Journal
MODERN PHYSICS LETTERS A
Volume 31, Issue 21, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732316400034
Keywords
Broken rotational invariance; cosmic microwave background; non-Gaussianity; parity violation
Categories
Funding
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- [27-10917]
- Grants-in-Aid for Scientific Research [15J10917] Funding Source: KAKEN
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There are possibilities to violate symmetries (e.g. parity and rotational invariance) in the primordial cosmological fluctuations. Such symmetry breakings can imprint very rich signatures in late-time phenomena, which may be possible to observe. Especially, Cosmic Microwave Background (CMB) will change its face drastically, corresponding to the symmetry-breaking types, since the harmonic-space representation is very sensitive to the statistical, spin and angular dependences of cosmological perturbations. Here, we discuss (1) general responses of CMB to the symmetry breakings, (2) some theoretical models creating interesting CMB signatures, and (3) aspects of the estimation from observational data.
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