Probing cosmological isotropy with Planck Sunyaev–Zeldovich galaxy clusters

Bengaly, Carlos A. P.; Bernui, Armando; Ferreira, Ivan Soares; Alcaniz, J. S.

doi:10.1093/mnras/stw3233

Cited by 28 publications

(17 citation statements)

References 51 publications

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“…It is worth stressing that the observed Universe does not exhibit a statistically significant deviation from anisotropy at the cosmological scales [32]. In consequence, the assumption of isotropy of inflationary and post-inflationary Universe (as we made in Sect.…”

Section: Initial Conditions For Inflationmentioning

confidence: 81%

Quantum Hubble horizon

Artymowski

Mielczarek

2019

Eur. Phys. J. C

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The article addresses the possibility of obtaining cosmologically relevant effects from the quantum nature of the Hubble horizon. Following the observation made by Bianchi and Rovelli (Phys Rev D 84:027502, 2011) we explore the relationship between the Planck scale discreteness of the Hubble horizon and deformations of the symmetry of rotations. We show that the so-called q-deformations in a natural way lead to a mechanism of condensation in the very early Universe. We argue that this provides a possible resolution of the problem of the initial homogeneity at the onset of inflation. Furthermore, we perform an analysis in terms of entropy of the quantum Hubble horizon and show that the CDM model may arise from a linearly corrected Bekenstein-Hawking entropy (that is, linearly in area of the horizon). Based on this, we show that the current accelerating expansion can be associated with the entropy decrease in the Hubble volume. The results presented open new ways to explore the relation between the Planck scale effects and observationally relevant features of our Universe.

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Section: Initial Conditions For Inflationmentioning

confidence: 81%

Quantum Hubble horizon

Artymowski

Mielczarek

2019

Eur. Phys. J. C

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“…The assumption of isotropy needs to be tested with independent datasets and with diverse statistical measures. This has been done with various other observations such as the X-ray background (Wu et al 1999;Scharf et al 2000), radio sources (Wilson & Penzias 1967;Blake & Wall 2002), Gamma-ray bursts (Meegan et al 1992;Briggs et al 1996), supernovae (Gupta & Saini 2010;Lin et al 2016), galaxies (Marinoni et al 2012;Gibelyou & Huterer 2012;Yoon et al 2014;Alonso et al 2015;Pandey 2017), galaxy clusters (Bengaly et al 2017) and neutral hydrogen (Hazra & Shafieloo 2015). All these observations are consistent with the assumption of statistical isotropy.…”

Section: Introductionmentioning

confidence: 99%

Testing isotropy in the Universe using photometric and spectroscopic data from the SDSS

Sarkar

Pandey

Khatri

2018

Monthly Notices of the Royal Astronomical Society

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We analyze two volume limited galaxy samples from the SDSS photometric and spectroscopic data to test the isotropy in the local Universe. We use information entropy to quantify the global anisotropy in the galaxy distribution at different length scales and find that the galaxy distribution is highly anisotropic on small scales. The observed anisotropy diminishes with increasing length scales and nearly plateaus out beyond a length scale of 200 h −1 Mpc in both the datasets. We compare these anisotropies with those predicted by the mock catalogues from the N-body simulations of the ΛCDM model and find a fairly good agreement with the observations. We find a small residual anisotropy on large scales which decays in a way that is consistent with the linear perturbation theory. The slopes of the observed anisotropy converge to the slopes predicted by the linear theory beyond a length scale of ∼ 200 h −1 Mpc indicating a transition to isotropy. We separately compare the anisotropies observed across the different parts of the sky and find no evidence for a preferred direction in the galaxy distribution.

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“…galaxies [20][21][22][23][24][25][26][27], gravitational lensing [28][29][30], 21-cm fluctuations [31] and CMB spectral distortions [32,33]. These observables can yield the constraints at scales and redshifts unaccessible by the analysis of the CMB anisotropies, which most of the preceding studies focused on [21,[34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Polypolar spherical harmonic decomposition of galaxy correlators in redshift space: Toward testing cosmic rotational symmetry

2017

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We propose an efficient way to test rotational invariance in the cosmological perturbations by use of galaxy correlation functions. In symmetry-breaking cases, the galaxy power spectrum can have extra angular dependence in addition to the usual one due to the redshift-space distortion, k ·n. We confirm that, via the decomposition into not the usual Legendre basis L (k ·n) but the bipolar spherical harmonic one {Y (k)⊗Y (n)}LM , the symmetry-breaking signal can be completely distinguished from the usual isotropic one since the former yields nonvanishing L ≥ 1 modes but the latter is confined to the L = 0 one. As a demonstration, we analyze the signatures due to primordial-origin symmetry breakings such as the well-known quadrupolar-type and dipolar-type power asymmetries and find nonzero L = 2 and 1 modes, respectively. Fisher matrix forecasts of their constraints indicate that the Planck-level sensitivity could be achieved by the SDSS or BOSS-CMASS data, and an order-of-magnitude improvement is expected in a near future survey as PFS or Euclid by virtue of an increase in accessible Fourier mode. Our methodology is model-independent and hence applicable to the searches for various types of statistically anisotropic fluctuations.

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Probing cosmological isotropy with Planck Sunyaev–Zeldovich galaxy clusters

Cited by 28 publications

References 51 publications

Quantum Hubble horizon

Quantum Hubble horizon

Testing isotropy in the Universe using photometric and spectroscopic data from the SDSS

Polypolar spherical harmonic decomposition of galaxy correlators in redshift space: Toward testing cosmic rotational symmetry

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