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Simulating the quartic Galileon gravity model on adaptively refined meshes

Artykuł
Czasopismo : JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   Zeszyt: 11, Strony: 1-41
Li Baojiu [1] , Alexandre Barreira [1] , [2] , Carlton Baugh [1] , Wojciech Hellwing [1] , [3] , Kazuya Koyama [4] , Silvia Pascoli [2] , Gong-Bo Zhao [4] , [5]
  • [1]
    Institute for Computational Cosmology, Department of Physics, Durham University, Durham DH1 3LE, U.K
  • [2]
    Institute for Particle Physics Phenomenology, Department of Physics, Durham University, Durham DH1 3LE, U.K
  • [3]
  • [4]
    Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, U.K.
  • [5]
    National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China
2013 angielski
Link do publicznie dostępnego pełnego tekstu
Identyfikatory
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Cechy publikacji
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  • Oryginalny artykuł naukowy
  • Zrecenzowana naukowo
Tłumaczenie tytułu
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Symulacje modelu grawitacji Galileon 4-go rzędu na adaptywnych zagęszczanych siatkach
Dyscypliny naukowe
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Astronomia , Fizyka
Słowa kluczowe
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Abstrakty ( angielski )
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We develop a numerical algorithm to solve the high-order nonlinear derivative-coupling equation associated with the quartic Galileon model, and implement it in a modified version of the ramses N-body code to study the effect of the Galileon field on the large-scale matter clustering. The algorithm is tested for several matter field configurations with different symmetries, and works very well. This enables us to perform the first simulations for a quartic Galileon model which provides a good fit to the cosmic microwave background (CMB) anisotropy, supernovae and baryonic acoustic oscillations (BAO) data. Our result shows that the Vainshtein mechanism in this model is very efficient in suppressing the spatial variations of the scalar field. However, the time variation of the effective Newtonian constant caused by the curvature coupling of the Galileon field cannot be suppressed by the Vainshtein mechanism. This leads to a significant weakening of the strength of gravity in high-density regions at late times, and therefore a weaker matter clustering on small scales. We also find that without the Vainshtein mechanism the model would have behaved in a completely different way, which shows the crucial role played by nonlinearities in modified gravity theories and the importance of performing self-consistent N-body simulations for these theories.
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