A spatial correlation analysis for a toroidal universe

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A spatial correlation analysis for a toroidal universe

The spatial cross-correlation function ξC recently introduced by Roukema et al. [1] is applied to an equilateral toroidal topology of the universe. Several CMB maps based on the WMAP 3yr and 5yr data are analysed and a small likelihood in favour of a torus cell is revealed. The results are compared to five ΛCDM simulations which point to a high false positive rate of the spatial-correlation-fun...

متن کامل

Particle creation in a toroidal universe

Although current astrophysical observations provide precise information on the geometry of the universe [1], its topology remains a mystery. We don’t even know whether the universe is compact or infinite. Nevertheless, lower bounds can be placed on its size for each compact topology (see Ref. [2] and references therein). Amongst the possible topologies for the universe, those with some or all s...

متن کامل

a time-series analysis of the demand for life insurance in iran

با توجه به تجزیه و تحلیل داده ها ما دریافتیم که سطح درامد و تعداد نمایندگیها باتقاضای بیمه عمر رابطه مستقیم دارند و نرخ بهره و بار تکفل با تقاضای بیمه عمر رابطه عکس دارند

The Energy Density of ”Wound” Fields in a Toroidal Universe

The observational limits on the present energy density of the Universe allow for a component that redshifts like 1/a and can contribute significantly to the total. We show that a possible origin for such a contribution is that the universe has a toroidal topology with ”wound” scalar fields around its cycles.

متن کامل

COBE Constraints on a Compact Toroidal Low-density Universe

In this paper, the cosmic microwave background (CMB) anisotropy in a multiply-connected compact flat 3-torus model with the cosmological constant is investigated. Using the COBE-DMR 4-year data, a full Bayesian analysis revealed that the constraint on the topology of the flat 3-torus model with low-matter-density is less stringent. As in compact hyperbolic models, the large-angle temperature fl...

متن کامل

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: Classical and Quantum Gravity

سال: 2008

ISSN: 0264-9381,1361-6382

DOI: 10.1088/0264-9381/25/22/225017