Năstase, Horaţiu [UNESP]2020-12-122020-12-122019-01-01Fundamental Theories of Physics, v. 197, p. 391-403.2365-64250168-1222http://hdl.handle.net/11449/200489In this chapter we will first describe a simple generalization of the previously defined string gas cosmology, namely brane gas; and then we will calculate the spectrum of scalar and tensor perturbations in string gas cosmology.391-403engCapítulo de livro10.1007/978-3-030-15077-8_332-s2.0-85085206906