The Cosmological Constant

Carroll, Sean M.; Press, William H.; Turner, Edwin L.

doi:10.1146/annurev.aa.30.090192.002435

Cited by 1,501 publications

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“…The apparent brightness of the Type Ia supernova standard candle with redshift is given [32] by a simple relation for a flat Λ = 0 cosmology. The luminosity distance becomes,…”

Section: Resultsmentioning

confidence: 99%

Bulk viscosity, decaying dark matter, and the cosmic acceleration

2007

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We discuss a cosmology in which cold dark-matter particles decay into relativistic particles. We argue that such decays could lead naturally to a bulk viscosity in the cosmic fluid. For decay lifetimes comparable to the present hubble age, this bulk viscosity enters the cosmic energy equation as an effective negative pressure. We investigate whether this negative pressure is of sufficient magnitude to account fo the observed cosmic acceleration. We show that a single decaying species in a Λ = 0, flat, dark-matter dominated cosmology can not reproduce the observed magnituderedshift relation from Type Ia supernovae. However, a delayed bulk viscosity, possibly due to a cascade of decaying particles may be able to account for a significant fraction of the apparent cosmic acceleration. Possible candidate nonrelativistic particles for this scenario include sterile neutrinos or gauge-mediated decaying supersymmetric particles.PACS numbers: 98.80. Cq, 95.30.Cq, 95.35.+d, 95.36.+x, 98.80.Es, 98.62.Py

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“…The apparent brightness of the Type Ia supernova standard candle with redshift is given [32] by a simple relation for a flat Λ = 0 cosmology. The luminosity distance becomes,…”

Section: Resultsmentioning

confidence: 99%

Bulk viscosity, decaying dark matter, and the cosmic acceleration

2007

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“…Carroll et al 1992). The angular radius r θ is computed in the same way for the four group samples considering just the galaxies with |∆v l−o−s |≤10 3 km s −1 in each group.…”

Section: Selection Of Galaxy Group Candidates and Sfcg Cataloguementioning

confidence: 99%

Star-forming compact groups (SFCGs): an ultraviolet search for a local sample

Hernández-Fernández

Oliveira

2015

Mon. Not. R. Astron. Soc.

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We present a local sample (z<0.15) of 280 Star-Forming Compact Groups (SFCGs) of galaxies identified in the ultraviolet Galaxy Evolution EXplorer (GALEX) All-sky Imaging Survey (AIS). So far, just one prototypical example of SFCG, the Blue Infalling Group, has been studied in detail in the Local Universe. The sample of SFCGs is mainly the result of applying a Friendsof-Friends group finder in the space of celestial coordinates with a maximum linking-length of 1.5 arcmin and choosing groups with a minimum number of four members of bright UV-emitting 17

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“…where the function sinn(x) is defined as sinh(x) for Ω k > 0, sinn(x) = x for Ω k = 0, and sinn(x) = sin(x) for Ω k < 0, while Ω k = 1 − Ω M − Ω Λ (Carroll et al 1992).…”

Section: Measurement Of the Hubble Constantmentioning

confidence: 99%

Measurement of the cosmological distance scale using X-ray and Sunyaev–Zel'dovich effect observations of galaxy clusters

et al. 2012

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Abstract. X-ray and Sunyaev-Zeldovich effect (SZE) observations of galaxy clusters can be used to measure their distances independently of the cosmic distance ladder. We have determined the distance to 38 clusters of galaxies in the redshift range 0.14 z 0.89 using X-ray data from the Chandra X-ray Observatory and SZE data from the Owens Valley Radio Observatory and the Berkeley-Illinois-Maryland Association interferometric arrays. We measure a Hubble constant of H 0 = 76.9 + 3. 9

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The Cosmological Constant

Cited by 1,501 publications

References 0 publications

Bulk viscosity, decaying dark matter, and the cosmic acceleration

Bulk viscosity, decaying dark matter, and the cosmic acceleration

Star-forming compact groups (SFCGs): an ultraviolet search for a local sample

Measurement of the cosmological distance scale using X-ray and Sunyaev–Zel'dovich effect observations of galaxy clusters

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