Astrophysical properties of 15062 <i>Gaia</i> DR3 gravity-mode pulsators

Driving and damping mechanisms in hybrid pressure-gravity modes pulsators

Abstract. We study the energetic aspects of hybrid pressure-gravity modes pulsations. The case of hybrid β Cephei-SPB pulsators is considered with special attention. In addition to the already known sensitivity of the driving mechanism to the heavy elements mixture (mainly the iron abundance), we show that the characteristics of the propagation and evanescent regions play also a major role, det...

Quantum Gravity at Astrophysical Distances?

Assuming that Quantum Einstein Gravity (QEG) is the correct theory of gravity on all length scales we use analytical results from nonperturbative renormalization group (RG) equations as well as experimental input in order to characterize the special RG trajectory of QEG which is realized in Nature and to determine its parameters. On this trajectory, we identify a regime of scales where gravitat...

Possible Astrophysical Probes of Quantum Gravity

A satisfactory theory of quantum gravity will very likely require modification of our classical perception of space-time, perhaps by giving it a ‘foamy’ structure at scales of order the Planck length. This is expected to modify the propagation of photons and other relativistic particles such as neutrinos, such that they will experience a non-trivial refractive index even in vacuo. The implied s...

Cosmological and astrophysical tests of quantum gravity

Physics in the vicinity of an ultraviolet stable fixed point of a quantum field theory is parametrized by a renormalization group invariant macroscopic length scale, the correlation length ξ, with the quantum effective action a function of this length scale. Numerical simulations of quantum gravity suggest the existence of just such a fixed point. Since the quantum effective action is a functio...

Investigating High Field Gravity Using Astrophysical Techniques