Planck 2015 results. XIX. Constraints on primordial magnetic fields
Abstract
We compute and investigate four types of imprint of a stochastic background of primordial magnetic fields (PMFs) on the cosmic microwave background (CMB) anisotropies: the impact of PMFs on the CMB temperature and polarization spectra, which is related to their contribution to cosmological perturbations; the effect on CMB polarization induced by Faraday rotation; the impact of PMFs on the ionization history; magnetically-induced non-Gaussianities and related non-zero bispectra; and the magnetically-induced breaking of statistical isotropy. We present constraints on the amplitude of PMFs that are derived from different Planck data products, depending on the specific effect that is being analysed. Overall, Planck data constrain the amplitude of PMFs to less than a few nanoGauss, with different bounds that depend on the considered model. In particular, individual limits coming from the analysis of the CMB angular power spectra, using the Planck likelihood, are B_(1 Mpc) < 4.4 nG (where B_(1 Mpc) is the comoving field amplitude at a scale of 1 Mpc) at 95% confidence level, assuming zero helicity. By considering the Planck likelihood, based only on parity-even angular power spectra, we obtain B_(1 Mpc) < 5.6 nG for a maximally helical field. For nearly scale-invariant PMFs we obtain B_(1 Mpc) < 2.0 nG and B_(1 Mpc) < 0.9 nG if the impact of PMFs on the ionization history of the Universe is included in the analysis. From the analysis of magnetically-induced non-Gaussianity, we obtain three different values, corresponding to three applied methods, all below 5 nG. The constraint from the magnetically-induced passive-tensor bispectrum is B_(1 Mpc) < 2.8 nG. A search for preferred directions in the magnetically-induced passive bispectrum yields B_(1 Mpc) < 4.5 nG, whereas the compensated-scalar bispectrum gives B_(1 Mpc) < 3 nG. The analysis of the Faraday rotation of CMB polarization by PMFs uses the Planck power spectra in EE and BB at 70 GHz and gives B_(1 Mpc) < 1380 nG. In our final analysis, we consider the harmonic-space correlations produced by Alfvén waves, finding no significant evidence for the presence of these waves. Together, these results comprise a comprehensive set of constraints on possible PMFs with Planck data.
Additional Information
© 2016 ESO. Received: 5 February 2015; Accepted: 19 February 2016; Published online 20 September 2016. The Planck Collaboration acknowledges the support of: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MINECO, JA, and RES (Spain); Tekes, AoF, and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); ERC and PRACE (EU). A description of the Planck Collaboration and a list of its members, indicating which technical or scientific activities they have been involved in, can be found at http://www.cosmos.esa.int/web/planck/planck-collaboration. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the US Department of Energy under Contract No. DE-AC02-05CH11231. Some of the results in this paper have been derived using the HEALPix package.Attached Files
Published - aa25821-15.pdf
Submitted - 1502.01594v1.pdf
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Additional details
- Eprint ID
- 60286
- Resolver ID
- CaltechAUTHORS:20150916-145551601
- European Space Agency (ESA)
- Centre National d'Études Spatiales (CNES)
- Centre National de la Recherche Scientifique (CNRS)
- Institut National des Sciences de l'Univers (INSU)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Institut National du Patrimoine (INP)
- Agenzia Spaziale Italiana (ASI)
- Consiglio Nazionale delle Ricerche (CNR)
- Istituto Nazionale di Astrofisica (INAF)
- NASA
- Department of Energy (DOE)
- Science and Technology Facilities Council (STFC)
- United Kingdom Space Agency (UKSA)
- Consejo Superior de Investigaciones Científicas (CSIC)
- Ministerio de Economía, Industria y Competitividad (MINECO)
- Junta de Andalucía
- RES (Spain)
- Finnish Funding Agency for Technology and Innovation (Tekes)
- Academy of Finland
- Finnish IT Center for Science (CSC)
- Deutschen Zentrums für Luft- und Raumfahrt (DLR)
- Max-Planck-Gesellschaft (MPG)
- Canadian Space Agency (CSA)
- DTU Space
- State Secretariat for Education, Research and Innovation (SER)
- Swiss Space Office (SSO)
- Research Council of Norway
- Science Foundation, Ireland
- Fundação para a Ciência e a Tecnologia (FCT)
- Ministério da Ciência, Tecnologia e Ensino Superior (MCTES)
- European Research Council (ERC)
- PRACE (EU)
- Department of Energy (DOE)
- DE-AC02-05CH11231
- Created
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2015-09-17Created from EPrint's datestamp field
- Updated
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2023-03-15Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC), COSMOS