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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231424
Weak Interactions as a mechanism against Gravitational Collapse in Primordial Baryonic Stars
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This work investigates whether weak interactions mediated by Z-boson exchange can provide a stabilising pressure against gravitational collapse (GC) in primordial baryonic stars.
Building on previous works, we completed the equation of state by incorporating the degeneracy pressure of an ultra-relativistic fermionic gas. A crossover density 𝑛* ≈ 9 · 1010 fm−3 is identified, marking the transition between weak-interaction-dominated and degeneracy-dominated regimes.
The Tolman-Oppenheimer-Volkoff equation is solved numerically with a boundary condition derived from the thermal radiation pressure of the primordial plasma, yielding a universal stellar radius of approximately 15 meters. Stability analysis via the turning point theorem reveals that all stable configurations have central densities well below the crossover density, demonstrating that weak interactions do not play a relevant structural role in these compact objects.
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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2026, Tutor: Domènec Espriu
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LAMPURLANÉS ROSELL, Joan. Weak Interactions as a mechanism against Gravitational Collapse in Primordial Baryonic Stars. [consulted: 16 of September of 2026]. Available at: https://hdl.handle.net/2445/231424