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CERN Document Server 6 записей найдено  Поиск длился 0.60 секунд. 
1.
Robustness of cosmic neutrino background detection in the cosmic microwave background / Audren, Benjamin (IPT, Lausanne) ; Bellini, Emilio (ICC, Barcelona U.) ; Cuesta, Antonio J (ICC, Barcelona U.) ; Gontcho, Satya Gontcho A (ICC, Barcelona U.) ; Lesgourgues, Julien (CERN ; Annecy, LAPTH) ; Niro, Viviana (Madrid, Autonoma U ; Madrid, IFT) ; Pellejero-Ibanez, Marcos (IAC, La Laguna ; Laguna U., Tenerife) ; Pérez-Ràfols, Ignasi (ICC, Barcelona U.) ; Poulin, Vivian (Annecy, LAPTH) ; Tram, Thomas et al.
The existence of a cosmic neutrino background can be probed indirectly by CMB experiments, not only by measuring the background density of radiation in the universe, but also by searching for the typical signatures of the fluctuations of free-streaming species in the temperature and polarisation power spectrum. Previous studies have already proposed a rather generic parametrisation of these fluctuations, that could help to discriminate between the signature of ordinary free-streaming neutrinos, or of more exotic dark radiation models. [...]
arXiv:1412.5948; CERN-PH-TH-2014-266; LAPTH-238-14; FTUAM-14-51; IFT-UAM-CSIC-14-132.- 2015 - 18 p. - Published in : JCAP 03 (2015) 036 Fulltext: PDF; External link: Preprint
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2.
Strongest model-independent bound on the lifetime of Dark Matter / Audren, Benjamin (ITPP, Lausanne) ; Lesgourgues, Julien (ITPP, Lausanne ; CERN ; Annecy, LAPTH) ; Mangano, Gianpiero (INFN, Naples) ; Serpico, Pasquale Dario (Annecy, LAPTH) ; Tram, Thomas (ITPP, Lausanne)
Dark Matter is essential for structure formation in the late Universe so it must be stable on cosmological time scales. But how stable exactly? Only assuming decays into relativistic particles, we report an otherwise model independent bound on the lifetime of Dark Matter using current cosmological data. [...]
arXiv:1407.2418; CERN-PH-TH-2014-105.- 2014 - 15 p. - Published in : JCAP 12 (2014) 028 Fulltext: PDF; External link: Preprint
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3.
Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code / Audren, Benjamin (ITPP, Lausanne) ; Lesgourgues, Julien (ITPP, Lausanne ; CERN ; Annecy, LAPTH) ; Benabed, Karim (Paris, Inst. Astrophys.) ; Prunet, Simon (Paris, Inst. Astrophys.)
Models for the latest stages of the cosmological evolution rely on a less solid theoretical and observational ground than the description of earlier stages like BBN and recombination. As suggested in a previous work by Vonlanthen et al., it is possible to tweak the analysis of CMB data in such way to avoid making assumptions on the late evolution, and obtain robust constraints on "early cosmology parameters". [...]
arXiv:1210.7183; CERN-PH-TH-2012-290; LAPTH-048-12.- 2013 - 18 p. - Published in : JCAP 02 (2013) 001 Fulltext: PDF; External link: Preprint
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4.
Neutrino masses and cosmological parameters from a Euclid-like survey: Markov Chain Monte Carlo forecasts including theoretical errors / Audren, Benjamin (ITPP, Lausanne) ; Lesgourgues, Julien (ITPP, Lausanne ; CERN ; Annecy, LAPTH) ; Bird, Simeon (Princeton, Inst. Advanced Study) ; Haehnelt, Martin G. (Cambridge U., KICC ; Cambridge U., Inst. of Astron.) ; Viel, Matteo (Trieste Observ. ; INFN, Trieste)
We present forecasts for the accuracy of determining the parameters of a minimal cosmological model and the total neutrino mass based on combined mock data for a future Euclid-like galaxy survey and Planck. We consider two different galaxy surveys: a spectroscopic redshift survey and a cosmic shear survey. [...]
arXiv:1210.2194; CERN-PH-TH-2012-261; LAPTH-046-12.- 2013 - 25 p. - Published in : JCAP 01 (2013) 026 Preprint: PDF; External link: Preprint
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5.
CMB photons shedding light on dark matter / Giesen, Gaelle (IPT, Lausanne) ; Lesgourgues, Julien (IPT, Lausanne ; CERN ; Annecy, LAPTH) ; Audren, Benjamin (IPT, Lausanne) ; Ali-Haïmoud, Yacine (Princeton, Inst. Advanced Study)
The annihilation or decay of Dark Matter (DM) particles could affect the thermal history of the universe and leave an observable signature in Cosmic Microwave Background (CMB) anisotropies. We update constraints on the annihilation rate of DM particles in the smooth cosmological background, using WMAP7 and recent small-scale CMB data. [...]
arXiv:1209.0247; CERN-PH-TH-2012-216; LAPTH-038-12.- 2012 - 35 p. - Published in : JCAP 12 (2012) 008 Fulltext: PDF; IOP Open Access article: PDF; External link: Preprint
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6.
Non-linear matter power spectrum from Time Renormalisation Group: efficient computation and comparison with one-loop / Audren, Benjamin (ITPP, Lausanne) ; Lesgourgues, Julien (ITPP, Lausanne ; CERN ; Annecy, LAPTH)
We address the issue of computing the non-linear matter power spectrum on mildly non-linear scales with efficient semi-analytic methods. We implemented M. [...]
arXiv:1106.2607; CERN-PH-TH-2011-097; LAPTH-014-11.- 2011 - 24 p. - Published in : JCAP 10 (2011) 037 Fulltext: PDF; External link: Preprint
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