Stability of strange dwarfs II. Computational results |
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| Authors: | Yu L Vartanyan G S Hajyan A K Grigoryan T R Sarkisyan |
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| Institution: | (1) Department of Applied Physics, Faculty of Sciences, University of Alicante, Apartado de Correos 99, 03080 Allicante, Spain |
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| Abstract: | The stability of strange dwarfs for quark cores with M
0core
/M
⨀ = 10−4, has been studied by calculating, in each individual case, a series of strange dwarfs with configurations in which 5 ⋅ 10−4, 10−3, 5 ⋅ 10−3, 10−2, 1.31 ⋅ 10−2, 1.6 ⋅ 10−2, 1.7 ⋅ 10−2, 2 ⋅ 10−2, ranges from the values in white dwarfs to ρ
drip
= 4.3 ⋅ 1011 g/cm3, at which free neutrons are produced in the crust. For the series with M
0core
/M
⨀ < 0.0131, stability is lost when ρ
tr
< ρ
drip
. For the series with M
0core
/M
⨀ > 0.0131, the equality ρ
tr
= ρ
drip
is reached before the strange dwarf attains its maximum mass. Although the frequency of the radial pulsations in the fundamental
mode obeys ω02 > 0 for these configurations, they are unstable with respect to transitions into a strange star state with the same total
number of baryons and a radius on the order of that of neutron stars. An energy on the order of the energy in a supernova
explosion is released during these transitions. It is shown that the gravitational red shift of white and strange dwarfs are
substantially different for low and limiting (high) masses. |
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| Keywords: | |
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