2011/06/29 by Ernst Trojan, Trojan, Ernst, George V. Vlasov +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum, superfluid, helium dynamics #astro-ph.CO #hep-ph
paper · pdf · doi:10.48550/arxiv.1106.5857
11 pages, 4 figures
openalex publication_date 2011/06/29 · arxiv created 2011/10/08 · arxiv updated 2015/03/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider an ideal Fermi gas of tachyonic thermal excitations as a continuous medium and establish when it satisfies the causality condition. At high temperature the sound speed is always subluminal cs<1, but there is no stable form of tachyon matter below the critical temperature Tc<0.23m that depends on the tachyon mass m. The pressure P and energy density E cannot be arbitrary small, but P can exceed E, and P=2.36E when T→ Tc.