منابع مشابه
Did the Universe Reionize at Redshift Six?
In light of recent observations of quasar spectra by Becker et al. (2001) and Djorgovski et al. (2001), we study the observational signatures of different stages of the reionization epoch. During the initial, pre-overlap stage, the hydrogen throughout the universe is neutral except for isolated H II bubbles due to individual ionizing sources. The central stage of reionization is the overlap sta...
متن کاملDark Matter in a One-dimensional Universe
— A computer code to simulate temporal evolution of overdensities in a one-dimensional Universe is presented for didactic purposes. The formation of large scale structures in this one-dimensional universe can be studied both in matter or radiation dominated eras. Since large scale structures are already observed at z ≥ 7, primordial dark matter overdensities δDM which are 90 times larger than t...
متن کاملGravitational clustering in a D-dimensional universe
We consider the problem of gravitational clustering in a D-dimensional expanding universe and derive scaling relations connecting the exact mean two-point correlation function with the linear mean correlation function, in the quasilinear and nonlinear regimes, using the standard paradigms of scale-invariant radial collapse and stable clustering. We show that the existence of scaling laws is a g...
متن کاملSix-Dimensional String Theories
We consider N = 1, D = 4 superconformal U(N) Yang-Mills theories dual to AdS5 × S/Zp × Zq orbifolds. We construct the dilatation operator of this superconformal gauge theory at one-loop planar level. We demonstrate that a specific sector of this dilatation operator can be thought of as the transfer matrix for a two-dimensional statistical mechanical system, related to an integrable SU(3) antife...
متن کاملSix Dimensional Trajectory Solver
Many future space missions will require that proximity operations be accomplished reliably, precisely and efficiently without a pilot in the loop. This thesis examines one element of an autonomous proximity operations controller, the trajectory planner. The trajectory planner uses a modified gradient search to find a locally optimal trajectory from the initial state to the target state that doe...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Il Nuovo Cimento A
سال: 1991
ISSN: 0369-3546,1826-9869
DOI: 10.1007/bf02799151