caa a22 4500 467887837 CHVBK 20180406152739.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s10714-005-0223-8 doi (NATIONALLICENCE)springer-10.1007/s10714-005-0223-8 Inflationary and dark energy regimes in 2+1 dimensions [Elektronische Daten] [M. Christmann, F. Devecchi, G. Kremer, C. Zanetti] In this work we investigate the behavior of three-dimensional (3D) cosmological models. The simulation of inflationary and dark-energy-dominated eras are among the possible results in these 3D formulations; taking as starting point the results obtained by Cornish and Frankel. Motivated by those results, we investigate, first, the inflationary case where we consider a two-constituent cosmological fluid: the scalar field represents the hypothetical inflaton which is in gravitational interaction with a matter/radiation contribution. For the description of an old universe, it is possible to simulate its evolution starting with a matter dominated universe that faces a decelerated/accelerated transition due to the presence of the additional constituent (simulated by the scalar field or ruled by an exotic equation of state) that plays the role of dark energy. We obtain, through numerical analysis, the evolution in time of the scale factor, the acceleration, the energy densities, and the hydrostatic pressure of the constituents. The alternative scalar cosmology proposed by Cornish and Frankel is also under investigation in this work. In this case an inflationary model can be constructed when another non-polytropic equation of state (the van der Waals equation) is used to simulate the behavior of an early 3D universe. Springer-Verlag, 2005 Cosmological models in lower dimensions nationallicence Christmann M. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut Devecchi F. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut Kremer G. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut Zanetti C. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut General Relativity and Gravitation Springer US; http://www.springer-ny.com 38/2(2006-02-01), 333-344 0001-7701 38:2<333 2006 38 10714 https://doi.org/10.1007/s10714-005-0223-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-005-0223-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Christmann M. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut NATIONALLICENCE 700 1- Devecchi F. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut NATIONALLICENCE 700 1- Kremer G. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut NATIONALLICENCE 700 1- Zanetti C. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Brazil aut NATIONALLICENCE 773 0- General Relativity and Gravitation Springer US; http://www.springer-ny.com 38/2(2006-02-01), 333-344 0001-7701 38:2<333 2006 38 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer