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  1. We consider theories describing the dynamics of a four-dimensional metric, whose Lagrangian is diffeomorphism invariant and depends at most on second derivatives of the metric. Imposing degeneracy conditions we find a set of Lagrangians that, apart form the Einstein-Hilbert one, are either trivial or contain more than two degrees of freedom. Among the partially degenerate theories, we recover ...
    Author:Marco Crisostomi, Karim Noui, Karim Noui, Christos Charmousis, David LangloisPublished:2018
  2. journals.aps.org

    higher order Euler-Lagrange equations, the reverse is not true. A prime example is the one of scalar-tensor theories beyond Horndeski which were introduced in [4,5] and also studied in [6-9]. Later, these theories were further under-stood and generalized under the degeneracy criterion [10]. Basically, a higher order scalar-tensor theory still ...
  3. journals.aps.org

    We consider theories describing the dynamics of a four-dimensional metric, whose Lagrangian is diffeomorphism invariant and depends at most on second derivatives of the metric. Imposing degeneracy conditions we find a set of Lagrangians that, apart form the Einstein-Hilbert one, are either trivial or contain more than 2 degrees of freedom. Among the partially degenerate theories, we recover ...
    Author:Marco Crisostomi, Karim Noui, Karim Noui, Christos Charmousis, David LangloisPublished:2018
  4. researchgate.net

    arXiv:1710.04531v1 [hep-th] 12 Oct 2017 Beyond Lovelock: on higher derivative metrictheories M. Crisostomi,1 K. Noui,2,3 C. Charmousis,4 and D. Langlois3 1Institute of Cosmology and Gravitation ...
  5. journals.aps.org

    Feb 21, 2023higher-derivative theories and their applicability in 3D Lovelock gravity. We end our paper with a summary of our results in Sec. V. II.c-THEOREMINLOVELOCKGRAVITYIND > 6 AND ITS NAIVE LIMIT TO D=3 We will construct a holographic c-function for the cubic Lovelock gravity in D>6 by the method of [37]. The action that we consider is as follows: S ...
  6. other higher derivative theories. In order to do this, we will split the thesis into two parts. The first half of the thesis (chapter 2-4) is dedicated to explaining different higher order derivative theories that give at most second order field equation and the relation between them.
  7. link.springer.com

    D. Langlois and K. Noui, Degenerate higher derivative theories beyond Horndeski: evading the Ostrogradski instability, JCAP 02 (2016) 034 [arXiv:1510.06930] . Article ... Beyond Lovelock gravity: Higher derivative metric theories, Phys. Rev. D 97 (2018) 044034 [arXiv:1710.04531] .

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