Geocentrism reexamined

Goodman, Jeremy

doi:10.1103/physrevd.52.1821

Cited by 100 publications

(123 citation statements)

References 39 publications

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“…[455] for time-drift-based consistency relations. Other tests are based on probes like the Sunyaev Zel'dovich effect [444] or strong lensing [442], which involve light scattered from inside the past lightcone and therefore can break at least some geometric degeneracies.…”

Section: Model-independent Tests Of λCdm Discussion Session Chairs: Ementioning

confidence: 99%

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BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

444

210

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Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, ΛCDM. This is motivated by a range of apparently serious theoretical issues, involving such questions as the cosmological constant problem, the particle nature of dark matter, the validity of general relativity on large scales, the existence of anomalies in the CMB and on small scales, and the predictivity and testability of the inflationary paradigm. In this paper, we summarize the current status of ΛCDM as a physical theory, and review investigations into possible alternatives along a number of different lines, with a particular focus on highlighting the most promising directions. While the fundamental problems are proving reluctant to yield, the study of alternative cosmologies has led to considerable progress, with much more to come if hopes about forthcoming high-precision observations and new theoretical ideas are fulfilled.Keywords: cosmology -dark energy -cosmological constant problem -modified gravitydark matter -early universe Cosmology has been both blessed and cursed by the establishment of a standard model: ΛCDM. On the one hand, the model has turned out to be extremely predictive, explanatory, and observationally robust, providing us with a substantial understanding of the formation of large-scale structure, the state of the early Universe, and the cosmic abundance of different types of matter and energy. It has also survived an impressive battery of precision observational tests -anomalies are few and far between, and their significance is contentious where they do arise -and its predictions are continually being vindicated through the discovery of new effects (B-mode polarization [1] and lensing [2,3] of the cosmic microwave background (CMB), and the kinetic Sunyaev-Zel'dovich effect [4] being some recent examples). These are the hallmarks of a good and valuable physical theory.On the other hand, the model suffers from profound theoretical difficulties. The two largest contributions to the energy content at late times -cold dark matter (CDM) and the cosmological constant (Λ) -have entirely mysterious physical origins. CDM has so far evaded direct detection by laboratory experiments, and so the particle field responsible for it -presumably a manifestation of "beyond the standard model" particle physics -is unknown. Curious discrepancies also appear to exist between the predicted clustering properties of CDM on small scales and observations. The cosmological constant is even more puzzling, giving rise to quite simply the biggest problem in all of fundamental physics: the question of why Λ appears to take such an unnatural value [5,6,7]. Inflation, the theory of the very early Universe, has also been criticized for being fine-tuned and under-predictive [8], and appears to leave many problems either unsolved or fundamentally unresolvable. These problems are indicative of a crisis.From January 14th-17th 2015, we held a conference in Oslo, Norway to surve...

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Section: Model-independent Tests Of λCdm Discussion Session Chairs: Ementioning

confidence: 99%

“…The thermal SZ effect can test for anisotropy at distant clusters [444,445] while the kinetic SZ effect can detect anomalous radial cluster velocities [446]. Future measurements of SZ polarization will probe the remote CMB quadrupole and the cluster transverse velocity [447].…”

Section: Testing the Foundational Assumptions Of λCdm Plenary Speakermentioning

confidence: 99%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

444

210

View full text Add to dashboard Cite

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“…Various tests of the Copernican principle have been proposed and a large class of void models has been ruled out (e.g. [7][8][9]). Here we propose a powerful single test which confirms the Copernican principle at Gpc radial scale.…”

mentioning

confidence: 99%

“…This temperature shift will be anisotropic on our sky tracing the anisotropy of the projected free electron surface density. This test of the Copernican principle has been applied to cluster kSZ observations [7,9], where the electron surface density is high. However this effect applies to all free electrons which exist in great abundance everywhere in the universe up to the reionization epoch at redshift z > ∼ 6 (and comoving distance > ∼ 6h −1 Gpc), whereas clusters are rare above z ∼ 1.…”

mentioning

confidence: 99%

Confirmation of the Copernican Principle at Gpc Radial Scale and above from the Kinetic Sunyaev-Zel’dovich Effect Power Spectrum

2011

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The Copernican principle, a cornerstone of modern cosmology, remains largely unproven at Gpc radial scale and above. Here will show that, violations of this type will inevitably cause a first order anisotropic kinetic Sunyaev Zel'dovich (kSZ) effect. If large scale radial inhomogeneities have amplitude large enough to explain the "dark energy" phenomena, the induced kSZ power spectrum will be much larger than the ACT/SPT upper limit. This single test confirms the Copernican principle and rules out the adiabatic void model as a viable alternative to dark energy. 98.80.Es; 98.80.Bp; 95.36.+x

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“…However, radial homogeneity at larger scales remains unproven. Strong evidence in favour of this large-scale radial inhomogeneity and tests based on it includes: -deviation from a blackbody CMB spectrum [12,13]; -a strong kinetic Sunyaev Zel'dovich (kSZ) effect of galaxy clusters [12,14]; -varying spatial curvature [15]; -features in the SN1a Hubble diagram [16]; and -features in the time drift of cosmological redshift [17] and abnormal cosmic parallax [18].…”

Section: One Contribution Of 16 To a Theo Murphy Meeting Issue 'Testimentioning

confidence: 99%

Confirmation of the Copernican principle through the anisotropic kinetic Sunyaev Zel'dovich effect

Zhang

Stebbins

2011

Phil. Trans. R. Soc. A.

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The Copernican principle remains largely unproven at Gpc radial scale and above. Generally, violations of this type cause a first-order anisotropic kinetic Sunyaev Zel'dovich (kSZ) effect. Here we show that, if large-scale radial inhomogeneities have amplitude large enough to explain the 'dark energy' phenomena, the induced kSZ power spectrum will be orders of magnitude larger than the Atacama cosmology telescope/South Pole telescope upper limit. This single test rules out the void model as the cause of the apparent cosmic acceleration, confirms the Copernican principle on Gpc radial scale and above, and closes a loophole in the standard cosmology.

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Geocentrism reexamined

Cited by 100 publications

References 39 publications

BeyondΛCDM: Problems, solutions, and the road ahead

BeyondΛCDM: Problems, solutions, and the road ahead

Confirmation of the Copernican Principle at Gpc Radial Scale and above from the Kinetic Sunyaev-Zel’dovich Effect Power Spectrum

Confirmation of the Copernican principle through the anisotropic kinetic Sunyaev Zel'dovich effect

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