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Roman Pasechnik

Senior lecturer

Typical working day..

Multi-peaked signatures of primordial gravitational waves from multi-step electroweak phase transition


  • António P. Morais
  • Roman Pasechnik
  • Thibault Vieu

Summary, in English

The first-order electroweak phase transition in the early universe could occur in multiple steps leading to specific multi-peaked signatures in the primordial gravitational wave (GW) spectrum. We argue that these signatures are generic phenomena in multi-scalar extensions of the Standard Model. In a simple example of such an extension, we have studied the emergence of reoccuring and nested vacuum bubble configurations and their role in the formation of multiple peaks in the GW spectrum. The conditions for potential detectability of these features by the forthcoming generation of interferometers have been studied.


  • Theoretical Particle Physics

Publishing year





Proceedings of Science



Document type

Conference paper


  • Astronomy, Astrophysics and Cosmology

Conference name

2019 European Physical Society Conference on High Energy Physics, EPS-HEP 2019

Conference date

2019-07-10 - 2019-07-17

Conference place

Ghent, Belgium




  • ISSN: 1824-8039