In Phys .
Rev .
D 98 , 103023 ( 2018 ) , a novel scenario was proposed to probe the interactions between dark matter ( DM ) particles and electrons , via hydrogen-atmosphere pulsating white dwarfs ( DAVs ) in globular clusters .
The estimation showed that the scenario could hopefully test the parameter space : 5 \mathrm { GeV } \lesssim m _ { \chi } \lesssim 10 ^ { 4 } \mathrm { GeV } and \sigma _ { \chi,e } \gtrsim 10 ^ { -40 } \mathrm { cm } ^ { 2 } , where m _ { \chi } is the DM particle ’ s mass and \sigma _ { \chi,e } is the elastic scattering cross section between DM and electron .
In this comment , we have determined the exact lower limit of the testable DM particle mass \sim 1.38 - 1.58 \mathrm { GeV } , which depends on \sigma _ { \chi,e } .
This gives us a credible lower limit of the testable DM particle mass in above scenario , and provide a clear upper limit of the DM particle mass which we should consider in future research .