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The discovery of the Higgs boson, ten years ago, was a milestone that opened the door to
the study of a new sector of fundamental physical interactions. We review the role of the …

We present a model-independent search for a gravitational wave background from cosmic
domain walls (DWs) in the NANOGrav 12.5 years dataset and International PTA Data …

A bstract We describe a new phenomenon in quantum cosmology: self-organised
localisation. When the fundamental parameters of a theory are functions of a scalar field …

Ultralight dark matter exhibits an order-one density fluctuation over the spatial scale of its
wavelength. These fluctuations gravitationally interact with gravitational wave …

The adiabatic growth of a central massive black hole could compress the surrounding dark
matter halo, leading to a steeper profile of the dark matter halo. This phenomenon is called …

The axion-gluon coupling is the defining feature of the QCD axion. This feature induces
additional and qualitatively different interactions of the axion with standard model particles …

A massive astrophysical object deforms the local distribution of dark matter, resulting in a
local overdensity of dark matter. This phenomenon is often referred to as gravitational …

Both parameters in the Higgs field's potential, its mass and quartic coupling, appear fine-
tuned to near-critical values, which gives rise to the hierarchy problem and the metastability …

A bstract We present a cosmological solution to the electroweak hierarchy problem. After
discussing general features of cosmological approaches to naturalness, we extend the …