Reduction of the Mass of the Proto-Quark Star during Cooling

• Main Author: Gevorg Hajyan
• Format: Article
• Language: English
• Published: MDPI AG 2021-01-01
• Series: Particles
• Subjects: proto-quark stars; maximum temperature; mass reduction
• Online Access: https://www.mdpi.com/2571-712X/4/1/4
• ISSN: 2571-712X

The integral parameters (mass, radius) of hot proto-quark stars that are formed in supernova explosion are studied. We use the MIT bag model to determine the pressure of up-down and strage quark matter at finite temperature and in the regime where neutrinos are trapped. It is shown that such stars are heated to temperatures of the order of tens of MeV. The maximum possible values of the central temperatures of these stars are determined. It is shown that the energy of neutrinos that are emitted from proto-quark stars is of the order of <inline-formula><math display="inline"><semantics><mrow><mn>250</mn><mo>÷</mo><mn>300</mn></mrow></semantics></math></inline-formula> MeV. Once formed, the proto-quark stars cool by neutrino emission, which leads to a decrease in the mass of these stars by about 0.16–0.25 <inline-formula><math display="inline"><semantics><msub><mi>M</mi><mo>⊙</mo></msub></semantics></math></inline-formula> for stars with the rest masses that are in the range <inline-formula><math display="inline"><semantics><mrow><msub><mi>M</mi><mi>b</mi></msub><mo>=</mo><mn>1</mn><mo>.</mo><mn>22</mn><mo>−</mo><mn>1</mn><mo>.</mo><mn>62</mn><msub><mi>M</mi><mo>⊙</mo></msub></mrow></semantics></math></inline-formula>.