Brandenburg Axel, Protiti Nousaba Nasrin
Nordita, KTH Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, 10691 Stockholm, Sweden.
Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, 10691 Stockholm, Sweden.
Entropy (Basel). 2023 Aug 29;25(9):1270. doi: 10.3390/e25091270.
The conversion of electromagnetic energy into magnetohydrodynamic energy occurs when the electric conductivity changes from negligible to finite values. This process is relevant during the epoch of reheating in the early universe at the end of inflation and before the emergence of the radiation-dominated era. We find that the conversion into kinetic and thermal energies is primarily the result of electric energy dissipation, while magnetic energy only plays a secondary role in this process. This means that since electric energy dominates over magnetic energy during inflation and reheating, significant amounts of electric energy can be converted into magnetohydrodynamic energy when conductivity emerges before the relevant length scales become stable.
当电导率从可忽略不计的值变为有限值时，电磁能就会转化为磁流体动力能。在暴胀结束后、辐射主导时代出现之前的早期宇宙再加热时期，这个过程是相关的。我们发现，转化为动能和热能主要是电能耗散的结果，而磁能在这个过程中只起次要作用。这意味着，由于在暴胀和再加热期间电能主导磁能，当电导率在相关长度尺度变得稳定之前出现时，大量电能可以转化为磁流体动力能。
