2016/12/31 by F. Naderi, A. Rezaei-Aghdam
Mathematics · Physics and Astronomy · #Anisotropy #Black Holes and Theoretical Physics #Classical mechanics #Combinatorics #Cosmology #Cosmology and Gravitation Theories #Homogeneous #Loop (graph theory) #Mathematical physics #Mathematics #Noncommutative and Quantum Gravity Theories #Physics #Quantum electrodynamics #Quantum gravity #Quantum mechanics #Relationship between string theory and quantum field theory #Statistical physics #String (physics) #String cosmology #Theoretical physics #gr-qc #hep-th
paper · pdf · doi:10.1016/j.nuclphysb.2017.08.005
published as Nucl. Phys. B923 (2017) 416-457 · 33 pages
openalex publication_date 2017/08/16 · arxiv created 2017/10/18 · arxiv updated 2017/10/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The two-loop (order α ′ ) β -function equations, which are equivalent to the equations of motion of α ′ -corrected string effective action, are considered for anisotropic homogeneous space–times. These equations are solved for all Bianchi-type models in two schemes of effective action, namely R 2 and Gauss–Bonnet schemes with zero cosmological constant and then the metric, dilaton and B -field are found at α ′ perturbative corrections.