Title: Blue-tilted Primordial Gravitational Waves from Massive
Gravity
Abstract: We study a theory of massive tensor gravitons which
predicts blue-tilted and largely amplified primordial gravitational
waves. After inflation, while their mass is significant until it
diminishes to a small value, gravitons are diluted as non-relativistic
matter and hence their amplitude can be substantially amplified compared
to the massless gravitons which decay as radiation. We show that such
gravitational waves can be detected by interferometer experiments, even
if their signal is not observed on the CMB scales.