Gauge-invariant definition of gravitational radiation in Robertson-Walker cosmologies

Journal Article · Thu Apr 15 00:00:00 EST 1982 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.25.2049· OSTI ID:5496708

Niedra, J M

Gauge-invariant quantities are introduced which relate directly to the ideal fluid perturbations in Robertson-Walker backgrounds. It is shown how the vanishing of these gauge invariants is equivalent to the definition of purely radiative perturbations found in some early works. If one imposes a regularity condition, then the vanishing of just four gauge invariants is sufficient to define the condition of no perturbation of matter. The latter result is used to clarify the relationship to Hawking's definition of gravitational radiation.

• Research Organization: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
• OSTI ID: 5496708
• Journal Information: Phys. Rev. D; (United States), Vol. 25:8
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GRAVITATIONAL RADIATION
GAUGE INVARIANCE
COSMOLOGICAL MODELS
EINSTEIN FIELD EQUATIONS
METRICS
PERTURBATION THEORY
SPACE-TIME
EQUATIONS
FIELD EQUATIONS
INVARIANCE PRINCIPLES
MATHEMATICAL MODELS
RADIATIONS
640106* - Astrophysics & Cosmology- Cosmology
645400 - High Energy Physics- Field Theory