Bouncing Galileon cosmologies
Open accessAbstract
We present nonsingular, homogeneous and isotropic bouncing solutions of the conformal Galileon model. We show that such solutions necessarily begin with a radiation-dominated contracting phase. This is followed by a quintom scenario in which the background equation of state crosses the cosmological constant boundary allowing for a nonsingular bounce which in turn is followed by Galilean Genesis. We analyze the spectrum of cosmological perturbations in this background. Our results show that the fluctuations evolve smoothly and without any pathology, but the adiabatic modes form a blue tilted spectrum. In order to achieve a scale-invariant primordial power spectrum as required by current observations, we introduce a light scalar field coupling to the Galileon kinetically. We find two couplings which yield a scale-invariant spectrum, one of which requires a fine tuning of the initial conditions. This model also predicts a blue tilted spectrum of gravitational waves stemming from quantum vacuum fluctuations in the contracting phase.
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Galileon fields have been used to construct monsters of the type discussed above, including loitering, inflationary and bouncing cosmologies [37,40-44] and other exotic cosmological solutions [45-47].
“Because of their ability to violate the NEC, Galileon fields have been used to construct monsters of the type discussed above, including loitering, inflationary and bouncing cosmologies [37,40 -44] and other exotic cosmological solutions [45 -47].”
From Past-completeness of inflationary spacetimes (2023) · cites this paper as [42]
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References 109 · Cited by 206
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- Authors
- Qiu, T., Evslin, J., Cai, Y.-F., Li, M., & Zhang, X.
- Affiliations
- Chung Yuan Christian University (TW)
- Chinese Academy of Sciences (CN)
- Nanjing University (CN)
- ORCID
- Evslin, Jarah
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2011-10-26
- Volume
- 2011
- Issue
- 10
- Pages
- 036-036
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2092553957
- Cited by
- 206
- References
- 109
- Citations by year
- 2026: 5 · 2025: 9 · 2024: 12 · 2023: 8 · 2022: 5 · 2021: 14 · 2020: 9 · 2019: 11 · 2018: 14 · 2017: 17 · 2016: 28 · 2015: 20 · 2014: 18 · 2013: 16 · 2012: 17
- FWCI
- 9.17
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Cosmology and Astroparticle Physics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Arizona State University
- National Center for Theoretical Sciences
- National Natural Science Foundation of China (10675136, 10821063, 11075074, KJCX3-SYW-N2, 10533010, 11065004)
- National Science Council (NSC99)
- Chinese Academy of Sciences (10675136, KJCX3-SYW-N2, 2010Y2JA01, 10533010, 2007CB815401)
- National Key Research and Development Program of China (2007CB815401, 10821063)
- Specialized Research Fund for the Doctoral Program of Higher Education of China
- High Energy Physics
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Black Holes and Theoretical Physics
- Keywords
- non-singular bounce, bounce cosmology, quintom, cosmological perturbations, blue-tilted spectrum, gravitational waves, vacuum fluctuations, contracting phase, initial conditions
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