Seminarium "Teoria cząstek elementarnych i kosmologia"

In this talk I will discuss various aspects of the appearance of bubbles during a first-order phase transition in the early Universe. I will explain why their velocity is crucial for physical observations and how to estimate it. I will also discuss a background of gravitational waves resulting from collisions of bubbles on the example of a model with classical conformal symmetry. The talk will be based on the following articles 1809.11129 and 2005.10875.
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