Probing early-universe phase transitions with CMB spectral distortions
نویسندگان
چکیده
منابع مشابه
The CMB spectrum: Perspective of observing spectral distortions
Spectral distortions (deviations from a Planck distribution) of the cosmic microwave background (CMB) are potential sources of information on the thermal history of the Universe. So far however they escaped detection. We suggest a different observational approach useful to discover Bose–Einstein distortions. ! 2006 Elsevier B.V. All rights reserved. PACS: 03.09.05; 03.19.1; 12.03.1
متن کاملSpectral distortions to the Cosmic Microwave Background from the recombination of hydrogen and helium
The recombination of hydrogen and helium at z∼ 1000–7000 gives unavoidable distortions to the Cosmic Microwave Background (CMB) spectrum. We present a detailed calculation of the line intensities arising from the Lyα (2p–1s) and two-photon (2s–1s) transitions for the recombination of hydrogen, as well as the corresponding lines from helium. We give an approximate formula for the strength of the...
متن کاملNon-Gaussian signatures from the postinflationary early universe.
We consider contributions to non-Gaussianity of the cosmic microwave background (CMB) from remnants of phase transitions in the very early Universe. Such signatures can optimistically be used to discover evidence of new particle physics through cosmological observations. More conservatively they may provide an obstacle to extracting information about the non-Gaussian nature of primordial densit...
متن کاملCMB spectral distortions from small-scale isocurvature fluctuations
The damping of primordial perturbations at small scales gives rise to distortions of the cosmic microwave background (CMB). Here, the dependence of the distortion on the different types of cosmological initial conditions is explored, covering adiabatic, baryon/cold dark matter isocurvature, neutrino density/velocity isocurvature modes and some mixtures. The radiation transfer functions for each...
متن کاملCosmological Recombination
In this thesis we focus on studying the physics of cosmological recombination and how the details of recombination affect the Cosmic Microwave Background (CMB) anisotropies. We present a detailed calculation of the spectral line distortions on the CMB spectrum arising from the Lyα and two-photon transitions in the recombination of hydrogen (H), as well as the corresponding lines from helium (He...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017