Evidence for a Low-Density Universe from the Relative Velocities of Galaxies
نویسندگان
چکیده
منابع مشابه
Evidence for a low-density universe from the relative velocities of galaxies
The motions of galaxies can be used to constrain the cosmological density parameter Omega and the clustering amplitude of matter on large scales. The mean relative velocity of galaxy pairs, estimated from the Mark III survey, indicates that Omega = 0.35(-0.25)(+0.35). If the clustering of galaxies is unbiased on large scales, Omega = 0. 35 +/- 0.15, so that an unbiased Einstein-de Sitter model ...
متن کامل0 Evidence for a low density Universe from the relative velocities of galaxies
∗ Département de Physique Théorique, Université de Genève, CH-1211 Genève, Switzerland § Copernicus Astronomical Center, 00-716 Warsaw, Poland ‖ Theory Group, CERN, CH-1211, Genève 23, Switzerland ¶ CENTRA, Instituto Superior Tecnico, Lisboa 1096 Codex, Portugal # Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045 Center for Particle Astrophysics, University of Califo...
متن کاملthe effect of traffic density on the accident externality from driving the case study of tehran
در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...
15 صفحه اولA Low-Density Closed Universe.
Matter with an equation of state p 2ry3 may arise in certain scalar field theories, and the energy density of this matter decreases as a22 with the scale factor a of the Universe. In this case, the Universe could be closed but still have a nonrelativistic-matter density V0 , 1. Furthermore, the cosmic microwave background could come from a causally connected region at the other side of the Un...
متن کاملinvestigating the feasibility of a proposed model for geometric design of deployable arch structures
deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
ذخیره 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: Science
سال: 2000
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.287.5450.109