-
António Morais (Universidade de Aveiro)12/07/2024, 14:20
-
Prof. Orfeu Bertolami (Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto)12/07/2024, 14:30
We use the de Sitter Swampland Conjectures to test some inflationary models compatible with CMB data. We find that warm inflationary models, with one or more scalar fields, and the Claplygin-inspired models for some class of potentials satisfy the de Sitter Swampland Conjectures, Inflationary models in the context of theories of gravity that couple nonminimally curvature and matter are shown...
Go to contribution page -
Henrique Brito Câmara12/07/2024, 15:10
I will discuss our recent paper Phys.Rev.Lett. 132 (2024) 5, 051801, where we propose a generalized KSVZ-type axion framework in which coloured fermions and scalars act as two-loop Majorana neutrino-mass mediators. The global Peccei-Quinn symmetry under which exotic fermions are charged solves the strong CP problem. Within our general proposal, various setups can be distinguished by probing...
Go to contribution page -
Anca Preda12/07/2024, 16:20
In the realm of higher-dimensional grand unified theories (GUTs), the technique of orbifolding has emerged as a powerful tool to achieve spontaneous symmetry breaking by geometrical means. We use this tool to analyze the most general 5D GUT models based on the gauge groups SU(N), Sp(2N) and SO(N). We find a new physical consistency requirement, which these models have to satisfy in order to be...
Go to contribution page -
Prof. Alexander Belyaev (University of Southampton & Rutherford Appleton Laboratory)13/07/2024, 09:30
We suggest a new class of models - Fermionic Portal Vector Dark Matter (FPVDM) which extends the Standard Model (SM) with SU(2)_D dark gauge sector. While FPVDM does not require kinetic mixing and Higgs portal to explain Dark Matter (DM) phenomena. This framework is based on the Vector-Like (VL) fermionic doublet which couples the dark sector with the SM sector through the Yukawa interaction....
Go to contribution page -
Pedro Gabriel13/07/2024, 10:10
Pseudo-Nambu-Goldstone (pNG) dark matter models are popular for having a rich phenomenology and for being compatible with many existing observations. These models have the distinct feature of having negligible DM direct detection cross section at leading order, being that the first relevant contribution to the cross section comes from the one-loop electroweak corrections. These one-loop...
Go to contribution page -
Rui Santos (ISEL and CFTC-UL)13/07/2024, 11:20
The Large Hadron Collider is now running at a centre of mass energy of 13.6 TeV. I will present benchmark scenarios for a simple extension of the Standard Model: the complex two-Higgs doublet model (C2HDM) which allows for CP-violation in the scalar sector. I will present a number of benchmarks that show that in this model there are several ways to probe CP-violation in the different sectors...
Go to contribution page -
Mårten Bertenstam (Lund University)13/07/2024, 14:30
Dratopi is a helper tool under development for interfacing with python the recent Mathematica package DRalgo, by Ekstedt, Schicho and Tenkanen. The purpose is to provide a tool for studying phase transitions in the dimensional reduction formalism by combining DRalgo with phase transition packages (or modified versions thereof) like CosmoTransitions, by Carroll Wainwright. I will give an...
Go to contribution page -
Marco Finetti (Aveiro University)13/07/2024, 16:20
The electroweak phase transition is a promising explanation for the origin of baryon asymmetry in the universe, a core problem in cosmology and particle physics.
An extension of the Standard Model is necessary to generate a strong first-order phase transition. Besides representing a target for several future-generation colliders, such Beyond the Standard Model (BSM) theories can generate -...
Go to contribution page -
Danny Marfatia14/07/2024, 09:30
We perform a phenomenological comparison of the gravitational wave (GW) spectrum expected from cosmic gauge string networks and superstring networks comprised of multiple string types. We show how violations of scaling behavior and the evolution of the number of relativistic degrees of freedom in the early Universe affect the GW spectrum. We derive simple analytical expressions for the GW...
Go to contribution page -
Roman Pasechnik (Lund university)14/07/2024, 10:10
In this talk, I briefly overview recent progress in strong coupling dynamics at finite temperatures and its cosmological implications in SU(N) gauge theories, with and without fermions. In a confining pure Yang-Mills theory of dark sector, the scalar glueballs are considered as possible candidates for Dark Matter. To predict the relic abundance of glueballs for the various gauge groups and...
Go to contribution page -
Dr Andreas Mantziris (University of Porto)14/07/2024, 11:20
The study of interactions between dark matter and the Higgs field opens the interesting prospect of possible detection of dark matter (DM) through collider experiments. Naturally, this setup can have an impact on the features of DM itself, as well as to interfere with the spontaneous breaking of the electroweak symmetry. Furthermore, it is crucial that this Higgs-portal DM can be suitably...
