出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The primordial magnetic field (PMF) can strongly affect the cosmic microwave background
(CMB) power spectrum and the formation of large scale structure. In this presentation, we calculate
the CMB temperature anisotropies generated by including a power-law magnetic field at
the photon last scattering surface (PLSS). We then deduce an upper limit on the primordial magnetic
field based upon our theoretical analysis of the power excess on small angular scales. We
have taken into account several important effects such as the modified matter sound speed in
the presence of a magnetic field. An upper limit to the field strength of |Bλ | 4.7 nG at the
present scale of 1 Mpc is deduced. This is obtained by comparing the calculated theoretical result
including the Sunyaev-Zeldovich (SZ) effect with recent observed data on the small scale CMB
anisotropies from theWilkinson Microwave Anisotropy Probe (WMAP), the Cosmic Background
Imager (CBI) and the Arcminute Cosmology Bolometer Array Receiver (ACBAR). We discuss
several possible mechanisms for the generation and evolution of the PMF before, during and after
the BBN.
