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16/09/2025 16:30
The QCD sum rules technique is a very useful tool in order to analytically calculate a series of hadronic parameters. I will explain the concept, basis and development of the method, illustrating a practical example meanwhile and one of its many applications.
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16/09/2025 16:35
Radio-loud strong gravitational lensed quasars are a robust probe of axion-like particles (ALPs), one of the most promising dark matter candidates. The coupling of a pseudoscalar field (the ALP) with the electromagnetic field (EM), via a Chern-Simons type term, produces achromatic birefringence, i.e., a rotation of the polarisation angle independent of frequency. In the geometric optics...
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16/09/2025 16:40
In this talk I will present the Neutrino Global Fit, obtained from results of different neutrino oscillations experiments, and the possibility in the future to use its methodology to gain information about ultra light Dark Matter.
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16/09/2025 16:45
This study presents a search for Dark Photon signals at the Short-Baseline Near Detector (SBND), recently commissioned at Fermilab. Dark Photons, predicted in minimal extensions of the Standard Model with an extra U(1) gauge symmetry, can be a source of electron positron pairs, producing broader and more energetic shower topologies than neutrino-induced backgrounds. Exploiting SBND’s excellent...
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16/09/2025 16:50
We present an optomechanical approach to particle detection using a modified Michelson interferometer, where one mirror is replaced by a thin silicon nitride membrane. The membrane’s mechanical motion, induced by particle interactions, is read out via homodyne detection of the optical signal. This setup provides high sensitivity and paves the way for a scalable network of mechanical particle...
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16/09/2025 16:55
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16/09/2025 17:05
Providing an elegant solution to the strong CP problem, and representing a promising candidate for cold dark matter, the QCD axion is one of the best motivated light BSM particles. For this reason, the experimental effort in the search for the axion has increased drastically in recent times, with new experimental proposals like IAXO at DESY, and FLASH at the INFN. This makes it necessary to...
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16/09/2025 17:15
Cosmological models with QCD axions and/or ALPs can be affected by a domain wall (DW) problem. We review and propose solutions, beyond proposing a biased axion potential, taking into account thermal plasma friction: we evaluate the plasma pressure acting on a DW with velocity v taking into account the relevant particle processes, deriving and studying the relative VOS model and obtaining...
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16/09/2025 17:25
We present the inverse bremsstrahlung (IB) absorption of GWs as a novel approach to GWs physics that can help set constraints on different physical models. The observation of GWs of a given frequency sets constraints on its absorption efficiency, which depends on the characteristics of the medium of propagation. In the case of interacting dark matter, this can translate to constraints on its...
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16/09/2025 17:35
Part of the community has intensively searched for ALP signals, as well as conducted dedicated data analyses to identify potential evidence of New Physics compatible with an ALP, resulting in constraints on the ALP parameter space. Therefore, it is now the time to present a tool, ALPaca, that facilitates the combination among the different information on ALP physics. The focus of this talk...
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16/09/2025 17:45
Axions and Axion-Like-Particles (ALPs) are theoretically well-motivated candidates for dark matter that, due to their large occupation number, can be described as oscillating classical fields. These particles may feature a quadratic interaction with ordinary matter which can modify the field's dynamics in the vicinity of such objects, inducing a very interesting phenomenology. In this talk, I...
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16/09/2025 17:55
The Sine-Gordon and Christ-Lee potentials; Abstract: Domain walls are the simplest type of topological defects formed at cosmological phase transitions, and one of the most constrained. Their studies 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...
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16/09/2025 18:05
The evidence for the existence of dark matter from astrophysical observations is strong. However, there has not been a conclusive direct detection of dark matter that does not rely on gravitational interaction with visible matter. One experiment, DAMA, claims to have observed an annual modulation signal in a sodium-iodide-based detector consistent with that expected from dark matter....
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16/09/2025 18:15
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16/09/2025 18:25
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16/09/2025 18:35
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16/09/2025 18:45
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18/09/2025 16:30
Gravitational microlensing upon passage of compact objects in front of background stars brightens them and provides a way to investigate the lensing bodies. Nonetheless, photometric light curves by themselves are not sufficient to uniquely constrain important parameters such as mass, distance, and velocity because of the degeneracies. Typical second-order effects like parallax and...
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18/09/2025 16:40
Vacuum magnetic birefringence (VMB) is a currently undetected con- sequence of quantum electrodynamics (QED) which results from the pre- diction of virtual electron-positron pairs allowing for the polarization of vacuum under the influence of a strong magnetic field. The ALPSII string consists of a 212m, 5.3T magnet string with modulation capabilities cur- rently in the mHz regime, which can...
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18/09/2025 16:50
Axion-like particles (ALPs) can be copiously produced in binary neutron star (BNS) mergers through nucleon-nucleon bremsstrahlung if the ALP-nucleon couplings are sizable. Furthermore, the ALP-photon coupling may trigger conversions of ultralight ALPs into photons in the magnetic fields of the merger remnant and of the Milky Way. This effect would lead to a potentially observable short...
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18/09/2025 17:00
The PADME experiment, designed to investigate potential signatures of physics beyond the Standard Model, has conducted a resonant search for a hypothetical X17 particle, potentially linked to the anomaly observed at ATOMKI. During Run III, PADME employed a positron beam impinging on a fixed diamond target to explore resonant electron-positron annihilation processes near 17 MeV, where the new...
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18/09/2025 17:10
A generic aspect of effective field theories coming from string compactifications is the appearance of moduli fields. Among these moduli, the axion and dilaton are present at low energies as (pseudo-)Goldstone bosons from the spontaneous breaking of an exact (or approximate) global symmetry. These moduli have a different microscopic coupling to matter but appear kinetically coupled in such a...
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18/09/2025 17:20
In this talk, I will present the string theory dynamics of the volume scalar rolling down an exponential potential in a background of cosmic superstring loops. In the context of the LVS potential, we demonstrate the existence of a novel string loop attractor tracker solution, in which 75% of the energy density of the universe is in the form of a gas of fundamental cosmic superstring loops...
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18/09/2025 17:30
A pulsar, i.e., a spinning neutron star, with a deformation could emit gravitational waves continuously. Such continuous waves, which have not been detected yet, will be very useful to study gravitational physics and to probe the extreme physics of neutron stars. While typically such waves from a pulsar are estimated considering an overall stellar ellipticity, there can be multiple...
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