Self-Annihilating Dark Matter (DM) candidates can modify the recombination history of the Universe, injecting additional energy into the thermal gas, and modifying its ionization state. The electron fraction history affects the CMB temperature and polarization power spectra; observations of the modifications (or of the absence) of the latter can then be used to constrain the power injected by annihilating DM, and ultimately the DM parameters themselves. DM annihilations able to modify the CMB spectra are active at redshifts 100 ×z× 1000, thus involving only a smooth density field, and permitting to ignore structure formation. Current WMAP7 data on the TT, TE and EE angular power spectra already permit to rule out interesting regions in the 〈σv〉 -mx space; the forthcoming PLANCK ones will permit to explore the "thermal WIMP" region. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution- NonCommercial-ShareAlike Licence.
Constraining Dark Matter through CMB / Iocco, F.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - (2010). ( 8th International Workshop on Identification of Dark Matter, IDM 2010 Montpellier, fra 2010).
Constraining Dark Matter through CMB
Iocco F.
2010
Abstract
Self-Annihilating Dark Matter (DM) candidates can modify the recombination history of the Universe, injecting additional energy into the thermal gas, and modifying its ionization state. The electron fraction history affects the CMB temperature and polarization power spectra; observations of the modifications (or of the absence) of the latter can then be used to constrain the power injected by annihilating DM, and ultimately the DM parameters themselves. DM annihilations able to modify the CMB spectra are active at redshifts 100 ×z× 1000, thus involving only a smooth density field, and permitting to ignore structure formation. Current WMAP7 data on the TT, TE and EE angular power spectra already permit to rule out interesting regions in the 〈σv〉 -mx space; the forthcoming PLANCK ones will permit to explore the "thermal WIMP" region. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution- NonCommercial-ShareAlike Licence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
