  These lectures deal with selected aspects of quantum field theory in curved
spacetime including the following topics: (1) Quantization of fields on a
curved background, particle creation by gravitational fields, particle creation
in an expanding universe; moving mirror radiation. (2) The Hawking effect -
particle creation by black holes. (3) Ultraviolet and infrared divergences,
renormalization of the expectation value of the stress tensor; global symmetry
breaking in curved spacetime. (4) Negative energy in quantum field theory, its
gravitational effects, and inequalities which limit negative energy densities
and fluxes. (5) The semiclassical theory of gravity and its limitations,
breakdown of this theory due to metric fluctuations, lightcone fluctuations.
