RT Journal Article
T1 Gravitational leptogenesis from metric perturbations
A1 López Maroto, Antonio
A1 Delgado Miravet, Alfredo
AB In this work, we make the observation that the gravitational leptogenesis mechanism can be implemented without invoking new axial couplings in the inflaton sector. We show that, in the perturbed Robertson-Walker background emerging after inflation, the spacetime metric itself breaks parity symmetry and generates a nonvanishing Pontryagin density which can produce a matter-antimatter asymmetry. We analyze the produced asymmetry in different inflationary and reheating scenarios. We show that the generated asymmetry can be locally comparable to observations in certain cases, although the size of the matter-antimatter regions is typically much smaller than the present Hubble radius.
PB Amer Physical Soc
SN 2470-0010
YR 2023
FD 2023-02-27
LK https://hdl.handle.net/20.500.14352/72138
UL https://hdl.handle.net/20.500.14352/72138
LA eng
NO © 2023 American Physical SocietyWe thank Sharma Ramkishor for helpful suggestions. We also thank the Physical Review referees for their insightful comments. This work has been supported by the MINECO (Spain) Project No. PID2019-107394 GB-I00 (AEI/Fondo Europeo de Desarrollo Regional, Union Europea) . A. D. M. acknowledges financial support by the MICIU (Spain) through Formacion de Profesorado Universitario (FPU) Fellowship No. FPU18/04599.
NO Ministerio de Economía y Competitividad (MINECO)/ FEDER
NO Ministerio de Ciencia e Innovación (MICINN)
DS Docta Complutense
RD 7 may 2024