2011/02/28 by Özgür Akarsu, Ozgur Akarsu, Tekin Dereli · 1 citation
Physics and Astronomy · #Advanced Mathematical Theories and Applications #Constant (computer programming) #Cosmological constant #Cosmological model #Cosmology #Cosmology and Gravitation Theories #Deceleration parameter #Metric expansion of space #Relativity and Gravitational Theory #Universe #gr-qc
paper · pdf · doi:10.1007/s10773-011-0941-5
published as International Journal of Theoretical Physics 51 (2012) 612-621 · 12 pages, 7 figures; some typo corrections; to appear in International Journal of Theoretical Physics
arxiv created 2011/09/08 · openalex publication_date 2011/09/12 · arxiv updated 2012/01/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We propose a new law for the deceleration parameter that varies linearly with time and covers Berman's law where it is constant. Our law not only allows one to generalize many exact solutions that were obtained assuming constant deceleration parameter, but also gives a better fit with data (from SNIa, BAO and CMB), particularly concerning the late time behavior of the universe. According to our law only the spatially closed and flat universes are allowed; in both cases the cosmological fluid we obtain exhibits quintom like behavior and the universe ends with a big-rip. This is a result consistent with recent cosmological observations.