2008/06/30 by Sugumi Kanno, Masashi Kimura, Jiro Soda +1 · 9 citations
Earth and Planetary Sciences · Physics and Astronomy · #Anisotropy #Astrophysics #Classical mechanics #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Curvature #Dark energy #Galaxies: Formation, Evolution, Phenomena #Geometry #Geophysics and Gravity Measurements #Gravitation #Gravitational wave #Inflation (cosmology) #Metric expansion of space #Observable #Physics #Primordial fluctuations #Quantum electrodynamics #Quantum mechanics #Theoretical physics #Universe #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2008/08/034
published as JCAP0808:034,2008 · 16 pages, 4 figures, improved section V, to be published in JCAP
arxiv created 2008/08/01 · openalex publication_date 2008/08/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study an inflationary scenario with a vector impurity. We show that the universe undergoes anisotropic inflationary expansion due to a preferred direction determined by the vector. Using the slow roll approximation, we find a formula for determining the anisotropy of the inflationary universe. We discuss possible observable predictions of this scenario. In particular, it is stressed that primordial gravitational waves can be induced from curvature perturbations. Hence, even in low scale inflation, a sizable amount of primordial gravitational waves may be produced during inflation.