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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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Cosmological constraints on deviations from Lorentz invariance in gravity and dark matter
/ Audren, B. (ITPP, Lausanne) ; Blas, D. (CERN) ; Ivanov, M.M. (Moscow State U. ; Moscow, INR) ; Lesgourgues, J. (ITPP, Lausanne ; CERN ; Annecy, LAPTH) ; Sibiryakov, S. (ITPP, Lausanne ; CERN ; Moscow, INR)
We consider a scenario where local Lorentz invariance is violated by the existence of a preferred time direction at every space-time point. This scenario can arise in the context of quantum gravity and its description at low energies contains a unit time-like vector field which parameterizes the preferred direction. [...]
arXiv:1410.6514; CERN-PH-TH-2014-196; INR-TH-2014-024; LAPTH-225-14; CERN-PH-TH-2014-196; INR-TH-2014-024; LAPTH-225-14.-
2015-03-10 - 9 p.
- Published in : JCAP 03 (2015) 016
Fulltext: PDF; External link: Preprint
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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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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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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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Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report
/ Brooijmans, G. (Columbia U.) ; Contino, R. (ITPP, Lausanne ; CERN) ; Fuks, B. (CERN ; Strasbourg, IPHC) ; Moortgat, F. (CERN) ; Richardson, P. ; Sekmen, S. (CERN) ; Weiler, A. (CERN) ; Alloul, A. ; Arbey, A. (CERN ; Lyon Observ. ; Lyon U. ; Lyon, Ecole Normale Superieure ; Lyon, IPN) ; Baglio, J. (KIT, Karlsruhe, TP) et al.
We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). [...]
arXiv:1405.1617.
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2014. - 201 p.
Preprint - Full text
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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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