In order to unravel the present situation of the PBH overproduction problem, our study
emphasizes the critical role played by the equation of state (EoS) parameter w within the …

A bstract We study finite temperature effects in string cosmology and their potential
gravitational wave signature. Expanding on our recent work [1], we consider a general …

In a recent paper (Phys. Rev. D 108 (2023) 095053), we have demonstrated that the 2023
PTA results, which hint at a stochastic gravitational wave (GW) background at nanohertz …

We study the possibility of testing a dark matter (DM) scenario embedded in a global lepton
number symmetry U (1) L via gravitational waves (GWs) and cosmic microwave background …

We study the possibility of generating dark matter (DM) purely from ultralight primordial black
hole (PBH) evaporation with the latter being produced from a first order phase transition …

The Bödeker-Moore thermal friction [1] is usually used to determine whether or not a bubble
wall can run away. However, the friction on the wall is not necessarily a monotonous …

We explore the phenomenological consequences of breaking discrete global symmetries in
quantum gravity (QG). We extend a previous scenario where discrete global symmetries are …

A bstract We study the formation of primordial black holes (PBHs) from density fluctuations
due to supercooled phase transitions (PTs) triggered in an axion-like particle (ALP) model …

Cosmic strings, theoretical one-dimensional topological defects from the early universe,
provide a valuable opportunity for exploring dark matter (DM) production and gravitational …

A bstract We study the phenomenology of a string bosenova explosion in vector
superradiance clouds around spinning black holes, focusing on the observable …