CERN Accelerating science

Página principal > Resultados da pesquisa: Tram, Thomas
Sugestões de pesquisa
Pesquisa Avançada
Add to Search +
Pesquisar colecções:
Ordenar por: Display results: Output format:
CERN Document Server 7 records found  Search took 0.57 seconds. 
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
Registo detalhado - Registos similares
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
Registo detalhado - Registos similares
3.
The effective gravitational decoupling between dark matter and the CMB / Voruz, Luc (IPT, Lausanne) ; Lesgourgues, Julien (IPT, Lausanne ; CERN ; Annecy, LAPTH) ; Tram, Thomas (IPT, Lausanne)
We present a detailed and self-contained analytical derivation of the evolution of sub-horizon cosmological perturbations before decoupling, based on previous work by S. Weinberg. [...]
arXiv:1312.5301; CERN-PH-TH-2013-313; LAPTH-073-13.- 2014 - 23 p. - Published in : JCAP 03 (2014) 004 External link: Preprint
Registo detalhado - Registos similares
4.
Fast and accurate CMB computations in non-flat FLRW universes / Lesgourgues, Julien (ITPP, Lausanne ; CERN ; Annecy, LAPTH) ; Tram, Thomas (ITPP, Lausanne)
We present a new method for calculating CMB anisotropies in a non-flat Friedmann universe, relying on a very stable algorithm for the calculation of hyperspherical Bessel functions, that can be pushed to arbitrary precision levels. We also introduce a new approximation scheme which gradually takes over in the flat space limit, and significant speeds-up calculations. [...]
arXiv:1312.2697; CERN-PH-TH-2013-298; LAPTH-071-13; CERN-PH-TH-2013-298; LAPTH-071-13.- 2014-09-17 - 35 p. - Published in : JCAP 09 (2014) 032 External link: Preprint
Registo detalhado - Registos similares
5.
Optimal polarisation equations in FLRW universes / Tram, Thomas (ITPP, Lausanne) ; Lesgourgues, Julien (ITPP, Lausanne ; CERN ; Annecy, LAPTH)
This paper presents the linearised Boltzmann equation for photons for scalar, vector and tensor perturbations in flat, open and closed FLRW cosmologies. We show that E- and B-mode polarisation for all types can be computed using only a single hierarchy. [...]
arXiv:1305.3261; CERN-PH-TH-2013-099; LAPTH-025-13; CERN-PH-TH-2013-099; LAPTH-025-13.- 2013-10-01 - 27 p. - Published in : JCAP 10 (2013) 002 Fulltext: PDF; External link: Preprint
Registo detalhado - Registos similares
6.
The Cosmic Linear Anisotropy Solving System (CLASS) IV: efficient implementation of non-cold relics / Lesgourgues, Julien (IPT, Lausanne ; CERN ; Annecy, LAPTH) ; Tram, Thomas (Aarhus U. ; CERN)
We present a new flexible, fast and accurate way to implement massive neutrinos, warm dark matter and any other non-cold dark matter relics in Boltzmann codes. For whatever analytical or numerical form of the phase-space distribution function, the optimal sampling in momentum space compatible with a given level of accuracy is automatically found by comparing quadrature methods. [...]
arXiv:1104.2935; CERN-PH-TH-2011-084.- 2011 - 23 p. - Published in : JCAP 09 (2011) 032 Fulltext: PDF; External link: Preprint
Registo detalhado - Registos similares
7.
The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes / Blas, Diego ; Lesgourgues, Julien ; Tram, Thomas
Boltzmann codes are used extensively by several groups for constraining cosmological parameters with Cosmic Microwave Background and Large Scale Structure data. This activity is computationally expensive, since a typical project requires from 10'000 to 100'000 Boltzmann code executions. [...]
arXiv:1104.2933; CERN-PH-TH-2011-082; LAPTH-010-11; CERN-PH-TH-2011-082.- 2011 - 35 p. - Published in : JCAP 07 (2011) 034 Fulltext: PDF; External link: Preprint
Registo detalhado - Registos similares

Veja também: nomes de autores similares
1 Tram, Thomas (ICG Portsmouth)
Interested in being notified about new results for this query?
Set up a personal email alert or subscribe to the RSS feed.
Haven't found what you were looking for? Try your search on other servers:
Tram, Thomas em Amazon
Tram, Thomas em CERN EDMS
Tram, Thomas em CERN Intranet
Tram, Thomas em CiteSeer
Tram, Thomas em Google Books
Tram, Thomas em Google Scholar
Tram, Thomas em Google Web
Tram, Thomas em IEC		Tram, Thomas em IHS
Tram, Thomas em INSPIRE
Tram, Thomas em ISO
Tram, Thomas em KISS Books/Journals
Tram, Thomas em KISS Preprints
Tram, Thomas em NEBIS
Tram, Thomas em SLAC Library Catalog
Tram, Thomas em Scirus