Does Christianity or the Bible forbid polygamy and widow remarriage?

I've seen people advocate widow celibate for the reason of a happy reunion of the marriage bond in Heaven. As I understand it, this appeal is based on the rejection of polygamy, which is based on the rejection of lustful feelings towards a woman outside the marriage which is considered a lechery . According to a Czech master's thesis I've read, Christianity has surmounted polygamy as Jesus establishes the equality of man and woman: "*There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus.*" Galatians 3:28 However, I don't consider this a sufficient basis. So what does Christianity base the rejection of polygamy and widow remmariage base upon? Thank you!