Outputs (23)

Perturbative effective field theory expansions for cosmological phase transitions (2024)
Journal Article
Gould, O., & Tenkanen, T. V. I. (2024). Perturbative effective field theory expansions for cosmological phase transitions. Journal of High Energy Physics, 2024, Article 48. https://doi.org/10.1007/JHEP01%282024%29048

Guided by previous non-perturbative lattice simulations of a two-step electroweak phase transition, we reformulate the perturbative analysis of equilibrium thermodynamics for generic cosmological phase transitions in terms of effective field theory (... Read More about Perturbative effective field theory expansions for cosmological phase transitions.

BubbleDet: a Python package to compute functional determinants for bubble nucleation (2023)
Journal Article
Ekstedt, A., Gould, O., & Hirvonen, J. (2023). BubbleDet: a Python package to compute functional determinants for bubble nucleation. Journal of High Energy Physics, 2023(12), Article 56. https://doi.org/10.1007/jhep12%282023%29056

We present a Python package BubbleDet for computing one-loop functional determinants around spherically symmetric background fields. This gives the next-to-leading order correction to both the vacuum decay rate, at zero temperature, and to the bubble... Read More about BubbleDet: a Python package to compute functional determinants for bubble nucleation.

Higher orders for cosmological phase transitions: a global study in a Yukawa model (2023)
Journal Article
Gould, O., & Xie, C. (2023). Higher orders for cosmological phase transitions: a global study in a Yukawa model. Journal of High Energy Physics, 2023(12), Article 49. https://doi.org/10.1007/jhep12%282023%29049

We perform a state-of-the-art global study of the cosmological thermal histories of a simple Yukawa model, and find higher perturbative orders to be important for determining both the presence and strength of strong first-order phase transitions. Usi... Read More about Higher orders for cosmological phase transitions: a global study in a Yukawa model.

Cosmology with the Laser Interferometer Space Antenna (2023)
Journal Article
Auclair, P., Bacon, D., Baker, T., Barreiro, T., Bartolo, N., Belgacem, E., …Zhdanov, V. I. (2023). Cosmology with the Laser Interferometer Space Antenna. Living Reviews in Relativity, 26, Article 5. https://doi.org/10.1007/s41114-023-00045-2

The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early universe and... Read More about Cosmology with the Laser Interferometer Space Antenna.

Opportunities for new physics searches with heavy ions at colliders (2023)
Journal Article
d’Enterria, D., Drewes, M., Giammanco, A., Hajer, J., Bratkovskaya, E., Bruce, R., …Upreti, A. (2023). Opportunities for new physics searches with heavy ions at colliders. Journal of Physics G: Nuclear and Particle Physics, 50(5), Article 050501. https://doi.org/10.1088/1361-6471/acc197

Opportunities for searches for phenomena beyond the Standard Model (BSM) using heavy-ions beams at high energies are outlined. Different BSM searches proposed in the last years in collisions of heavy ions, mostly at the Large Hadron Collider, are sum... Read More about Opportunities for new physics searches with heavy ions at colliders.

Early-Universe Model Building (2023)
Working Paper
Asadi, P., Bansal, S., Berlin, A., Co, R. T., Croon, D., Cui, Y., …Yu, H. (2023). Early-Universe Model Building

Theoretical investigations into the evolution of the early universe are an essential part of particle physics that allow us to identify viable extensions to the Standard Model as well as motivated parameter space that can be probed by various experim... Read More about Early-Universe Model Building.

First-order electroweak phase transitions: A nonperturbative update (2022)
Journal Article
Gould, O., Güyer, S., & Rummukainen, K. (2022). First-order electroweak phase transitions: A nonperturbative update. Physical Review D, 106(11), Article 114507. https://doi.org/10.1103/physrevd.106.114507

We study first-order electroweak phase transitions nonperturbatively, assuming any particles beyond the Standard Model are sufficiently heavy to be integrated out at the phase transition. Utilizing high temperature dimensional reduction, we perform l... Read More about First-order electroweak phase transitions: A nonperturbative update.

Radiative first-order phase transitions to next-to-next-to-leading order (2022)
Journal Article
Ekstedt, A., Gould, O., & Löfgren, J. (2022). Radiative first-order phase transitions to next-to-next-to-leading order. Physical Review D, 106(3), Article 036012. https://doi.org/10.1103/PhysRevD.106.036012

We develop new perturbative tools to accurately study radiatively induced first-order phase transitions. Previous perturbative methods have suffered internal inconsistencies and been unsuccessful in reproducing lattice data, which is often attributed... Read More about Radiative first-order phase transitions to next-to-next-to-leading order.

Search for magnetic monopoles produced via the Schwinger mechanism (2022)
Journal Article
Acharya, B., Alexandre, J., Benes, P., Bergmann, B., Bertolucci, S., Bevan, A., …Vives, O. (2022). Search for magnetic monopoles produced via the Schwinger mechanism. Nature, 602(7895), 63-67. https://doi.org/10.1038/s41586-021-04298-1

Electrically charged particles can be created by the decay of strong enough electric fields, a phenomenon known as the Schwinger mechanism1. By electromagnetic duality, a sufficiently strong magnetic field would similarly produce magnetic monopoles,... Read More about Search for magnetic monopoles produced via the Schwinger mechanism.

Effective field theory approach to thermal bubble nucleation (2021)
Journal Article
Gould, O., & Hirvonen, J. (2021). Effective field theory approach to thermal bubble nucleation. Physical Review D, 104(9), Article 096015. https://doi.org/10.1103/PhysRevD.104.096015

The standard vacuum bounce formalism suffers from inconsistencies when applied to thermal bubble nucleation, for which ad hoc workarounds are commonly adopted. Identifying the length scales on which nucleation takes place, we demonstrate how the cons... Read More about Effective field theory approach to thermal bubble nucleation.