6 papers
ACT stands for Awkward Cosmology Theories
Loris Del Grosso, Alfredo Urbano, Marcello Ziccolella
Recent observations from the Atacama Cosmology Telescope (ACT) point to a scalar spectral index in tension with the predictions of Starobinsky inflation. Two main strategies have b…
Off-Equatorial Orbits around Magnetically Charged Black Holes
Xilai Li, Loris Del Grosso, David E. Kaplan
We present a complete characterization of stable, off-equatorial circular orbits around magnetically charged black holes (MBHs). For a static, spherically symmetric MBH, we derive…
Insights into the highest natural scale: Finite naturalness challenges inflationary dynamics
Pier Giuseppe Catinari, Loris Del Grosso, Luca Di Giovanni +1
We apply the criterion of finite naturalness to the limiting case of a generic heavy sector decoupled from the Standard Model. The sole and unavoidable exception to this decoupling…
Is the formation of primordial black holes from single-field inflation compatible with standard cosmology?
Sasha Allegrini, Loris Del Grosso, Antonio J. Iovino +1
In this work, we investigate the generation of primordial black holes (PBHs) within the framework of single-field inflationary models and their compatibility with the cosmological…
Systematic biases from ignoring environmental tidal effects in gravitational wave observations
Valerio De Luca, Loris Del Grosso, Francesco Iacovelli +2
Binary black hole systems are typically assumed to evolve in vacuum. However, the environment surrounding the binary components can influence their properties, such as their tidal…
Cosmological Consequences of Unconstrained Gravity and Electromagnetism
Loris Del Grosso, David E Kaplan, Tom Melia +3
Motivated by the quantum description of gauge theories, we study the cosmological effects of relaxing the Hamiltonian and momentum constraints in general relativity and Gauss' law…