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Imprints of Spinning Particles on Primordial Cosmological Perturbations
Gabriele Franciolini, Alex Kehagias, Antonio Riotto
If there exist higher-spin particles during inflation which are light compared to the Hubble rate, they may leave distinct statistical anisotropic imprints on the correlators invol…
The Clockwork Supergravity
Alex Kehagias, Antonio Riotto
We show that the minimal D = 5, N = 2 gauged supergravity set-up may encode naturally the recently proposed clockwork mechanism. The minimal embedding requires one vector multiplet…
A Cosmological Signature of the Standard Model Higgs Vacuum Instability: Primordial Black Holes as Dark Matter
J. R. Espinosa, D. Racco, A. Riotto
For the current central values of the Higgs and top masses, the Standard Model Higgs potential develops an instability at a scale of the order of GeV. We show that a cosm…
The impact of ultra-light axion self-interactions on the large scale structure of the Universe
Vincent Desjacques, Alex Kehagias, Antonio Riotto
Ultra-light axions have sparked attention because their tiny mass eV, which leads to a Kiloparsec-scale de Broglie wavelength comparable to the size of dwarf galax…
Detecting higher spin fields through statistical anisotropy in the CMB and galaxy power spectra
Nicola Bartolo, Alex Kehagias, Michele Liguori +3
Primordial inflation may represent the most powerful collider to test high-energy physics models. In this paper we study the impact on the inflationary power spectrum of the comovi…
On the Catalysis of the Electroweak Vacuum Decay by Black Holes at High Temperature
D. Canko, I. Gialamas, G. Jelic-Cizmek +2
We study the effect of primordial black holes on the classical rate of nucleation of AdS regions within the standard electroweak vacuum at high temperature. We find that the energy…