Covariant quantum field theory of tachyons 2024 P1Covariant quantum field theory of tachyons 2024 P2Covariant quantum field theory of tachyons 2024 P3Covariant quantum field theory of tachyons 2024 P4Covariant quantum field theory of tachyons 2024 P5Covariant quantum field theory of tachyons 2024 P6Covariant quantum field theory of tachyons 2024 P7