Dan Solomon
Published 2009-03-03, updated 2009-03-14Version 2
In quantum field theory, it is generally assumed that there is a lower bound to the energy, which is normally assumed to the the vacuum state. While this may be a reasonable assumption for a free field it is not necessarily the case for interacting fields. In this paper I will examine a "toy" model of a neutral scalar field interacting with a charged scalar field and show that there is no lower bound to the energy in this case.
Comments: Minor editorial changes
A Lower Bound on the Quantum Capacity of Channels with Correlated Errors
Violations of Bell inequalities as lower bounds on the communication cost of non-local correlations
Optimal Perfect Distinguishability between Unitaries and Quantum Operations
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