What is the Cosmic Microwave Background and what does it tell us about the initial conditions of the universe?
DOI:
https://doi.org/10.58445/yg2esy93Keywords:
Cosmic Microwave Background (CMB), Cosmic Inflation, Early Universe CosmologyAbstract
The aim of this paper is to look at the early Universe, using the theory of cosmic inflation and observations of the Cosmic Microwave Background (CMB). Inflation is a short but very rapid expansion that resolves many of the problems associated with the Universe, such as the uniformity on its large scales, the near-flatness and the absence of the magnetic monopoles predicted by theories of physics. The CMB, formed about 380,000 years after the big bang, carries the imprint of the physics of the early Universe in the form of its temperature anisotropies and polarization patterns. This paper covers the CMB blackbody spectrum, temperature fluctuations, density perturbations, power spectrum and E-mode and B-mode polarization. Particular focus is placed on primordial B-modes, which would be strong evidence for gravitational waves produced by inflation.
References
Guth, Alan H. "Inflationary Universe: A Possible Solution to the Horizon and Flatness Problems." Physical Review D, vol. 23, no. 2, Jan. 1981, pp. 347–56. 10.1103/PhysRevD.23.347.
Planck Collaboration. "Planck 2018 Results. I. Overview and the Cosmological Legacy of Planck." Astronomy & Astrophysics, vol. 641, 2020, art. A1. 10.1051/0004-6361/201833880.
Stark, Daniel P. "Galaxies in the First Billion Years After the Big Bang." arXiv preprint, arXiv:1601.07556, 2016.10.48550/arXiv.1601.07556.
Saunders, Simon. "Inflation." Philosophy of Cosmology, University of Oxford, arXiv:1408.0694, 2014. 10.48550/arXiv.1408.0694.
Fixsen, D. J. "The Temperature of the Cosmic Microwave Background." The Astrophysical Journal, vol. 707, no. 2, 2009, pp. 916–20. 10.1088/0004-637X/707/2/916.
Borde, Arvind, Alan H. Guth, and Alexander Vilenkin. "Inflationary Spacetimes Are Incomplete in Past Directions." Physical Review Letters, vol. 90, no. 15, 2003, art. 151301. 10.1103/PhysRevLett.90.151301.
Linde, Andrei D. "Inflation." Physics Reports, vol. 190, no. 6, 1990, pp. 307–403. 10.1016/0370-1573(90)90144-Q.
Hu, Wayne, and Scott Dodelson. "Cosmic Microwave Background Anisotropies." arXiv preprint, arXiv:astro-ph/0110414, 2001. 10.48550/arXiv.astro-ph/0110414.
Peebles, P. J. E., et al. "The Case for the Relativistic Hot Big Bang Cosmology." Nature, vol. 352, 1991, pp. 769–76. 10.1038/352769a0.
Bardeen, J. M., J. R. Bond, N. Kaiser, and A. S. Szalay. "The Statistics of Peaks of Gaussian Random Fields." The Astrophysical Journal, vol. 304, 1986, pp. 15–61. 10.1086/164143.
Planck Collaboration. "Planck 2018 Results. VI. Cosmological Parameters." Astronomy & Astrophysics, vol. 641, 2020, art. A6. 10.1051/0004-6361/201833910.
Planck Collaboration. "Planck 2018 Results. VII. Isotropy and Statistics of the CMB." Astronomy & Astrophysics, vol. 641, 2020, art. A7. 10.1051/0004-6361/201935201.
Lyth, David H., and Antonio Riotto. "Particle Physics Models of Inflation and the Cosmological Density Perturbation." Physics Reports, vol. 314, nos. 1–2, 1999, pp. 1–146. 10.1016/S0370-1573(98)00128-8.
Gawiser, Eric, and Joseph Silk. "The Cosmic Microwave Background Radiation." Physics Reports, vols. 333–334, 2000, pp. 245–67. 10.1016/S0370-1573(00)00025-9.
Kamionkowski, Marc, Arthur Kosowsky, and Albert Stebbins. "A Probe of Primordial Gravity Waves and Vorticity." Physical Review Letters, vol. 78, no. 11, 1997, pp. 2058–61. 10.1103/PhysRevLett.78.2058.
Ade, P. A. R., et al. "Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum with the POLARBEAR Experiment." Physical Review Letters, vol. 113, no. 2, 2014, art. 021301. 10.1103/PhysRevLett.113.021301.
Zaldarriaga, Matias, and Uroš Seljak. "All-Sky Analysis of Polarization in the Microwave Background." Physical Review D, vol. 55, no. 4, 1997, pp. 1830–40. 10.1103/PhysRevD.55.1830.
Ade, P., et al. "The Simons Observatory: Science Goals and Forecasts." Journal of Cosmology and Astroparticle Physics, no. 02, 2019, art. 056. 10.1088/1475-7516/2019/02/056.
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