Parity violating gravitational waves at the end of inflation Bastero Gil, Mar Torres Manso, António Gravitational waves / sources Inflation Particle physics-cosmology connection Primordial gravitational waves (theory) This work has been partially supported by MICINN (PID2019-105943GB- I00/AEI/10.13039/501100011033) and “Junta de Andalucía” grant P18-FR-4314. ATM is supported by FCT grant SFRH/BD/144803/2019. Inflaton-vector interactions of the type ϕFF~ have provided interesting phenomenology to tackle some of current problems in cosmology, namely the vectors could constitute the dark matter component. It could also lead to possible signatures imprinted in a gravitational wave spectrum. Through this coupling, a rolling inflaton induces an exponential production of the transverse polarizations of the vector field, having a maximum at the end of inflation when the inflaton field velocity is at its maximum. These gauge particles, already parity asymmetric, will source the tensor components of the metric perturbations, leading to the production of parity violating gravitational waves. In this work we examine the vector particle production with an attempt to mimic its backreaction effects on the inflation evolution in the weak coupling regime. Furthermore, we fully integrate the gauge particle amplitudes spectrum during this production epoch, studying the behavior until the end of reheating. Finally, we calculate the gravitational wave spectrum solely relying on the vector mode WKB expansion in its regime of validity. 2023-10-02T09:34:33Z 2023-10-02T09:34:33Z 2023-08-01 info:eu-repo/semantics/article Submitted Version: Mar Bastero-Gil and António Torres Manso. Parity violating gravitational waves at the end of inflation. JCAP08(2023)001. [DOI 10.1088/1475-7516/2023/08/001] https://hdl.handle.net/10481/84757 10.1088/1475-7516/2023/08/001 eng http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Atribución 4.0 Internacional Institute of Physics