o:1392 Inflatorni kosmološki modeli sa tahionskim i radionskim poljima Infationary cosmological models with tachyon and radion fields : doctoral dissertation sr A popular class of the inflationary cosmological models is based on an introduction of a scalar field with nonstandard tachyonic Lagrangian of the Dirac-Born-Infeld (DBI) type. A potentially fundamental role of the tachyon fields in the braneworld cosmology was proposed by A. Sen. Research in this PhD thesis is motivated by Randall-Sundrum (RSII) cosmological model. The main objective of the research is to formulate and solve an analytical- numerical inflationary model with DBI-tachyon field and RSII model with an additional radion field, as well computation of observational parameters. Obtained results are in a good agreement with the real astrophysical data and provide a better understanding of the role of strings and branes in modern cosmology. The results indicated that role of radion in an initial RSII setup is less important than expected. Biografija autora: list 95 Datum odbrane: 15.06.2017. Cosmology 1025490153 91552101 5224 91552100 1025490153 2017-09-04T18:22:27.053Z 45 no 46 mentor Milan D. 1981- Milošević 2017 63 mentor Goran 1963- Đorđević 2017 63 član komisije Ljubiša 1966- Nešić 2017 63 član komisije Predrag Jovanović 2017 95 listova 2915724 http://phaidrabg.bg.ac.rs/o:1392 no yes 5 2017-09-04T18:22:27.320Z 70 Kosmologija, inflacija, Randal-Sundrum model, DBI la-granžijan, tahioni Cosmology, inflation, Randal-Sundrum model, DBI Lagrangian,tachyons 524.82:524.834 P 210 1738 18A07 18A0702 2017