e1ez-Chill\u00f3n G\u00f3mez","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncies de l\u2019Espai (ICE, CSIC), Carrer de Can Magrans s\/n, 08193 Barcelona, Spain"},{"name":"Institut d\u2019Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2018,5,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Liddle, A.R., and Lyth, D.H. 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