{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:29:22Z","timestamp":1772252962136,"version":"3.50.1"},"reference-count":70,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2020,9,21]],"date-time":"2020-09-21T00:00:00Z","timestamp":1600646400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001412","name":"Council\u00a0of\u00a0Scientific and Industrial Research, India","doi-asserted-by":"publisher","award":["03(1420)\/18\/EMR-II"],"award-info":[{"award-number":["03(1420)\/18\/EMR-II"]}],"id":[{"id":"10.13039\/501100001412","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004561","name":"Ministry of Education and Science of the Republic of Kazakhstan","doi-asserted-by":"publisher","award":["AP08052034"],"award-info":[{"award-number":["AP08052034"]}],"id":[{"id":"10.13039\/501100004561","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>The present study reports a reconstruction scheme for f(R) gravity with the scale factor a(t)\u221d(t*\u2212t)2c2 describing the pre-bounce ekpyrotic contraction, where t* is the big crunch time. The reconstructed f(R) is used to derive expressions for density and pressure contributions, and the equation of state parameter resulting from this reconstruction is found to behave like \u201cquintom\u201d. It has also been observed that the reconstructed f(R) has satisfied a sufficient condition for a realistic model. In the subsequent phase, the reconstructed f(R) is applied to the model of the chameleon scalar field, and the scalar field \u03d5 and the potential V(\u03d5) are tested for quasi-exponential expansion. It has been observed that although the reconstructed f(R) satisfies one of the sufficient conditions for realistic model, the quasi-exponential expansion is not available due to this reconstruction. Finally, the consequences of pre-bounce ekpyrotic inflation in f(R) gravity are compared to the background solution for f(R) matter bounce.<\/jats:p>","DOI":"10.3390\/sym12091559","type":"journal-article","created":{"date-parts":[[2020,9,21]],"date-time":"2020-09-21T08:18:01Z","timestamp":1600676281000},"page":"1559","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Reconstructed f(R) Gravity and Its Cosmological Consequences in theChameleon Scalar Field with a Scale Factor Describing the Pre-Bounce Ekpyrotic Contraction"],"prefix":"10.3390","volume":"12","author":[{"given":"Soumyodipta","family":"Karmakar","sequence":"first","affiliation":[{"name":"Department of Mathematics, Amity University Kolkata, Major Arterial Road, Action Area II, Rajarhat, New Town, Kolkata 700135, India"}]},{"given":"Kairat","family":"Myrzakulov","sequence":"additional","affiliation":[{"name":"Eurasian International Center for Theoretical Physics, Eurasian National University, Nur-Sultan 010008, Kazakhstan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5175-2873","authenticated-orcid":false,"given":"Surajit","family":"Chattopadhyay","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Amity University Kolkata, Major Arterial Road, Action Area II, Rajarhat, New Town, Kolkata 700135, India"}]},{"given":"Ratbay","family":"Myrzakulov","sequence":"additional","affiliation":[{"name":"Eurasian International Center for Theoretical Physics, Eurasian National University, Nur-Sultan 010008, Kazakhstan"}]}],"member":"1968","published-online":{"date-parts":[[2020,9,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1009","DOI":"10.1086\/300499","article-title":"Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant","volume":"116","author":"Riess","year":"1998","journal-title":"Astron. 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