Cohomological properties of maximal pro-p Galois groups that are preserved under profinite completion

Abstract Let p be a prime number. One of the most difficult and important questions in Galois theory these days is determining which pro- p groups can occur as maximal pro- p Galois groups. Some restrictions of the structure of maximal pro- p Galois groups are already known, and therefore, the families of all pro- p groups satisfying these restrictions are in the center of the research. In the current paper we deal with three of these families: The family of all pro- p groups which satisfy hereditarily the n -vanishing Massey product property, the family of 1-cyclotomic oriented pro- p groups, and the family of pro- p groups that are hereditarily of p -absolute Galois type. We show that all these families are closed under taking profinite completion of each order.