Journal
MODERN PHYSICS LETTERS A
Volume 30, Issue 3-4, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732315400064
Keywords
Massive gravity; characteristics; acausality; superluminality; ghost modes
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Funding
- Taiwan National Science Council [NSC101-2811-M-002-103]
- Indian Institute of Science Bangalore
- DOE [PHY-1266107, DE-SC0011632]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1266107] Funding Source: National Science Foundation
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The method of characteristics is a key tool for studying consistency of equations of motion; it allows issues such as predictability, maximal propagation speed, superluminality, unitarity and acausality to be addressed without requiring explicit solutions. We review this method and its application to massive gravity (mGR) theories to show the limitations of these models' physical viability: Among their problems are loss of unique evolution, superluminal signals, matter coupling inconsistencies and micro-acausality (propagation of signals around local closed time-like curves (CTCs)/closed causal curves (CCCs)). We extend previous no-go results to the entire three-parameter range of mGR theories. It is also argued that bimetric models suffer a similar fate.
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