Is the Cosmic Transparency Spatially Homogeneous?

Abstract

We study the constraints on the cosmic opacity using the latest BAO and Union2 SNIa data in this paper and find that the best fit values seem to indicate that an opaque universe is preferred in redshift regions $0.20-0.35$, $0.35-0.44$ and $0.60-0.73$, whereas, a transparent universe is favored in redshift regions $0.106-0.20$, $0.44-0.57$and $0.57-0.60$. However, our result is still consistent with a transparent universe at the 1$\sigma$ confidence level, even though the best-fit cosmic opacity oscillates between zero and some nonzero values as the redshift varies.

10 pages, 1 figure. Accepted for publication in JCAP on Sept. 26

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Cited by in corpus (13)

• Is the Universe Transparent?
• Model-independent Constraints on Cosmic Curvature and Opacity
• Cosmic opacity: cosmological-model-independent tests from gravitational waves and Type Ia Supernova
• Cosmic opacity: cosmological-model-independent tests and their impacts on cosmic acceleration
• Probing the cosmic opacity from Future Gravitational Wave Standard Sirens
• Violation of the FRW consistency condition as a signature of backreaction
• Model-independent test for the cosmic distance duality relation with Pantheon and eBOSS DR16 quasar sample
• Testing the cosmic opacity at higher redshifts: implication from quasars with available UV and X-ray observations
• Gravitational-wave constraints on the cosmic opacity at $z\sim 5$: forecast from space gravitational-wave antenna DECIGO
• Unbiased Cosmic Opacity Constraints from Standard Sirens and Candles
• Testing distance duality with CMB anisotropies
• Testing the cosmic conservation of photon number with type Ia supernovae and ages of old objects
• Exploring the potentiality of standard sirens to probe cosmic opacity at high redshifts