All moments in time(The past, present and future) exist and are happening at the same time this is because of the universal wave function(UWF), the UWF also produces infinite outcomes because the universe can have infinite possibilities so infinite universes and because of the weird maths of infinite energy these universes can split away from each other forming the infinite universes and they split away and become another face of a higher dimensional shape made up of other universes. What exactly causes time? Well the spinning-vibrating energy field causes time but how? well lots of energy causes the energy to vibrate and this causes time the smallest vibration is at the size of the Planck length so the smallest period of time is the Planck time and this vibrating energy is spinning because the superstrings are small loop-torus of vibrating energy and this causes the energy field to spin(This also creates the scalar field which encodes all the vibrational dimensions) this creates the scalar field which is made up of (super-symmetrical) photons-kugelblitzs which reality is made up of and when it duplicates(psudo-copies) it splits away and forms another universe.
So how would we time travel? We would use the quantum energy crystals to create a time machine but how would it work? Well the quantum energy crystal time machine would create a torus-shaped bubble around you containing apart of the energy field and therefore all the singularities within the bubble, the bubble becomes an energy field itself and this energy field is magnetic so it is an electromagnetic field(EF) which can control the singularities and these singularities spin in the direction of the energy field and the EF spins the singularities in the direction you want so you can go backwards and forwards in time because the bubble separates from the main energy field and becomes a wormhole which connects to a cosmic string which goes through the higher dimensions/(main)energy field.
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L-Mann 'A Universal Theory"
Non-Fiction'A beautiful mix of what we would consider as the best theories to link general relativity and quantum physics' By LC and Hermann Book is currently on hold PDF form: https://drive.google.com/open?id=1kcbOvJlnT7c5IstR6VX6_mO1w32G62XAdjHM0NiE3rE