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Comments on the paper ``Bare Quark Surfacees of Strange Stars and Electron-Positron Pair Em

a r X

Comments on the paper ``Bare Quark Surfacees of Strange Stars and Electron-Positron Pair Em

Comments on the paper ``Bare Quark Surfacees of Strange Stars and Electron-Positron Pair Em

i v

Comments on the paper ``Bare Quark Surfacees of Strange Stars and Electron-Positron Pair Em

:a s t r o -p h /9802331v 3 22 J u l 1998

Comments on the paper “Bare Quark Matter Surfaces of Strange Stars and e +e −

Emission”

We would like to point out here that although the idea

expressed in the above mentioned paper [1]that the bare

surface of a hot strange star may be a strong source of

e +e −pairs o

f luminosity L e ±∼3×1051ergs s −1for a

duration of ∼10s appears to be novel and exciting,it

is,unfortunately,unlikely to work because of several rea-

sons.It is true that,it has already been hypothesesized

by previous authors [2]that the bare surface of a strange

star may be endowded with a superstrong electrostatic

field of magnitude E ∼5×1017V cm −1∼1.5×1013stat-

volt cm −1.Although such estimates,in general,could be

fairly uncertain,let us momentarily assume that there is

indeed such a field on the surface of the strange star over

a height of ∆R ∼10−10cm.As correctly envisaged in

ref.1,such a strong value of E >>E cr =1.3×1016V

cm −1is likely to convert the virtual pairs of the QED

vacuum into real ones,i.e,create real e +e −pairs.Let

us consider the region of the electric field as a parallel

plate capacitor.The maximum value of the total energy

liberated by the discharge of the capacitor,in the form

of pairs and photons,would be the stored electrostatic

energy of the capacitor :

W s =E 2

[1]http://www.sodocs.net/doc/2de0928bd0d233d4b14e6972.html ov,PRL,80,230(1998).

[2]C.Alcock &A.Olinto,Ann.Rev.Part.Sci.,38,161

(1988).

[3]R.F.Sawer &A.Soni,Astrophys.J.,230,850(1979)

[4]P.Haensel,B.Paczynski,&P.Amsterdamski,Astrophys.

J.,375,209(1991).

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