Acceleration in space

Scenario: I have a generation ship moving between two star systems. Given that such a ship needs to have a completely self sufficient life cycle system to make it viable, ejecting mass continuously does not seem to me to be a very viable option for acceleration.

With this given scenario what other methods can be used to achieve acceleration and deceleration in interstellar space? I would like answers to be bound by the known laws of physics in our universe.

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Acceleration in space

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