scholarly journals Question of measuring spatial curvature in an inhomogeneous universe

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
Chi Tian ◽  
Stefano Anselmi ◽  
Matthew F. Carney ◽  
John T. Giblin ◽  
James Mertens ◽  
...  
Keyword(s):  
Spatial Curvature ◽  
Inhomogeneous Universe

Generating spatial curvature in an inhomogeneous universe: A bottom-up approach to cosmology

2010 ◽  
Vol 57 (3(1)) ◽  
pp. 586-590
Author(s):  
Kjell Rosquist ◽  
Lars Samuelsson
Keyword(s):  
Spatial Curvature ◽  
Bottom Up ◽  
Inhomogeneous Universe

scholarly journals GRAVITATIONAL ENERGY AND COSMIC ACCELERATION

2008 ◽  
Vol 17 (03n04) ◽  
pp. 641-649 ◽  
Author(s):  
DAVID L. WILTSHIRE
Keyword(s):  
Acoustic Oscillation ◽  
Gravitational Energy ◽  
Cosmic Acceleration ◽  
Spatial Curvature ◽  
Apparent Effect ◽  
Inhomogeneous Universe ◽  
Angular Scale ◽  
Apparent Homogeneity ◽  
Expansion Of The Universe ◽  
The Universe

Cosmic acceleration is explained quantitatively, as an apparent effect due to gravitational energy differences that arise in the decoupling of bound systems from the global expansion of the universe. "Dark energy" is a misidentification of those aspects of gravitational energy which by virtue of the equivalence principle cannot be localized, namely gradients in the energy due to the expansion of space and spatial curvature variations in an inhomogeneous universe. A new scheme for cosmological averaging is proposed which solves the Sandage – de Vaucouleurs paradox. Concordance parameters fit supernova luminosity distances, the angular scale of the sound horizon in the CMB anisotropies, and the effective comoving baryon acoustic oscillation scale seen in galaxy clustering statistics. Key observational anomalies are potentially resolved, and unique predictions made, including a quantifiable variance in the Hubble flow below the scale of apparent homogeneity.

scholarly journals Light path averages in spacetimes with nonvanishing average spatial curvature

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
S. M. Koksbang
Keyword(s):  
Light Path ◽  
Spatial Curvature

scholarly journals Some Anisotropic Universes in the Presence of Imperfect Fluid Coupling with Spatial Curvature

2011 ◽  
Vol 50 (6) ◽  
pp. 1962-1977 ◽  
Author(s):  
Özgür Akarsu ◽  
Can Battal Kılınç
Keyword(s):  
Spatial Curvature ◽  
Imperfect Fluid ◽  
Fluid Coupling

scholarly journals The local value ofH0in an inhomogeneous universe

2016 ◽  
Vol 2016 (02) ◽  
pp. 001-001 ◽  
Author(s):  
I. Odderskov ◽  
S.M. Koksbang ◽  
S. Hannestad
Keyword(s):  
Inhomogeneous Universe ◽  
Local Value

scholarly journals DARK MATTER, AND ITS DARKNESS

2006 ◽  
Vol 15 (12) ◽  
pp. 2267-2278 ◽  
Author(s):  
D. V. AHLUWALIA-KHALILOVA
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Cosmological Constant ◽  
Model Material ◽  
Representation Space ◽  
Spatial Curvature ◽  
The Standard Model ◽  
General Relativistic ◽  
Relativistic Description ◽  
Friedmann Robertson Walker

Assuming the validity of the general relativistic description of gravitation on astrophysical and cosmological length scales, we analytically infer that the Friedmann–Robertson–Walker cosmology with Einsteinian cosmological constant, and a vanishing spatial curvature constant, unambiguously requires a significant amount of dark matter. This requirement is consistent with other indications for dark matter. The same space–time symmetries that underlie the freely falling frames of Einsteinian gravity also provide symmetries which, for the spin one half representation space, furnish a novel construct that carries extremely limited interactions with respect to the terrestrial detectors made of the standard model material. Both the "luminous" and "dark" matter turn out to be residents of the same representation space but they derive their respective "luminosity" and "darkness" from either belonging to the sector with (CPT)2 = +𝟙, or to the sector with (CPT)2 = -𝟙.

scholarly journals Model-independent constraints on cosmic curvature: implication from the future space gravitational-wave antenna DECIGO

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Xiaogang Zheng ◽  
Shuo Cao ◽  
Yuting Liu ◽  
Marek Biesiada ◽  
Tonghua Liu ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Future Generation ◽  
Spatial Curvature ◽  
Hubble Diagram ◽  
Einstein Telescope ◽  
Future Space ◽  
Local Measurements ◽  
New Type ◽  
Model Independent ◽  
Hubble Parameters

AbstractIn order to estimate cosmic curvature from cosmological probes like standard candles, one has to measure the luminosity distance $$D_L(z)$$ D L ( z ) , its derivative with respect to redshift $$D'_L(z)$$ D L ′ ( z ) and the expansion rate H(z) at the same redshift. In this paper, we study how such idea could be implemented with future generation of space-based DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO), in combination with cosmic chronometers providing cosmology-independent H(z) data. Our results show that for the Hubble diagram of simulated DECIGO data acting as a new type of standard siren, it would be able to constrain cosmic curvature with the precision of $$\varDelta \varOmega _k= 0.09$$ Δ Ω k = 0.09 with the currently available sample of 31 measurements of Hubble parameters. In the framework of the third generation ground-based gravitational wave detectors, the spatial curvature is constrained to be $$\varDelta \varOmega _k= 0.13$$ Δ Ω k = 0.13 for Einstein Telescope (ET). More interestingly, compared to other approaches aiming for model-independent estimations of spatial curvature, our analysis also achieve the reconstruction of the evolution of $$\varOmega _k(z)$$ Ω k ( z ) , in the framework of a model-independent method of Gaussian processes (GP) without assuming a specific form. Therefore, one can expect that the newly emerged gravitational wave astronomy can become useful in local measurements of cosmic curvature using distant sources.

scholarly journals Spatial curvature sensitivity to local H0 from the Cepheid distance ladder

2022 ◽  
Vol 33 ◽  
pp. 10-13
Author(s):  
Ella Zuckerman ◽  
Luis A. Anchordoqui
Keyword(s):  
Spatial Curvature

The Inhomogeneous Universe

2017 ◽  
pp. 187-207
Author(s):  
Bernard J. T. Jones
Keyword(s):  
Inhomogeneous Universe

scholarly journals Using Spatial Curvature with H ii Galaxies and Cosmic Chronometers to Explore the Tension in H 0

2019 ◽  
Vol 881 (2) ◽  
pp. 137 ◽  
Author(s):  
Cheng-Zong Ruan ◽  
Fulvio Melia ◽  
Yu Chen ◽  
Tong-Jie Zhang
Keyword(s):  
Spatial Curvature
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