Results 51 to 60 of about 256,877 (297)

Frequency–Redshift Relation of the Cosmic Microwave Background

Astronomy, 2023
We point out that a modified temperature–redshift relation (T-z relation) of the cosmic microwave background (CMB) cannot be deduced by any observational method that appeals to an a priori thermalisation to the CMB temperature T of the excited states in ...
Ralf Hofmann, Janning Meinert
doaj   +1 more source

Room for New Physics in the Rayleigh-Jeans Tail of the Cosmic Microwave Background. [PDF]

Physical Review Letters, 2018
We show that, despite stringent constraints on the shape of the main part of the cosmic microwave background (CMB) spectrum, there is considerable room for its modification within its Rayleigh-Jeans (RJ) end, ω≪T_{CMB}.
M. Pospelov, J. Pradler, J. Ruderman, A. Urbano   +3 more
semanticscholar   +1 more source

Effect of the field self-interaction of General Relativity on the Cosmic Microwave Background Anisotropies [PDF]

Class. Quantum Grav. 39 135003 (2022), 2022
Field self-interactions are at the origin of the non-linearities inherent to General Relativity. We study their effects on the Cosmic Microwave Background anisotropies. We find that they can reduce or alleviate the need for dark matter and dark energy in the description of the Cosmic Microwave Background power spectrum.
arxiv   +1 more source

Photonic Integrated Circuits for Microwave Astronomy

Inventions, 2023
One of the main objectives of cosmology is the measurement of the Cosmic Microwave Background (CMB) polarization and, in particular, the so-called B-modes, which could demonstrate the existence of the primordial gravitational waves generated at the early
Guillermo Pascual-Cisneros, Francisco J. Casas, Patricio Vielva   +2 more
doaj   +1 more source

Cosmic Needles versus Cosmic Microwave Background Radiation [PDF]

, 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   +2 more sources

A Measurement of the Cosmic Microwave Background Lensing Potential and Power Spectrum from 500 deg2 of SPTpol Temperature and Polarization Data [PDF]

Astrophysical Journal, 2019
We present a measurement of the cosmic microwave background lensing potential using 500 deg2 of 150 GHz data from the SPTpol receiver on the South Pole Telescope.
W. L. K. Wu, L. Mocanu, P. Ade, A. Anderson, J. Austermann, J. Avva, J. Beall, A. Bender, B. Benson, F. Bianchini, L. Bleem, J. Carlstrom, C. Chang, H. Chiang, R. Citron, C. C. Moran, T. Crawford, A. Crites, T. Haan, M. Dobbs, W. Everett, J. Gallicchio, E. George, A. Gilbert, Namit Gupta, N. Halverson, N. Harrington, J. Henning, G. Hilton, G. Holder, W. Holzapfel, Z. Hou, J. Hrubeš, N. Huang, J. Hubmayr, K. Irwin, L. Knox, A. Lee, D. Li, A. Lowitz, A. Manzotti, J. McMahon, S. Meyer, M. Millea, J. Montgomery, A. Nadolski, T. Natoli, J. Nibarger, G. Noble, V. Novosad, Y. Omori, S. Padin, S. Patil, C. Pryke, C. Reichardt, J. Ruhl, B. Saliwanchik, J. Sayre, K. Schaffer, C. Sievers, G. Simard, G. Smecher, A. Stark, K. Story, C. Tucker, K. Vanderlinde, T. Veach, J. Vieira, G. Wang, N. Whitehorn, V. Yefremenko   +70 more
semanticscholar   +1 more source

Clustering of hotspots in the cosmic microwave background [PDF]

EPJ Web of Conferences, 2019
The physics behind the origin and composition of the Cosmic Microwave Background (CMB) is a well-established topic in the field of Cosmology. Literature on CMB anisotropies reveal consistency with Gaussianity [1], but these were conducted on full multi ...
Low En Zuo Joel, Yang Abel
doaj   +1 more source

Measurements of B -mode polarization of the cosmic microwave background from 500 square degrees of SPTpol data [PDF]

Physical Review D, 2019
We report a B-mode power spectrum measurement from the cosmic microwave background (CMB) polarization anisotropy observations made using the SPTpol instrument on the South Pole Telescope.
J. Sayre, J. Sayre, C. Reichardt, J. Henning, P. Ade, A. Anderson, J. Austermann, J. Austermann, J. Avva, J. Beall, A. Bender, B. Benson, B. Benson, F. Bianchini, L. Bleem, J. Carlstrom, C. Chang, C. Chang, P. Chaubal, H. Chiang, H. Chiang, R. Citron, C. C. Moran, T. Crawford, A. Crites, A. Crites, T. Haan, T. Haan, M. Dobbs, M. Dobbs, W. Everett, J. Gallicchio, E. George, E. George, A. Gilbert, N. Gupta, N. Halverson, N. Harrington, G. Hilton, G. Holder, G. Holder, W. Holzapfel, J. Hrubeš, Norden E. Huang, J. Hubmayr, K. Irwin, L. Knox, Adrian T. Lee, Adrian T. Lee, Dale Li, Dale Li, A. Lowitz, J. McMahon, S. Meyer, L. Mocanu, J. Montgomery, A. Nadolski, T. Natoli, T. Natoli, J. Nibarger, G. Noble, V. Novosad, S. Padin, S. Padin, S. Patil, C. Pryke, J. Ruhl, B. Saliwanchik, B. Saliwanchik, K. Schaffer, K. Schaffer, C. Sievers, G. Smecher, A. Stark, C. Tucker, K. Vanderlinde, T. Veach, J. Vieira, Gensheng Wang, N. Whitehorn, W. L. K. Wu, V. Yefremenko   +81 more
semanticscholar   +1 more source

CMB anomalies and the effects of local features of the inflaton potential

European Physical Journal C: Particles and Fields, 2017
Recent analysis of the WMAP and Planck data have shown the presence of a dip and a bump in the spectrum of primordial perturbations at the scales $$k=0.002$$ k = 0.002 Mpc $${}^{-1}$$ - 1 and $$k=0.0035$$ k = 0.0035 Mpc $${}^{-1}$$ - 1 , respectively. We
Alexander Gallego Cadavid, Antonio Enea Romano, Stefano Gariazzo   +2 more
doaj   +1 more source

Comparing Cosmic Microwave Background Datasets [PDF]

, 1998
To extract reliable cosmic parameters from cosmic microwave background datasets, it is essential to show that the data are not contaminated by residual non-cosmological signals. We describe general statistical approaches to this problem, with an emphasis
A. de Oliveira-Costa, A. H. Jaffe, A. Kogut, B. Draine, C. A. Inman, C. B. Netterfield, C. H. Lineweaver, D. Charbonneau, D. J. Fixsen, D. J. Fixsen, E. J. Wollack, E. S. Cheng, E. S. Cheng, E. S. Cheng, G. Jungman, G. Jungman, J. E. Ruhl, J. Mather, J. R. Bond, J. R. Bond, J. R. Bond, J. R. Bond, K. Ganga, L. Knox, L. Knox, M. Segal, M. Tegmark, P. C. Gregory, Readhead, S. R. Platt, T. N. I. Gautier   +30 more
core   +2 more sources