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k-Mouflage gravity
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We introduce a large class of scalar-tensor theories where gravity becomes stronger at large distances via the exchange of a scalar that mixes with the graviton. At small distances, i.e. large curvature, the scalar is screened via an analog of the Vainshtein mechanism of massive gravity. The crossover distance between the two regimes can be made cosmological by an appropriate choice of the parameters.
Forward citations
Cited by 6 Pith papers
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Diffeomorphic Scalar Duality
Every local scalar EFT admits a duality to an infinite class of other scalar theories via field-dependent diffeomorphisms preserving the S-matrix, extending to gravity in Einstein-Cartan formalism.
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Screened Axio-dilaton Cosmology: Novel Forms of Early Dark Energy
A screened axio-dilaton dark energy model produces a self-terminating early dark energy phase from axion-matter couplings, reaching a few percent of the total density, and stronger dilaton-matter couplings decrease th...
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Cosmic strings in the complex symmetron model
In the complex symmetron model, cosmic strings attach to dense halos, and loops pinned by several halos can be stabilized instead of collapsing.
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Modelling the matter bispectrum at small scales in modified gravity
No existing matter-bispectrum model is accurate enough for Stage IV lensing surveys across the tested modified gravity theories, and a halo-model-corrected fitting formula is the most accurate option tested.
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The Status of Single Scalar Field Dark Energy
Cosmological data can constrain only a handful of EFT parameters for single-scalar dark energy; extended models show modest preference over Λ but remain underdetermined and challenged by fifth forces and screening.
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Galaxy formation in modified gravity -- II. galaxy halo connection and assembly bias
Simulations in f(R) gravity show that environment density in the HOD model reduces assembly bias effects to 2-3% at z≲0.5 in both ΛCDM and modified gravity.
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