Antimatter and antistars in the Universe and in the Galaxy

作者：Blinnikov S I^*; Dolgov A D; Postnov K A

来源：PHYSICAL REVIEW D, 2015, 92(2): 023516.

DOI：10.1103/PhysRevD.92.023516

Possible existence of baryo-dense (BD) stars and antistars, which might be created in the very early Universe in the frameworks of a slightly modified Affleck-Dine scenario of baryogenesis is studied. We discuss phenomenology, observational manifestations, and bounds on such antistars and show that they are allowed to be abundant in the Galaxy. New constraints on the possible number of compact antimatter objects are derived. We point out that explosion of an antistar as a type Ia supernova produces a remnant with relatively low annihilation signal. Another important conclusion is the strong reduction of the annihilation flux from antistars in the gaseous disk of the Galaxy due to the high velocities of BD stars in general, and antistars in particular. The contemporary observational data do not exclude significant amount of antimatter in the Galaxy (and in other galaxies) in the form of the BD stars with relatively low mass.

• 出版日期2015-7-13