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The Cosmic Microwave Background provides our most ancient image of the Universe and our best tool for studying its early evolution. Theories of high energy physics predict the formation of various types of topological defects in the very…

天体物理学 · 物理学 2011-09-29 M. Cruz , N. Turok , P. Vielva , E. Martinez-Gonzalez , M. Hobson

A new map of the sky representing the degree of randomness in the cosmic microwave background (CMB) temperature has been obtained. The map based on estimation of the Kolmogorov stochasticity parameter clearly distinguishes the contribution…

The report of a significant deviation of the CMB temperature anisotropies distribution from Gaussianity (soon after the public release of the WMAP data in 2003) has become one of the most solid WMAP anomalies. This detection grounds on an…

宇宙学与河外天体物理 · 物理学 2015-05-19 P. Vielva

New analysis confirms our earlier claim [1], [7] of circles of notably low temperature variance, often in concentric sets, in the cosmic microwave background (CMB), discernable in WMAP data. Their reality can be interpreted as evidence of…

宇宙学与河外天体物理 · 物理学 2011-05-04 V. G. Gurzadyan , R. Penrose

A cosmological model, in which the cosmic microwave background (CMB) is a thermal radiation of intergalactic dust instead of a relic radiation of the Big Bang, is revived and revisited. The model suggests that a virtually transparent local…

宇宙学与河外天体物理 · 物理学 2018-04-30 Vaclav Vavrycuk

The integrated Sachs-Wolfe imprint of extreme structures in the cosmic web probes the dynamical nature of dark energy. Looking through typical cosmic voids, no anomalous signal has been reported. On the contrary, supervoids, associated with…

宇宙学与河外天体物理 · 物理学 2018-02-07 András Kovács

The standard cosmological paradigm narrates a reassuring story of a universe currently dominated by an enigmatic dark energy component. Disquietingly, its universal explaining power has recently been challenged by, above all, the…

宇宙学与河外天体物理 · 物理学 2020-09-09 András Kovács , Róbert Beck , István Szapudi , István Csabai , Gábor Rácz , László Dobos

The absolute temperature of the cosmic microwave background (CMB) has been measured at a frequency of 1280 MHz. The observation was made with a modified version of the L-band receiver used in the Giant Metre wavelength Radio Telescope…

天体物理学 · 物理学 2007-05-23 A. Raghunathan , R. Subrahmanyan

The measurement of present-day temperature of the Cosmic Microwave Background (CMB), $T_0 = 2.72548 \pm 0.00057$ K (1$\sigma$), made by the Far-InfraRed Absolute Spectrophotometer (FIRAS), is one of the most precise measurements ever made…

宇宙学与河外天体物理 · 物理学 2020-10-14 Carlos A. P. Bengaly , Javier E. Gonzalez , Jailson S. Alcaniz

The large-angular-scale falloff in the autocorrelation function for the cosmic microwave background (CMB) temperature has long intrigued cosmologists and fueled speculation about suppressed superhorizon power. Here we highlight an…

宇宙学与河外天体物理 · 物理学 2023-11-13 Jahmour J. Givans , Marc Kamionkowski

We estimate the Rees--Sciama (RS) effect of super structures on the cosmic microwave background (CMB) temperature fluctuations and identify a related effect on galaxy redshifts. By numerically solving the geodesic equation, we find that…

宇宙学与河外天体物理 · 物理学 2015-05-28 Hu Zhan

The standard method for observationally confirming the existence of a predicted finite topology of the universe involves searching for the repetition of the same finite or extended source in different directions. However, serious problems…

天体物理学 · 物理学 2007-05-23 Reuven Opher

Cosmic structures leave an imprint on the microwave background radiation through the integrated Sachs-Wolfe effect. We construct a template map of the linear signal using the SDSS-III Baryon Acoustic Oscillation Survey at redshift 0.43 < z…

宇宙学与河外天体物理 · 物理学 2015-10-29 Benjamin R. Granett , András Kovács , Adam J. Hawken

Recent measurements of the temperature field of Cosmic Microwave Background (CMB) provide tantalising evidence for violation of Statistical Isotropy (SI) that constitutes a fundamental tenet of contemporary cosmology. CMB space based…

宇宙学与河外天体物理 · 物理学 2016-06-08 Suvodip Mukherjee , Tarun Souradeep

We show that the thermal Sunyaev-Zeldovich effect caused by hot electrons in the Local Supercluster (LSC) can explain the abnormal quadrupole and octopole of the cosmic microwave background (CMB) that were measured by WMAP and COBE. The…

天体物理学 · 物理学 2007-05-23 L. Raul Abramo , L. Sodre

We study the effect of global topology of the spatial geometry on the cosmic microwave background (CMB) for closed flat and closed hyperbolic models in which the spatial hypersurface is multiply connected. If the CMB temperature…

天体物理学 · 物理学 2013-09-06 Kaiki Taro Inoue

The "Cold Spot" in the CMB sky could be due to the presence of an anomalous huge spherical underdense region - a "Void" - of a few hundreds Mpc/h radius. Such a structure would have an impact on the CMB two-point (power spectrum) and…

宇宙学与河外天体物理 · 物理学 2010-07-02 Isabella Masina , Alessio Notari

The FIRAS data are independently recalibrated using the WMAP data to obtain a CMB temperature of 2.7260 +/- 0.0013. Measurements of the temperature of the cosmic microwave background are reviewed. The determination from the measurements…

宇宙学与河外天体物理 · 物理学 2014-11-20 D. J. Fixsen

Several intriguing phenomena, unlikely within the standard inflationary cosmology, were reported in the cosmic microwave background (CMB) data from WMAP and appear to be uncorrelated. Two of these phenomena, termed CMB anomalies, are…

宇宙学与河外天体物理 · 物理学 2009-12-30 Armando Bernui

Skewness of temperature fluctuations of the cosmic microwave background (CMB) produced by initially Gaussian adiabatic perturbations with the flat (Harrison-Zeldovich) spectrum, which arises due to non-linear corrections to a gravitational…

天体物理学 · 物理学 2009-10-28 Dipak Munshi , Tarun Souradeep , Alexei A. Starobinsky