Go to contribution page -
João Viana14/07/2024, 14:30
Strong first-order phase transitions (SFOPT) during the evolution of the Higgs potential in the early universe not only allow for the dynamical generation of the observed matter-antimatter asymmetry, they can also source a stochastic gravitational wave (GW) background possibly detectable with future space-based gravitational waves interferometers. As SFOPTs are phenomenologically incompatible...
Go to contribution page -
Oleg Lebedev15/07/2024, 09:30
I will discuss gravitational particle production in the early Universe and the consequent problems for the traditional concept of dark matter ``freeze-in''.
Go to contribution page -
Vinicius Oliveira15/07/2024, 10:10
We explore the implications of low reheating temperatures in the early Universe, focusing on scenarios where a minimal threshold of $4$ MeV is crucial to preserve the accuracy of Big Bang Nucleosynthesis (BBN) predictions. We specifically investigate the freeze-in mechanism, wherein scalar Dark Matter (DM) candidates are Boltzmann suppressed due to their mass exceeding the reheating...
Go to contribution page -
Rodrigo Capucha (CFTC)15/07/2024, 11:20
There are many extensions of the Standard Model with a dark matter (DM) candidate obtained via the freeze-out mechanism. It can happen that after all experimental and theoretical constraints are taken into account, all parameter points have a relic density below the experimentally measured value. This means that the models solve only partially the DM problem, and at least one more candidate is...
Go to contribution page -
Antonio Onofre (Universidade do Minho/CFUMUP,LIP)15/07/2024, 14:30
In this talk we will present our recent work on the studies of the LHC sensitivity to the detection of potential new boson mediators that couple to Dark Matter by looking into angular distributions in ttbar production at the LHC. We will show that no matter how hard and challenging the discover of New Physics is at the LHC, it is equally hard to remove the New Physics events in ttbar classical...
Go to contribution page -
João Pedro Pino Gonçalves (University of Aveiro)15/07/2024, 15:10
Despite the shortcomings of the Standard Model (SM), all experimental observations so far have not indicated the existence of new physics (NP) at or near the TeV scale. The gravitational channel is another promising avenue to test NP and can potentially probe particles with masses far beyond those accessible at current collider experiments. With this in mind, we perform a phenomenological...
Go to contribution page -
Ivo de Medeiros Varzielas (CFTP, IST, University of Lisbon)16/07/2024, 09:30
I will talk about Beyond Standard Model scenario where there is more than 1 Higgs doublet, and also additional symmetries to control the proliferation of free parameters.
Go to contribution page -
Mr Nuno Branco (University of Coimbra)16/07/2024, 10:10
We analyze the dynamics and observational signatures of axion clouds formed via the superradiant instability around primordial black holes, focusing on the mass range $10^{14}-10^{18}$ kg where the latter may account for all the dark matter.
Go to contribution page
We take into account the leading effects of axion self-interactions, showing that, even though these limit the number of axions produced within each... -
Miguel Barroso Varela16/07/2024, 11:00
The presently open problem of the Hubble tension is shown to be removed in the context of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave background data until their values from direct late-time measurements, we will show how to obtain an agreement between different experimental...
Go to contribution page -
Mr Sergei Mukovnikov (The Instituto de Astrofísica e Ciências do Espaço)16/07/2024, 11:30
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. 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 network...
Go to contribution page -
Pedro Gabriel
Pseudo-Nambu-Goldstone (pNG) dark matter models are popular for having a rich phenomenology and for being compatible with many existing observations. These models have the distinct feature of having negligible DM direct detection cross section at leading order, being that the first relevant contribution to the cross section comes from the one-loop electroweak corrections. These one-loop...
Go to contribution page -
António Morais (Universidade de Aveiro)
-
Miguel Barroso Varela
The presently open problem of the Hubble tension is shown to be removed in the context of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave background data until their values from direct late-time measurements, we will show how to obtain an agreement between different experimental...
Go to contribution page -
António Morais (Universidade de Aveiro)
-
Anca Preda
In the realm of higher-dimensional grand unified theories (GUTs), the technique of orbifolding has emerged as a powerful tool to achieve spontaneous symmetry breaking by geometrical means. We use this tool to analyze the most general 5D GUT models based on the gauge groups SU(N), Sp(2N) and SO(N). We find a new physical consistency requirement, which these models have to satisfy in order to be...
Go to contribution page -
Choose timezone
Your profile timezone: