Ghost Condensation and a Consistent IR Modification of Gravity
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Ghost condensation model adds a scalar ghost field but theory is kept stable because terms push kinetic terms to fixed condensation value avoiding instability; theory has spontaneous breaking of Lorentz invariance.
“Another interesting scalar–tensor theory is the ghost condensation model as proposed by Hamed et al. (2004). A scalar ghost field is added but the theory is kept stable because the terms in the action push the kinetic terms to a fixed condensation value avoiding instability. The theory has spontaneous breaking of Lorentz invariance.”
From Testing general relativity in cosmology (2019) · cites this paper as Hamed et al. 2004
In ghost condensation, gravitational fields propagating through ghost condensate scalar field acquire a mass just like particles acquire mass through Higgs field.
“That is gravitational fields propagating through the ghost condensate scalar field acquire a mass just like particles acquire mass while propagating through the Higgs field.”
From Testing general relativity in cosmology (2019) · cites this paper as Hamed et al. 2004
Ghost condensate field fills space and is equivalent to a fluid with equation of state w=-1, thus can drive observed cosmic acceleration.
“The ghost condensate field fills space in the universe and is equivalent to a fluid with the same equation of state, , as a cosmological constant, and thus can drive the observed cosmic acceleration.”
From Testing general relativity in cosmology (2019) · cites this paper as Hamed et al. 2004
Most frameworks explicitly break Lorentz invariance, with a preferred set of observers or background field other than the metric.
“Most frameworks explicitly break Lorentz invariance, in that there is a preferred set of observers or background field other than the metric [90, 34].”
From Modern Tests of Lorentz Invariance (2005) · cites this paper as [34]
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- Authors
- Hamed, N. A., Cheng, H. S., Luty, M. A., & Mukohyama, S.
- Affiliations
- Harvard University (US)
- Boston University (US)
- ORCID
- Luty, M.A
- Venue
- Journal of High Energy Physics
- Published
- 2004-05-29
- Volume
- 2004
- Issue
- 05
- Pages
- 074-074
- ISSN
- 1029-8479 (ISSN-L)
- OpenAlex
- W2004840376
- Cited by
- 996
- References
- 38
- Citations by year
- 2026: 20 · 2025: 38 · 2024: 48 · 2023: 35 · 2022: 30 · 2021: 45 · 2020: 33 · 2019: 32 · 2018: 34 · 2017: 30 · 2016: 60 · 2015: 45 · 2014: 53 · 2013: 54 · 2012: 47
- FWCI
- 35.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of High Energy Physics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (0201124, 0244821)
- Aspen Center for 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
- ghost condensation, modified gravity, de Sitter expansion, effective field theory, Lorentz violation, spin-dependent forces, modified Newtonian potential, antigravity, dark energy, dark matter, inflation (cosmology)
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