Recent data from the WMAP, ACT and SPT experiments provide precise measurements of the cosmic microwave background temperature power spectrum over a wide range of angular scales. The combination of these observations is well fit by the standard, spatially flat Lambda CDM cosmological model, constraining six free parameters to within a few percent. The scalar spectral index, n(s) = 0.9690 +/- 0.0089, is less than unity at the 3.5 sigma level, consistent with simple models of inflation. The damping tail of the power spectrum at high resolution, combined with the amplitude of gravitational lensing measured by ACT and SPT, constrains the effective number of relativistic species to be N-eff = 3.28 +/- 0.40, in agreement with the standard model's three species of light neutrinos.
Cosmological parameters from pre-planck cosmic microwave background measurements / Calabrese, Erminia; Renee A., Hlozek; Nick, Battaglia; Battistelli, Elia Stefano; J., Richard Bond; Jens, Chluba; Devin, Crichton; Sudeep, Das; J., Devlin Mark; Joanna, Dunkley; Rolando, Dunner; Marzieh, Farhang; Megan B., Gralla; Amir, Hajian; Halpern, Mark; Matthew, Hasselfield; Adam D., Hincks; D., Irwin Kent; Arthur, Kosowsky; Thibaut, Louis; Tobias A., Marriage; Kavilan, Moodley; Laura, Newburgh; Michael D., Niemack; Michael R., Nolta; Lyman A., Page; Neelima, Sehgal; D., Sherwin Blake; Jonathan L., Sievers; Cristobal, Sifon; David N., Spergel; Suzanne T., Staggs; Eric R., Switzer; J., Wollack Edward. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 87:(2013). [10.1103/physrevd.87.103012]
Cosmological parameters from pre-planck cosmic microwave background measurements
CALABRESE, ERMINIA;BATTISTELLI, Elia Stefano;
2013
Abstract
Recent data from the WMAP, ACT and SPT experiments provide precise measurements of the cosmic microwave background temperature power spectrum over a wide range of angular scales. The combination of these observations is well fit by the standard, spatially flat Lambda CDM cosmological model, constraining six free parameters to within a few percent. The scalar spectral index, n(s) = 0.9690 +/- 0.0089, is less than unity at the 3.5 sigma level, consistent with simple models of inflation. The damping tail of the power spectrum at high resolution, combined with the amplitude of gravitational lensing measured by ACT and SPT, constrains the effective number of relativistic species to be N-eff = 3.28 +/- 0.40, in agreement with the standard model's three species of light neutrinos.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
