Publications (28)
Cosmological Correlators with Double Massive Exchanges: Bootstrap Equation and Phenomenology
Shuntaro Aoki, Lucas Pinol, Fumiya Sano +2
Using the recently developed cosmological bootstrap method, we compute the exact analytical solution for the seed integral appearing in cosmological correlators with double massive…
Cosmological Flow of Primordial Correlators
Denis Werth, Lucas Pinol, Sébastien Renaux-Petel
Correlation functions of primordial density fluctuations provide an exciting probe of the physics governing the earliest moments of our Universe. However, the standard approach to…
Inflationary stochastic anomalies
Lucas Pinol, Sébastien Renaux-Petel, Yuichiro Tada
The stochastic approach aims at describing the long-wavelength part of quantum fields during inflation by a classical stochastic theory. It is usually formulated in terms of Langev…
Primordial Stochastic Gravitational Wave Background Anisotropies: in-in Formalization and Applications
Ema Dimastrogiovanni, Matteo Fasiello, Lucas Pinol
Primordial non-Gaussianities of the scalar(tensor)-tensor-tensor type supporting a non-trivial squeezed component are known to induce anisotropies in the stochastic gravitational w…
Revisiting non-Gaussianity in multifield inflation with curved field space
Sebastian Garcia-Saenz, Lucas Pinol, Sébastien Renaux-Petel
Recent studies of inflation with multiple scalar fields have highlighted the importance of non-canonical kinetic terms in novel types of inflationary solutions. This motivates a th…
The Cosmological Flow: A Systematic Approach to Primordial Correlators
Lucas Pinol, Sébastien Renaux-Petel, Denis Werth
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 en…
Borel resummation of secular divergences in stochastic inflation
Masazumi Honda, Ryusuke Jinno, Lucas Pinol +1
We make use of Borel resummation to extract the exact time dependence from the divergent series found in the context of stochastic inflation. Correlation functions of self-interact…
No-go Theorem for Scalar-Trispectrum-Induced Gravitational Waves
Sebastian Garcia-Saenz, Lucas Pinol, Sébastien Renaux-Petel +1
We show that the contribution of the primordial trispectrum to the energy density of the scalar-induced stochastic gravitational wave background cannot exceed the one from the scal…
Multifield inflation beyond : non-Gaussianities and single-field effective theory
Lucas Pinol
In this article, we study in detail the linear dynamics and cubic interactions for any number of scalar fields during inflation, directly in terms of the observa…
Hyper non-Gaussianities in inflation with strongly non-geodesic motion
Jacopo Fumagalli, Sebastian Garcia-Saenz, Lucas Pinol +2
Several recent proposals to embed inflation into high-energy physics rely on inflationary dynamics characterized by a strongly non-geodesic motion in negatively curved field space.…
Freezing of the renormalized one-loop primordial scalar power spectrum
Matteo Braglia, Lucas Pinol
The predictive power of cosmic inflation hinges on the existence of a conserved quantity at very large scales, called the primordial curvature perturbation, which is therefore inse…
Searching for local features in primordial power spectrum using genetic algorithms
Kushal Lodha, Lucas Pinol, Savvas Nesseris +3
We present a novel methodology for exploring local features directly in the primordial power spectrum using a genetic algorithm (GA) pipeline coupled with a Boltzmann solver and Co…
Opening the reheating box in multifield inflation
Jerome Martin, Lucas Pinol
The robustness of multi-field inflation to the physics of reheating is investigated. In order to carry out this study, reheating is described in detail by means of a formalism whic…
Scale-Dependent Loop Corrections to the Inflationary Power Spectrum
Matteo Braglia, Sebastián Céspedes, Lucas Pinol
Loop corrections to primordial correlation functions are unavoidable due to the non-linear nature of gravity. Previous works have established a robust framework for computing the r…
The effective field theory of multi-field inflationary fluctuations
Lucas Pinol
We build an effective field theory of multi-field inflationary fluctuations based on the adiabatic perturbation and on any number of matter fluctuations in the non-adiabatic sector…
A manifestly covariant theory of multifield stochastic inflation in phase space: solving the discretisation ambiguity in stochastic inflation
Lucas Pinol, Sébastien Renaux-Petel, Yuichiro Tada
Stochastic inflation is an effective theory describing the super-Hubble, coarse-grained, scalar fields driving inflation, by a set of Langevin equations. We previously highlighted…
Imprint of DESI fiber assignment on the anisotropic power spectrum of emission line galaxies
Lucas Pinol, Robert N. Cahn, Nick Hand +2
The Dark Energy Spectroscopic Instrument (DESI), a multiplexed fiber-fed spectrograph, is a Stage-IV ground-based dark energy experiment aiming to measure redshifts for 29 million…
Machine learning cosmic inflation
Ahana Kamerkar, Savvas Nesseris, Lucas Pinol
We present a machine-learning approach, based on the genetic algorithms (GA), that can be used to reconstruct the inflationary potential directly from cosmological data. We create…
No time to derive: unraveling total time derivatives in in-in perturbation theory
Matteo Braglia, Lucas Pinol
The in-in formalism provides a way to systematically organize the calculation of primordial correlation functions. Although its theoretical foundations are now firmly settled, the…
New exact bispectrum shapes in multifield inflation
Lucas Pinol
The paper presents an analytical, non‑perturbative calculation of the primordial bispectrum in multifield inflation, deriving integral representations for mixed curvature‑isocurvat…
Cosmology with the Laser Interferometer Space Antenna
Pierre Auclair, David Bacon, Tessa Baker +177
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravita…
CosmoFlow: Python Package for Cosmological Correlators
Denis Werth, Lucas Pinol, Sébastien Renaux-Petel
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-l…
Back to the features: assessing the discriminating power of future CMB missions on inflationary models
Matteo Braglia, Xingang Chen, Dhiraj Kumar Hazra +1
Future Cosmic Microwave Background (CMB) experiments will deliver extremely accurate measurements of the E-modes pattern of the CMB polarization field. Given the sharpness of the E…
Searching for signatures of inflationary massive fields in DESI Imaging data and Stage-V galaxy surveys
Walter Riquelme, Santiago Avila, Lucas Pinol +2
The paper studies how massive fields present during inflation could leave detectable signatures in galaxy clustering, using DESI imaging data and forecasting the capability of futu…
One-loop renormalization of the effective field theory of inflationary fluctuations from gravitational interactions
Matteo Braglia, Lucas Pinol
We dig into the semi-classical description of gravity by studying one-loop corrections to primordial power spectra generated during cosmic inflation from gravitational nonlinear in…
Metric preheating and radiative decay in single-field inflation
Jérôme Martin, Theodoros Papanikolaou, Lucas Pinol +1
At the end of inflation, the inflaton oscillates at the bottom of its potential and these oscillations trigger a parametric instability for scalar fluctuations with wavelength …
Primordial Gravitational Waves in non-Minimally Coupled Chromo-Natural Inflation
Ema Dimastrogiovanni, Matteo Fasiello, Martino Michelotti +1
We consider inflation driven by an axion-like particle coupled to an SU(2) gauge sector via a Chern-Simons term. Known as chromo-natural inflation, this scenario is in tension with…
Inflationary flavor oscillations and the cosmic spectroscopy
Lucas Pinol, Shuntaro Aoki, Sébastien Renaux-Petel +1
Inflationary scenarios motivated by high-energy physics generically contain a plethora of degrees of freedom beyond the primordial curvature perturbation. The latter interacts in a…