Adiabatic regularization of the graviton stress-energy tensor in de Sitter space-time

Journal Article · Sat Jan 15 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.023522· OSTI ID:20705813

Finelli, F; Marozzi, G; Vacca, G P; Venturi, G ^[1]

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1. CNR-INAF/IASF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Bologna, Via Gobetti 101, I-40129 Bologna (Italy)

We study the renormalized energy-momentum tensor of gravitons in a de Sitter space-time. After canonically quantizing only the physical degrees of freedom, we adopt the standard adiabatic subtraction used for massless minimally coupled scalar fields as a regularization procedure and find that the energy density of gravitons in the E(3) invariant vacuum is proportional to H{sup 4}, where H is the Hubble parameter, but with a positive sign. According to this result the scalar expansion rate, which is gauge invariant in de Sitter space-time, is increased by the fluctuations. This implies that gravitons may then add to conformally coupled matter in driving the Starobinsky model of inflation.

• OSTI ID: 20705813
• Journal Information: Physical Review. D, Particles Fields, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevD.71.023522; (c) 2005 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
COSMOLOGY
DE SITTER GROUP
DEGREES OF FREEDOM
ENERGY DENSITY
ENERGY-MOMENTUM TENSOR
FLUCTUATIONS
GAUGE INVARIANCE
GRAVITONS
INFLATIONARY UNIVERSE
QUANTUM GRAVITY
SCALAR FIELDS
SPACE-TIME
STRESSES