Speaker
Mr
Ippei Obata
(Department of Physics, Kyoto University)
Description
An inflationary universe predicts vacuum fluctuations of space-time, called primordial gravitational waves, whose power spectra have tiny amplitudes and parity-symmetric features. Intriguingly, however, it is known that the axion-gauge coupling, motivated by string theory, could occur the particle production of gauge fields during inflation so that it provides the parity-violated gravitational waves testable in future gravitational wave experiments.
In this talk, we suggest a new mechanism of providing chiralities of gravitational waves sourced by the axion-gauge couplings from string theory. The gravitational waves predicted by our model could be observable by future space-based interferometers such as BBO and DECIGO experiments.
Primary author
Mr
Ippei Obata
(Department of Physics, Kyoto University)
