Linear cosmological perturbations in scalar-tensor-vector gravity

• Verfasst von: Jamali, Sara [VerfasserIn]
• Verfasst von: Roshan, Mahmood [VerfasserIn]
• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Linear cosmological perturbations in scalar-tensor-vector gravity
• Verf.angabe: Sara Jamali, Mahmood Roshan, Luca Amendola
• E-Jahr: 2020
• Jahr: 20 January 2020
• Umfang: 7 S.
• Illustrationen: Diagramme
• Fussnoten: Gesehen am 20.04.2020
• Titel Quelle: Enthalten in: Physics letters / B
• Ort Quelle: Amsterdam : North-Holland Publ., 1967
• Jahr Quelle: 2020
• Band/Heft Quelle: 802(2020) Artikel-Nummer 135238, Seite 1-7
• ISSN Quelle: 1873-2445
• DOI: doi:10.1016/j.physletb.2020.135238
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Dark matter
• Sach-SW: Linear perturbations
• Sach-SW: Modified gravity
• Sach-SW: Scalar-tensor-vector gravity
• Sach-SW: Structure formation
• K10plus-PPN: 1694963160

Abstract

We investigate the cosmological perturbations in the context of a Scalar-Tensor-Vector theory of Gravity known as MOG in the literature. Recent investigations show that MOG reproduces a viable background cosmological evolution comparable to ΛCDM. However, the matter dominated era is slightly different. In this paper, we study the linear matter perturbations and estimate the relevant modified gravity parameters. We show that MOG reduces the growth rate of the perturbations and comparing with the RSD data reveals that MOG suggests a higher value for σ8, compare to ΛCDM. This point, constitute a powerful challenge to the cosmological viability of MOG.