The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a newly formed, global
collaboration dedicated to observing and studying cosmic rays (CR) and cosmic-ray …

Benefitting from the unequaled precision of the pulsar timing technique, binary pulsars are
important testbeds of gravity theories, providing some of the tightest bounds on alternative …

The existence of quark matter inside the heaviest neutron stars has been the topic of
numerous recent studies, many of them suggesting that a phase transition to strongly …

We investigate the possibility that GW170817 was not the merger of two conventional
neutron stars (NS), but involved at least one if not two hybrid stars with a quark matter core …

We explore the connection between the stiffness of a hadronic equation of state (EoS) with a
sharp phase transition to quark matter to its tidal deformability. For this we employ a …

We demonstrate that future radius measurements of the NICER mission have the potential to
reveal the existence of a strong phase transition in dense neutron star matter by confirming …

The observations of PSR J0952-0607 (M= 2. 35− 0.17+ 0.17 M⊙) and the second object in
the GW190814 event (M= 2. 59− 0.09+ 0.08 M⊙) indicate the possible existence of …

The tidal deformability and the radius of neutron stars are observables, which have been
used to constrain the neutron star equation of state and explore the composition in neutron …

It was recently discovered that scalarized neutron stars in scalar-tensor theories can
undergo a gravitational phase transition to a nonscalarized (GR) state. Surprisingly, even …

We examine which first order phase transitions are consistent with today's astrophysical
constraints. In particular, we explore how a well-constrained mass-radius data point would …