ᴀᴄᴛɪᴏɴ;
We believe the dome is generating a temporal field which is protecting us from the affects of space-time, thus allowing it to exist in a state of temporal flux outside of the normal flow of space-time. The Borg have assimilated species who possess such technological capabilities. It is logical to assume that our wardens may, as well.
[ though the borg knowledge still packed into her head was obtained through monstrous means, it was still informative and had proven to be advantageous to voyager and her crew on more than one occasion. ]