MAP-Fis Research Conference

Session

High Energy Physics & Cosmology III (Chair: Carlos Herdeiro, Universidade de Aveiro) - Sala Sousa Pinto, DM (11.2.6)

11 Oct 2024, 16:15

University of Aveiro

113. Self-interactions can (also) destabilize bosonic stars

Marco Brito (Universidade de Aveiro)

11/10/2024, 16:15

Contributed Talk (20 minutes)

We study the dynamical stability of Proca-Higgs stars, in spherical symmetry. These are solutions of the Einstein-Proca-Higgs model, which features a Higgs-like field coupled to a Proca field, both of which minimally coupled to the gravitational field. The corresponding stars can be regarded as Proca stars with self-interactions, while avoiding the hyperbolicity issues of self-interacting...

117. THE NON-SPHERICAL GROUND STATE OF PROCA STARS

Etevaldo dos Santos Costa Filho (Universidade de Aveiro)

11/10/2024, 16:35

Contributed Talk (20 minutes)

Spherical Proca Stars (PSs) are regarded as the ground state amongst the family of PSs. In accordance, spherical PSs are thought to have a fundamental branch of stable solutions.We provide energetic, morphological and dynamical evidence that spherical PSs are actually excited states. The ground state is shown to be a family of static, non-spherical, in fact prolate, PSs. The spherical stars in...

123. The Born regime of gravitational amplitudes

Filipe Miguel Martins Macedo Serrano Coelho

11/10/2024, 16:55

Contributed Talk (20 minutes)

We study the 2→2 scattering in the regime where the wavelength of the scattered objects is comparable to their distance but is much larger than any Compton wavelength in the quantum field theory. We observe that in this regime - which differs from the eikonal - the Feynman diagram expansion takes the form of a geometric series, akin to the Born series of quantum mechanics. Conversely, we can...

137. NRSurNN3dq4: A Deep Learning Powered Numerical Relativity Surrogate for Binary Black Hole Waveforms

Osvaldo Freitas (University of Minho)

11/10/2024, 17:15

Contributed Talk (20 minutes)

Gravitational wave approximants are extremely useful tools in gravitational wave astronomy. By skipping the full evolution of numerical relativity waveforms, their usage allows for dense coverage of the parameter space of binary black hole (BBH) mergers for purposes of parameter inference, or, more generally, match filtering tasks. However, these benefits come at a slight cost to accuracy when...

138. TBounce: gravitational wave computations for primordial phase transitions

Mr Marco Marco Finetti (Aveiro University)

11/10/2024, 17:35

Contributed Talk (20 minutes)

The baryon asymmetry problem remains a crucial challenge in particle physics and cosmology. Electroweak baryogenesis, a leading mechanisms to produce the matter-antimatter asymmetry we observe today, requires an extension to the Standard Model to achieve a sufficiently strong first order phase transition.
Besides representing a target for several future-generation colliders, such Beyond the...