Description
Conveners:
Maciej Bilicki (Center for Theoretical Physics, Warsaw)
Hyungjin Kim (DESY)
Fabrizio Rompineve (CERN)
Contact: eps23-conveners-t02 @desy.de
Monopoles are inevitable predictions of GUT theories. They are produced during phase transitions in the early universe, but also mechanisms like Schwinger effect in strong magnetic fields could give relevant contributions to the monopole number density. I will show that from the detection of intergalactic magnetic fields of primordial origin we can infer additional bounds on the magnetic...
We investigate the imprints of new long-range forces mediated by a new light scalar acting solely on dark matter. Dark fifth forces in general will modify the background evolution as well as the growth of density fluctuations. At the linear level, constraints are derived from CMB together with a full-shape analysis of the power spectrum as measured by BOSS. At the non-linear level, the...
Q-balls are non-topological solitons that coherently rotate in field space. We show that these coherent rotations can induce superradiance for scattering waves, thanks to the fact that the scattering involves two coupled modes. Despite the conservation of the particle number in the scattering, the mismatch between the frequencies of the two modes allows for the enhancement of the energy and...
The Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portal inflation (2hdSMASH) model consisting of Two Higgs doublets, a Standard Model (SM) singlet complex scalar and three SM singlet right-handed neutrinos can embed axion dark matter, neutrino masses and address inflation. We report on an investigation of the inflationary aspects of 2hdSMASH and its subsequent impact on low energy...
In several models of beyond Standard Model physics discrete symmetries play an important role. For instance, in order to avoid flavor changing neutral currents, a discrete Z2 symmetry is imposed on Two-Higgs-Doublet-Models (2HDM). This can lead to the formation of domain walls as the Z2 symmetry gets spontaneously broken during electroweak symmetry breaking in the early universe.
Due to...
Weak gravitational lensing - small distortions of photon paths due to the large-scale structure of the Universe - is an emerging cosmological probe, also known as "cosmic shear". I will present recent results of today's main cosmic shear surveys, with a focus on the Kilo-Degree Survey (KiDS) in which I take part. I will in particular discuss the current status of the so-called "$S_8$ tension"....
We revisit the framework of axion-like inflation, considering a warm inflation scenario in which the inflaton couples to the topological charge density of non-Abelian gauge bosons whose self-interactions result in a rapidly thermalizing heat bath. Including both dispersive (mass) and absorptive (friction) effects, we find that the system remains in a weak regime of warm inflation (thermal...
The idea of searching for gravitational waves using cavities in strong magnetic fields has recently received significant attention. In particular, cavities with rather small volumes that are currently used to search for axion-like particles are discussed in this context. We propose here a novel experimental scheme enabling the search for gravitational waves with MHz frequencies and above,...
As gravitational waves (GW) probe the strong field regime of gravity, they are an important tool for testing gravitational models. This requires an accurate description of the gravitational waveforms in modified gravity theories. In this work we focus on scalar Gauss Bonnet gravity (sGB), a promising extension of General Relativity (GR), to include finite size effects in the modelling of the...
Models of freeze-in Dark Matter (DM) have emerged as a compelling explanation for the absence of a signal in direct detection experiments. In these models, DM is generated through the decay of a feebly coupled parent particle. If the parent carries a gauged charge, it can be potentially detected in long-lived particle searches (LLPs). Moreover, in this framework, DM production predominantly...
The Ptolemy experiment aims at the detection of the cosmic neutrino background, which is produced approximately one second after the Big Bang, according to the Standard Cosmology. Due to the extremely low energy of these neutrinos, a reliable experimental detection can be achieved through neutrino captures on beta-unstable nuclides without the need for a specific energy threshold. Among the...
