Stochastic background of gravitational waves from turns in the landscape @LISAcommunity

Uploaded August 2020 | Updated September 2026, 3 hours ago

Stochastic background of gravitational waves from turns in the landscape

Jacopo Fumagalli,Sebastien Renaux-Petel,Lukas Witkovski

We have recently proposed a new model-independent mechanism for producing primordial black holes from a period of multi-ﬁeld inﬂation. The desired enhancement of primordial ﬂuctuations at short scales naturally occurs when the inﬂationary trajectory exhibits a strong turn, that is a limited period during which the trajectory strongly deviates from a geodesic in ﬁeld space. The mechanism, independently of being able to account for all or a fraction of dark matter in the form of primordial black holes, has the potential of exhibiting unique features accessible to observation through a stochastic background of gravitational waves. The peculiar features in the induced gravitational waves spectrum, such as characteristic peaks and oscillating patterns, oﬀers the possibility to link the microscopic dynamics of inﬂation with the gravitational waves energy density potentially detectable by LISA.

$Stochastic background of gravitational waves from turns in the landscape Stochastic background of gravitational waves from turns in the landscape Jacopo Fumagalli,Sebastien Renaux-Petel,Lukas Witkovski We have recently proposed a new model-independent mechanism for producing primordial black holes from a period of multi-ﬁeld inﬂation. The desired enhancement of primordial ﬂuctuations at short scales naturally occurs when the inﬂationary trajectory exhibits a strong turn, that is a limited period during which the trajectory strongly deviates from a geodesic in ﬁeld space. The mechanism, independently of being able to account for all or a fraction of dark matter in the form of primordial black holes, has the potential of exhibiting unique features accessible to observation through a stochastic background of gravitational waves. The peculiar features in the induced gravitational waves spectrum, such as characteristic peaks and oscillating patterns, oﬀers the possibility to link the microscopic dynamics of inﬂation with the gravitational waves energy density potentially detectable by LISA.$

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