The Cosmology seminars are weekly seminars dedicated to Cosmology and Astroparticle Physics. Please write to the contact below to join the mailing list to be updated on upcoming seminars.
We have both remote and on-site seminars going forward.
Time: Wednesdays 14:15-15:15 Helsinki time, unless otherwise noted.
Remote: Zoom invitations will be sent out on the Cosmology seminars mailing list.
On-site: Physicum A315 (will be streamed in Zoom)
Format: 45′ + 15′
Contact: Tushar Gupta (tushar.gupta@helsinki.fi)
Scheduled Seminars
- 04.02.2026 Claudio Grillo (University of Milan), (Onsite)
Title: TBA
Abstract: TBA - 11.03.2026 Katherine Freese (University of Texas), (Remote)
Title: TBA
Abstract: TBA
Spring Term 2026
- 14.01.2026 José Correia (University of Oslo), (Onsite)
Title: Gravitational waves from strong first order phase transitions [video]
Abstract: Multiple extensions of the Standard Model of particle physics predict the existence of first order phase transitions occurring in the early Universe, leading to an imprint in the stochastic background of gravitational waves. When the transition occurs at the electroweak scale, this imprint will be in the expected range of LISA. In this talk we explore the gravitational wave production of strong first order phase transitions, seeking to understand the role of fluid non-linearities and their impact on the expected signal. To do so, we employ large scale simulations of two transitions: one preceded by a detonation, another by a deflagration. We then study the evolution of vortical and compressional modes, how they are intrinsically related and what their respective impacts are on the expected gravitational wave background signal. We also study the relationship of the rate of emission of gravitational wave power with non-linear decay of flow.
- DD.MM.YYYY
Title:
Abstract: