Global ETD Search
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Showing 1 to 2 of 2 for “"Massive Mode"”.
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Ghost and tachyon free gauge theories of gravity: A systematic approach
… and clarify the treatment of non-propagating modes in determining whether a theory is power-counting renormalisable (PCR) in Chapter 5. We identify 58 of the ghost and tachyon free PGT$^+$ critical cases that are also PCR, of which seven have 2 massless degrees of freedom (d.o.f.) in …
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Exploring linear and nonlinear electromagnetic responses in topological materials
… and contemplate the possible collective phonon modes mediating these responses. We consider the onset of the phase-modulating (massless) collective modes and amplitude-modulating (massive) collective modes in these responses. We find that the tilted Weyl-charge-density wave model can yield …