Lagrangian description of perfect fluids and modified gravity with an extra force

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.124040· OSTI ID:21316540

Faraoni, Valerio ^[1]

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1. Physics Department, Bishop's University Sherbrooke, Quebec, J1M 1Z7 (Canada)

We revisit the issue of the correct Lagrangian description of a perfect fluid (L{sub 1}=P versus L{sub 2}=-{rho}) in relation with modified gravity theories in which galactic luminous matter couples nonminimally to the Ricci scalar. These Lagrangians are only equivalent when the fluid couples minimally to gravity and not otherwise; in the presence of nonminimal coupling they give rise to two distinct theories with different predictions.

• OSTI ID: 21316540
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 12; Other Information: DOI: 10.1103/PhysRevD.80.124040; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING
FLUIDS
FORECASTING
GRAVITATION
IDEAL FLOW
LAGRANGIAN FUNCTION
MATTER