Journal
PHYSICAL REVIEW D
Volume 101, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.101.024050
Keywords
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Funding
- Ratchadapisek Sompoch Endowment Fund, Chulalongkorn University [Sci-Super 2014-032]
- Ratchadapisek Somphot Fund at Chulalongkorn University
- Thailand Research Fund
- Office of the Higher Education Commission, Faculty of Science, Chulalongkorn University [RSA5980038]
- Royal Government of Thailand
- Development and Promotion of Science and Technology talent project
- Victoria University of Wellington
- Marsden Fund
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Normally one thinks of the observed cosmological constant as being so small that it can be utterly neglected on typical astrophysical scales, only affecting extremely large-scale cosmology at gigaparsec scales. Indeed, in those situations where the cosmological constant only has a quantitative influence on the physics, a separation of scales argument guarantees the effect is indeed negligible. The exception to this argument arises when the presence of a cosmological constant qualitatively changes the physics. One example of this phenomenon is the existence of outermost stable circular orbits (OSCOs) in the presence of a positive cosmological constant. Remarkably the size of these OSCOs is of a magnitude to be astrophysically interesting. For instance, for galactic masses the OSCOs are of order the intergalactic spacing; for galaxy cluster masses the OSCOs are of order the size of the cluster.
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