IberiCos 2025

Session

Session 2 - Phase Transitions & Topological Defects

14 Apr 2025, 11:30

Auditorium C.1

Conveners

Session 2 - Phase Transitions & Topological Defects

• Session convener: Chris Byrnes

55. Structure Formation From Cosmic Domain Wall Collapses

Clara Winckler

14/04/2025, 11:30

Talk

A series of symmetry-breaking phase transitions in the early universe is expected to have caused the formation of networks of sheet-like topological defects called domain walls, whose collapse could leave observable imprints in current-day massive non-linear structures. We use the parameter-free version of the velocity-dependent one-scale model to provide an estimate of their decay energy,...

41. Domain wall evolution beyond quartic potentials: The Sine-Gordon and Christ-Lee potentials

Ricarda Heilemann

14/04/2025, 11:45

Talk

Domain walls are the simplest type of topological defects formed at cosmological phase transitions, and one of the most constrained. These analyses typically assume a quartic double well potential, but this model is not fully representative of the range of known or plausible particle physics models. Here we study the cosmological evolution of domain walls in two other classes of potentials....

54. Analytical Methods for Realistic Cosmic Strings and Superstrings

Pedro Belo Barbosa (University of Porto)

14/04/2025, 12:00

Talk

The CVOS model is a thermodynamical framework designed to describe the evolution of a network of current‐carrying cosmic strings, where energy loss due to loop formation is incorporated phenomenologically. In this work, I investigate the stability of these configurations by analytically manipulating and examining the microscopic equations of the model. Subsequently, I analyze the evolution of...

56. Preliminary evaluation of GVOS model parameters on the asymptotic solutions for current carrying cosmic strings networks evolution

Francisco Pimenta

14/04/2025, 12:15

Talk

Cosmic strings arise naturally in both unifying theories and superstring inspired inflation models, in which case the fundamental strings formed in the very early universe may have stretched to macroscopic scales.
To better understand the underlying physical mechanisms and how the macroscopical properties of such networks evolve, analytical developments are needed. In this work, we have...

61. Analytical approximations to the stochastic gravitational wave background from cosmic strings with friction

Mr Sergei Mukovnikov (Institute of Astrophysics, Centre for Astrophysics of the University of Porto)

14/04/2025, 12:30

Talk

Cosmic strings can be produced during phase transitions in the very
early universe. They are particularly interesting objects since they
emit gravitational waves contributing to the stochastic gravitational
wave background (SGWB). This gives us possibility to connect
gravitational waves experiments to unknown physics scenarios of the very
distant past. In the early stages of cosmic string...