Higher-derivative gravities admit globally smooth gravitational-wave solutions on Kundt backgrounds for suitable couplings, unlike Einstein gravity where such waves require singularities interpreted as sources.
(3.16)), it was possible to obtain all solutions in a closed form within this class
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Static spherically symmetric Kundt vacuum solutions of higher-derivative gravities
Higher-derivative gravities admit globally smooth gravitational-wave solutions on Kundt backgrounds for suitable couplings, unlike Einstein gravity where such waves require singularities interpreted as sources.