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Titolo: MIXED MODELS WITH N-GREATER-THAN-1 AND LARGE-SCALE STRUCTURE CONSTRAINTS
Autore: BONOMETTO SA; PIERPAOLI E;
- Indirizzi:
- UNIV MILAN,DIPARTIMENTO FIS,VIA CELORIA 16 I-20133 MILAN ITALY INFN,SEZ MILANO I-20133 MILAN ITALY SCUOLA INT SUPER STUDI AVANZATI,SISSA I-34013 TRIESTE ITALY
- Titolo Testata:
- New astronomy
fascicolo: 6,
volume: 3,
anno: 1998,
pagine: 391 - 409
- SICI:
- 1384-1092(1998)3:6<391:MMWNAL>2.0.ZU;2-1
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- DARK-MATTER MODELS; FLUCTUATION EVOLUTION; MASS FLUCTUATIONS; GALAXY CLUSTERS; INFLATION; UNIVERSE; SPECTRUM; NUCLEOSYNTHESIS; AMPLITUDE; COMPONENT;
- Keywords:
- COSMOLOGY, THEORY; DARK MATTER; LARGE-SCALE STRUCTURE OF UNIVERSE;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Science Citation Index Expanded
- Citazioni:
- 56
- Recensione:
- Indirizzi per estratti:
-
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- Citazione:
- S.A. Bonometto e E. Pierpaoli, "MIXED MODELS WITH N-GREATER-THAN-1 AND LARGE-SCALE STRUCTURE CONSTRAINTS", New astronomy, 3(6), 1998, pp. 391-409
Abstract
Recent data on CBR anisotropies show a Doppler peak higher than expected in CDM cosmological models, if the spectral index n = 1. However, CDM and LCDM models with n > 1 can hardly be consistent with LSS data. Mixed models, instead, whose transfer function is naturally steeper because of free-streaming in the hot component, may become consistent with data if n > 1, when Omega(h) is large. This is confirmed by our detailed analysis, extended both to models with a hot component whose momentum space distribution had a thermal origin (like massive neutrinos), and to models with a non-cold component arising from heavier particle decay. In this work we systematically search models which fulfill all constraints which can be implemented at the linear level. We find that a stringent linear constraint arises from fitting the extra-power parameter Gamma. Other significant constraints arise comparing the expected abundances of galaxy clusters and high-z systems with observational data. If low values of Gamma are permitted, mixed models with 1 less than or equal to n less than or equal to 1.4 can have up to similarto 45% of non-cold component, without violating any further linear constraint. Keeping to models with Gamma greater than or equal to 0.13, a suitable part of the space parameter still allows up to similar to 30% of hot component (it is worth outlining that our stringent criteriaallow only models with 0.10 less than or similar to Omega(h) less than or similar to 0.16, if n less than or equal to 1). Spectra with n.1 are briefly discussed within the frame of inflationary theories. We also outline that models with such large non-cold component would ease the solution of the so-called baryon catastrophe in galaxy clusters. (C) 1998 Elsevier Science B.V. All rights reserved.
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Documento generato il 19/06/13 alle ore 15:53:54