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Effects of cosmological moduli fields on cosmic microwave background
Open accessAbstract
We discuss effects of cosmological moduli fields on the cosmic microwave background (CMB). If a modulus field φ once dominates the universe, the CMB we observe today is from the decay of φ and its anisotropy is affected by the primordial fluctuation in the amplitude of the modulus field. Consequently, constraints on the inflaton potential from the CMB anisotropy can be relaxed. In particular, the scale of the inflation may be significantly lowered. In addition, with the cosmological moduli fields, correlated mixture of adiabatic and isocurvature fluctuations may be generated, which results in enhanced CMB angular power spectrum at higher multipoles relative to that of lower ones. Such an enhancement can be an evidence of the cosmological moduli fields, and may be observed in future satellite experiments.
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“We now see that the metric is of the Kantowski-Sachs form (case 2 of [43]), a Bianchi type III homogeneous but anisotropic geometry.”
From Observable effects of anisotropic bubble nucleation (2010) · cites this paper as [43]
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Metadata
- Authors
- Moroi, T., & Takahashi, T.
- Affiliations
- Tohoku University (JP)
- Corresponding author
- Moroi, Takeo
- ORCID
- Takahashi, Tomo
- Venue
- Physics Letters B
- Publisher
- Elsevier BV
- Published
- 2001-12
- Volume
- 522
- Issue
- 3-4
- Pages
- 215-221
- ISSN
- 0370-2693 (ISSN-L)
- OpenAlex
- W2075454621
- Cited by
- 938
- References
- 0
- Citations by year
- 2026: 36 · 2025: 19 · 2024: 24 · 2023: 24 · 2022: 18 · 2021: 12 · 2020: 18 · 2019: 20 · 2018: 15 · 2017: 21 · 2016: 39 · 2015: 30 · 2014: 53 · 2013: 70 · 2012: 61
- FWCI
- 21.88
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Physics Letters B (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Ministry of Education, Culture, Sports, Science and Technology (12047201, 13740138)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Noncommutative and Quantum Gravity Theories
- Keywords
- cosmic microwave background anisotropies, primordial perturbations, CMB power spectrum, scalar field decay
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