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Comment on Damping of Tensor Modes in Cosmology

We provide an analytic solution to the short wave length limit of the integro-differential equation describing the damping of the tensor modes of gravitational waves.

Commenton“DampingofTensorModesinCosmology”

DuaneA.Dicus1andWayneW.Repko2

1

2

CenterforParticlePhysics,UniversityofTexas,Austin,TX78712

(Dated:February5,2008)

DepartmentofPhysicsandAstronomy,MichiganStateUniversity,EastLansing,MI48824

Weprovideananalyticsolutiontotheshortwavelengthlimitoftheintegro-di erentialequationdescribingthedampingofthetensormodesofgravitationalwaves.

PACSnumbers:98.80.Cq,04.30.Nk

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Comment on Damping of Tensor Modes in Cosmology

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ph/0509096v2 12 Sep 2005

Inarecentpaper[1],Weinberggivesanintegro-di erentialequationforthepropagationofcosmologicalgravitationalwaves.Inparticularhewritesanequationfortheperturbationtothemetrichij(x,t)andthende nesχ(u)as

hij(u)=hij(0)χ(u),

whereuistheconformaltimemultipliedbythewavenumber

t

dt′

u=k

(1)

Electronic Electronic

address:dicus@physics.utexas.eduaddress:repko@pa.msu.edu

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