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Daniele Montanino (Istituto Nazionale di Fisica Nucleare), Martina Gerbino (Istituto Nazionale di Fisica Nucleare)29/01/2026, 14:15
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Edoardo Vitagliano (Istituto Nazionale di Fisica Nucleare)29/01/2026, 14:30
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Nicklas Ramberg (Istituto Nazionale di Fisica Nucleare)29/01/2026, 15:00
In this talk we will discuss a new classical mechanism for bubble nucleation which relies on collapsing boson stars with attractive self-interactions. The phenomena can occur provided dense boson stars are formed in the false vacuum. As the boson star collapse the field value inside the stars core gets significantly enhanced and can classically roll over the potential barrier. Hence the star...
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Ángel Gil Muyor (Università degli studi di Padova)29/01/2026, 15:12
The axion is one of the best-motivated candidates for new physics, as it could solve current puzzles such as the Strong CP Problem or the nature of Dark Matter. An especially appealing possibility for its detection comes from astrophysical sources; hot and dense environments, such as Supernovae or Neutron Star mergers, are efficient factories of axions, which can then be converted into photons...
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Francesca Lecce (Istituto Nazionale di Fisica Nucleare)29/01/2026, 15:24
Axion-like particles (ALPs) coupled to nucleons can be efficiently produced in core-collapse supernovae (SNe) and then, if they couple to photons, convert into gamma rays in cosmic magnetic fields, generating short gamma-ray bursts. Though ALPs from a Galactic SN would induce an intense and easily detectable gamma-ray signal, such events are exceedingly rare. In contrast, a few SNe per year...
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Alessandro Lella (Istituto Nazionale di Fisica Nucleare)29/01/2026, 16:06
Scalars sporting a coupling to nucleons with masses $m_\phi$<1 MeV might be copiously produced in cold isolated neutron stars (NSs). Despite NSs can be only used as probes complementary to the classic supernova (SN) 1987A cooling bound in the case of axions, I will discuss how the shallow temperature dependence of the scalar emissivity leads to a huge enhancement in the effect of scalars on...
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Francescopaolo Lopez (SISSA, Istituto Nazionale di Fisica Nucleare)29/01/2026, 16:18
Very little is known about the reheating phase after inflation, which is only constrained to finish before BBN, at a temperature higher than O(1) MeV. We show that this effective matter domination can be long enough that structures can form, inflaton star can condense inside the halos and eventually grow to collapse into PBH. By employing PBH constraints we are able to improve constraints on...
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Federico Mescia (Istituto Nazionale di Fisica Nucleare)29/01/2026, 16:30
In this talk I begin by introducing the axion solution to the strong CP problem and the associated axion‑quality puzzle, namely the challenge of protecting the Peccei–Quinn (PQ) symmetry from dangerous explicit breaking. I then present a Pati–Salam–based model where an accidental high‑quality PQ symmetry emerges from the interplay of vertical and horizontal gauge symmetries. The setup predicts...
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Isabella Masina (Istituto Nazionale di Fisica Nucleare)29/01/2026, 16:42
In the Standard Model, partial unification of the non-Abelian running gauge couplings is achieved at the scale μ_32^SM≈2.8×10^16 GeV. Elaborating on this fact, we discuss a simple general parametrization for the new physics corrections leading to full unification at some scale M_X. We show that for any new physics model such that the corrections to the non-Abelian couplings are equal (or...
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29/01/2026, 16:54
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