Gravity Models with Nonlinear Symmetry Realization
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Validity of three gravity models with non-linear realization of conformal symmetry previously discussed in literature is addressed. Two models are found to be equivalent up to a change of coset coordinates. It was found that models contain ghost degrees of freedom that may be excluded by an introduction of an additional symmetry to the target space. One model found to be safe in early universe. The others found to lack spin-2 degrees of freedom and to have peculiar coupling to matter degrees of freedom.
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2012 ◽
Vol 445
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pp. 917-922
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1973 ◽
Vol 187
(1)
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pp. 787-794
1977 ◽
Vol 12
(6)
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pp. 339-353
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1991 ◽
Vol 06
(05)
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pp. 737-748
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2001 ◽
pp. 320-323
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1998 ◽
Vol 212
(6)
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pp. 459-465
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2014 ◽
Vol 29
(31)
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pp. 1450167
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