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pro vyhledávání: '"Pétel A"'
Violating the slow-roll regime during the final stages of inflation can significantly enhance curvature perturbations, a scenario often invoked in models producing primordial black holes and small-scale scalar induced gravitational waves. When pertur
Externí odkaz:
http://arxiv.org/abs/2410.23942
Autor:
Braglia, Matteo, Calcagni, Gianluca, Franciolini, Gabriele, Fumagalli, Jacopo, Nardini, Germano, Peloso, Marco, Pieroni, Mauro, Renaux-Petel, Sébastien, Ricciardone, Angelo, Tasinato, Gianmassimo, Vaskonen, Ville
Various scenarios of cosmic inflation enhance the amplitude of the stochastic gravitational wave background (SGWB) at frequencies detectable by the LISA detector. We develop tools for a template-based analysis of the SGWB and introduce a template dat
Externí odkaz:
http://arxiv.org/abs/2407.04356
Publikováno v:
Phys.Rev.Lett. 133 (2024) 15, 151001
For the first time, we investigate the non-perturbative dynamics of single field inflation with a departure from slow-roll. Using simulations, we find that oscillatory features in the potential can drastically alter the course of inflation, with majo
Externí odkaz:
http://arxiv.org/abs/2403.12811
Publikováno v:
Class. Quantum Grav. 41 175015 (2024)
Cosmological correlators hold the key to high-energy physics as they probe the earliest moments of our Universe, and conceal hidden mathematical structures. However, even at tree-level, perturbative calculations are limited by technical difficulties
Externí odkaz:
http://arxiv.org/abs/2402.03693
We study the statistics of scalar perturbations in models of inflation with small and rapid oscillations in the inflaton potential (resonant non-Gaussianity). We do so by deriving the wavefunction $\Psi[\zeta(\boldsymbol{x})]$ non-perturbatively in $
Externí odkaz:
http://arxiv.org/abs/2401.10212
The time evolution of primordial fluctuations conceals a wealth of insights into the high-energy physics at play during the earliest moments of our Universe, which is ultimately encoded in late-time spatial correlation functions. However, the convent
Externí odkaz:
http://arxiv.org/abs/2312.06559
Autor:
Bagui, Eleni, Clesse, Sebastien, De Luca, Valerio, Ezquiaga, Jose María, Franciolini, Gabriele, García-Bellido, Juan, Joana, Cristian, Jain, Rajeev Kumar, Kuroyanagi, Sachiko, Musco, Ilia, Papanikolaou, Theodoros, Raccanelli, Alvise, Renaux-Petel, Sébastien, Riotto, Antonio, Morales, Ester Ruiz, Scalisi, Marco, Sergijenko, Olga, Unal, Caner, Vennin, Vincent, Wands, David
In the recent years, primordial black holes (PBHs) have emerged as one of the most interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could explain both some of the signals from binary black hole mergers observed in gr
Externí odkaz:
http://arxiv.org/abs/2310.19857
Parity violation in the early universe holds great promise for uncovering new physics. In particular, the primordial scalar four-point correlation function is allowed to develop a parity-violating component when massive spinning particles coupled to
Externí odkaz:
http://arxiv.org/abs/2308.11315
Autor:
Fumagalli, Jacopo, Bhattacharya, Sukannya, Peloso, Marco, Renaux-Petel, Sébastien, Witkowski, Lukas T.
We show that, whenever the perturbations of some field are excited during inflation by a physical process on sub-horizon scales, they unavoidably generate, even through gravitational interactions alone, a significant resonant IR cascade of power down
Externí odkaz:
http://arxiv.org/abs/2307.08358
Massive particles produced during inflation leave specific signatures in soft limits of correlation functions of primordial fluctuations. When the Goldstone boson of broken time translations acquires a reduced speed of sound, implying that de Sitter
Externí odkaz:
http://arxiv.org/abs/2307.01751