The phrase the heavens breaking open shows that Jesus has a unique and direct relationship with God the Father. In Mark 15:38, the same verb shows that believers also gain access to God through the death of Jesus.
All four Gospels mention the Holy Spirit coming down on Jesus like a dove. The Spirit, who was active in the first creation, now works with Jesus to begin the new creation (Genesis 1:2; Romans 8:15–17; 1 Corinthians 6:11; Ephesians 1:13–14; 2 Thessalonians 2:13).