Buddhism after death From what I understand the aggregates aren't self but now when a person dies and the material aggregates of his body dissolve then what remains who gets reincarnated ?.If there is no soul then what carries the information of this person to go to another life for example what defines that this is the person and not someone else do we have a serial number :) ?.

When the new material aggregates of the new body are born then they are different from the ones of the person who died .What defines that THIS person is in THAT body?.
According to SN 12.17, Eternalist have the view ‘The one who acts is the one who experiences’ and annihilationist have the view ‘The one who acts is someone other than the one who experiences.


  "'The one who acts is the one who experiences [the result of the act]' amounts to the eternalist statement, 'Existing from the very beginning, stress is self-made.' 'The one who acts is someone other than the one who experiences'[2] amounts to the annihilationist statement, 'For one existing harassed by feeling, stress is other-made.' Avoiding these two extremes, the Tathagata teaches the Dhamma via the middle:


The Buddha teaches via the middle. So our view or the “Buddhist view” would be,


  ‘From ignorance as a requisite condition come fabrications.
  From fabrications as a requisite condition comes consciousness.
  From consciousness as a requisite condition comes name-&amp;-form.
  From name-&amp;-form as a requisite condition come the six sense media.
  From the six sense media as a requisite condition comes contact.
  From contact as a requisite condition comes feeling.
  From feeling as a requisite condition comes craving.
  From craving as a requisite condition comes clinging/sustenance.
  From clinging/sustenance as a requisite condition comes becoming.
  From becoming as a requisite condition comes birth.
  From birth as a requisite condition, then aging &amp; death, sorrow, lamentation, pain, distress, &amp; despair come into play. Such is the origination of this entire mass of stress &amp; suffering.’