Are we living near the center of a local void?
| Autor: | Giulia Cusin, Jean-Philippe Uzan, Cyril Pitrou |
|---|---|
| Přispěvatelé: | Institut Lagrange de Paris, Sorbonne Universités, Institut d'Astrophysique de Paris ( IAP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
High Energy Physics - Theory
Void (astronomy) velocity Cosmology and Nongalactic Astrophysics (astro-ph.CO) polarization: anisotropy [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] Diagonal Cosmic microwave background Cosmic background radiation FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics cosmic background radiation Correlation function (quantum field theory) local void 01 natural sciences General Relativity and Quantum Cosmology [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th] 0103 physical sciences effect: geometrical structure correlation function symmetry: rotation Anisotropy 010303 astronomy & astrophysics Physics [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th] 010308 nuclear & particles physics angular correlation formation anisotropy: measured Astronomy and Astrophysics Local Void High Energy Physics - Theory (hep-th) kinematics Excited state Quantum electrodynamics [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] polarization: correlation [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] signature Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | JCAP JCAP, 2017, 03 (03), pp.038. 〈10.1088/1475-7516/2017/03/038〉 JCAP, 2017, 03, pp.038. ⟨10.1088/1475-7516/2017/03/038⟩ |
| DOI: | 10.1088/1475-7516/2017/03/038〉 |
| Popis: | The properties of the cosmic microwave background (CMB) temperature and polarisation anisotropies measured by a static, off-centered observer located in a local spherically symmetric void, are described. In particular in this paper we compute, together with the standard 2- point angular correlation functions, the off-diagonal correlators, which are no more vanishing by symmetry. While the energy shift induced by the off-centered position of the observer can be suppressed by a proper choice of the observer velocity, a lensing-like effect on the CMB emission point remains. This latter effect is genuinely geometrical (e.g. non-degenerate with a boost) and reflects in the structure of the off-diagonal correlators. At lowest order in this effect, the temperature and polarisation correlation matrices have non-vanishing diagonal elements, as usual, and all the off-diagonal terms are excited. This particular signature of a local void model allows one, in principle, to disentangle geometrical effects from local kinematical ones in CMB observations. Comment: 49 pages, 8 figures |
| Databáze: | OpenAIRE |
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