Results 1 to 10 of about 78,324 (222)

Revisiting cosmic microwave background radiation using blackbody radiation inversion. [PDF]

Sci Rep, 2021
AbstractBlackbody radiation inversion is a mathematical process for the determination of probability distribution of temperature from measured radiated power spectrum. In this paper a simple and stable blackbody radiation inversion is achieved by using an analytical function with three determinable parameters for temperature distribution.
Konar K, Bose K, Paul RK.
europepmc   +7 more sources

Testing Isotropy of Cosmic Microwave Background Radiation [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
We introduce new symmetry-based methods to test for isotropy in cosmic microwave background radiation. Each angular multipole is factored into unique products of power eigenvectors, related multipoles and singular values that provide 2 new rotationally ...
Jain, Pankaj, Ralston, John P., Saha, Rajib, Samal, Pramoda Kumar   +3 more
core   +10 more sources

Cosmic Needles versus Cosmic Microwave Background Radiation [PDF]

The Astrophysical Journal, 2002
It has been suggested by a number of authors that the 2.7K cosmic microwave background (CMB) radiation might have arisen from the radiation from Population III objects thermalized by conducting cosmic graphite/iron needle-shaped dust.
Aguirre A. N., Aigen Li, Chlewicki G., Greenberg J. M., Hoyle F., Hoyle F., Lind A. C., Moravec T. J., Narlikar J. V., Ordal M. A., Rana N. C., Sivaram C., Wickramasinghe N. C., Wickramasinghe N. C., Wickramasinghe N. C., Wickramasinghe N. C., Wickramasinghe N. C.   +16 more
core   +7 more sources

Long range correlation in cosmic microwave background radiation [PDF]

Physical Review E, 2011
We investigate the statistical anisotropy and Gaussianity of temperature fluctuations of Cosmic Microwave Background radiation (CMB) data from {\it Wilkinson Microwave Anisotropy Probe} survey, using the multifractal detrended fluctuation analysis ...
C. L. Alados, D. Novikov, F. Bernardeau, F. Ghasemi, H. E. Hurst, H. O. Peitgen, J. A. Peacock, J. Feder, J. M. Hausdorff, J. R. Bond, K. Schwarzschild, M. Reza Rahimi Tabar, M. Sadegh Movahed, P. Coles, R. N. Mantegna, Sohrab Rahvar, T. Fukushige, V. F. Mukhanov   +17 more
core   +5 more sources

The cosmic microwave background radiation temperature at z = 3.025 toward QSO 0347--3819 [PDF]

, 2001
From the analysis of the CII fine-structure population ratio in the damped Ly_alpha system at z = 3.025 toward the quasar Q0347--3819 we derive an upper bound of 14.6 (+/- 0.2) K on the cosmic microwave background temperature regardless the presence of ...
Bahcall, D'Odorico, Ge, Grevesse, Launay, Lima, Lu, M. Dessauges-Zavadsky, Mather, Mathis, Meyer, P. Molaro, Prochaska, Roth, S. A. Levshakov, S. D'Odorico, Silva, Sofia, Songaila, Srianand, Varshalovich, Wright   +21 more
core   +6 more sources

Imprints of Relic Gravitational Waves in Cosmic Microwave Background Radiation [PDF]

, 2006
A strong variable gravitational field of the very early Universe inevitably generates relic gravitational waves by amplifying their zero-point quantum oscillations.
A. G. Polnarev, A. G. Polnarev, A. N. Varshalovich, B. G. Keating, D. Baskaran, L. P. Grishchuk, L. D. Landau, L. P. Grishchuk, L. P. Grishchuk, L. P. Grishchuk, L. P. Grishchuk, L. P. Grishchuk, L. P. Grishchuk, L. P. Grishchuk, L. P. Grishchuk, M. M. Basko, N. Kaiser, P. D. Naselskii, P. J. E. Peebles, R. A. Frewin, S. Chandrasekhar, V. N. Lukash, Ya. B. Zel’dovich, Ya. B. Zel’dovich   +23 more
core   +6 more sources

Cosmic Microwave Background Radiation Anisotropy Induced by Cosmic Strings

, 1994
We report on a current investigation of the anisotropy pattern induced by cosmic strings on the cosmic microwave background radiation (MBR). We have numerically evolved a network of cosmic strings from a redshift of $Z = 100$ to the present and ...
Allen, B., Caldwell, R. R., Shellard, E. P. S., Stebbins, A., Veeraraghavan, S.   +4 more
core   +6 more sources

A flat Universe from high-resolution maps of the cosmic microwave background radiation [PDF]

Nature, 2000
The blackbody radiation left over from the Big Bang has been transformed by the expansion of the Universe into the nearly isotropic 2.73 K cosmic microwave background.
P. de Bernardis, P. A. R. Ade, J. J. Bock, J. R. Bond, J. Borrill, A. Boscaleri, K. Coble, B. P. Crill, G. de Gasperis, P. Farese, Pedro G. Ferreira, K. Ganga, M. Giacometti, E. Hivon, V. V. Hristov, A. Iacoangeli, A. H. Jaffe, A. E. Lange, L. Martinis, S. Masi, P. Mason, P. Mauskopf, A. Melchiorri, Leo Miglio, T. E. Montroy, C. B. Netterfield, E. Pascale, F. Piacentini, D. Pogosyan, S. Prunet, Sandhya M. Rao, G. Romeo, J. E. Ruhl, F. Scaramuzzi, D. Sforna, N. Vittorio   +35 more
openalex   +2 more sources

Joint Cosmic Microwave Background and Big Bang Nucleosynthesis Constraints on Light Dark Sectors with Dark Radiation [PDF]

Physical Review Letters, 2022
Dark sectors provide a compelling theoretical framework for thermally producing sub-GeV dark matter, and motivate an expansive new accelerator and direct-detection experimental program. We demonstrate the power of constraining such dark sectors using the
Cara Giovanetti, Mariangela Lisanti, Hongwan Liu, Joshua T. Ruderman   +3 more
openalex   +3 more sources

The cosmic microwave background radiation temperature at a redshift of 2.34 [PDF]

Nature, 2000
The existence of the cosmic microwave background radiation is a fundamental prediction of hot Big Bang cosmology, and its temperature should increase with increasing redshift. At the present time (redshift z = 0), the temperature has been determined with
R. Srianand, P. Petitjean, C. Ledoux
openalex   +3 more sources