Raphael Flauger
A5036225835- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Superconducting and THz Device Technology
- Astronomy and Astrophysical Research
- Topic Modeling
- Natural Language Processing Techniques
- Particle physics theoretical and experimental studies
- Spacecraft and Cryogenic Technologies
- Stochastic processes and financial applications
- Spacecraft Design and Technology
- Quantum Chromodynamics and Particle Interactions
- Speech Recognition and Synthesis
- Astrophysics and Star Formation Studies
- Quantum Mechanics and Non-Hermitian Physics
- Astro and Planetary Science
- Earth Systems and Cosmic Evolution
- Physics of Superconductivity and Magnetism
University of California, San Diego
2017-2024
Centre National de la Recherche Scientifique
2018-2020
UC San Diego Health System
2020
Centre National d'Études Spatiales
2020
Institut Nanosciences et Cryogénie
2018
Flatiron Health (United States)
2018
Flatiron Institute
2018
Jet Propulsion Laboratory
2018
California Institute of Technology
2018
High Energy Accelerator Research Organization
2018
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
This book lays out the scientific goals to be addressed by next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned consist of dedicated telescopes at South Pole, high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies crossing critical thresholds in search for B-mode polarization signature primordial gravitational waves, determination number...
We study the CMB observables in axion monodromy inflation. These well-motivated scenarios for inflation string theory have monomial potentials over super-Planckian field ranges, with superimposed sinusoidal modulations from instanton effects. Such periodic of potential can drive resonant enhancements correlation functions cosmological perturbations, characteristic amplitude as a function wavenumber. give an analytical result scalar power spectrum this class models, and we determine limits...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes physics inflation. focus on prospects for using CMB to differentiate various inflationary mechanisms. In particular, a detection primordial B‐mode would demonstrate that inflation occurred at very high energy scale, and inflaton traversed super‐Planckian distance in field space. explain how such or constraint illuminate aspects Planck scale. Moreover, can constrain scale‐dependence...
Oscillons are massive, long-lived, localized excitations of a scalar field. We show that in large class well-motivated single-field models, inflation is followed by self-resonance, leading to copious oscillon generation and lengthy period domination. These models characterized an inflaton potential which has quadratic minimum shallower than away from the minimum. This set includes both string monodromy supergravity inspired scenarios, good agreement with current central values concordance...
BICEP2 has reported the detection of a degree-scale B-mode polarization pattern in Cosmic Microwave Background (CMB) and interpreted measurement as evidence for primordial gravitational waves. Motivated by profound importance discovery waves from early Universe, we examine to what extent combination Galactic foregrounds lensed E-modes could be responsible signal. We reanalyze results show that 100 ×150 GHz 150 data are consistent with cosmology r=0.2 negligible foregrounds, but also r=0...
We present a set of tools to assess the capabilities LISA detect and reconstruct spectral shape amplitude stochastic gravitational wave background (SGWB) . first provide power-law sensitivity curve binned curves, based on latest updates design. These curves are useful make qualitative assessment detection reconstruction prospects SGWB For quantitative with arbitrary power spectrum shape, we propose novel data analysis technique: by means an automatized adaptive procedure, conveniently split...
Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding origin evolution universe. Among science cases pursued with CMB-S4, quest for detecting primordial gravitational waves is a central driver experimental design. This work details development forecasting framework that includes power-spectrum-based semianalytic projection tool, targeted explicitly toward...
Abstract LiteBIRD, the Lite (Light) satellite for study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission primordial cosmology fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as strategic large-class (L-class) mission, with an expected launch late 2020s using JAXA’s H3 rocket. planned to orbit Sun–Earth Lagrangian point L2, where it will map microwave over entire sky three years, telescopes 15...
The authors perform an independent analysis of the Planck data and discuss tension between parameters (Hubble constant etc.) derived by team those obtained from a number other astronomical measurements. They find that particular set (217 GHz maps) drives this tension, which they are able to decrease, confirming standard six parameter $\mathrm{\ensuremath{\Lambda}}\phantom{\rule{0}{0ex}}C\phantom{\rule{0}{0ex}}D\phantom{\rule{0}{0ex}}M$ model.
We provide a derivation from first principles of the primordial bispectrum scalar perturbations produced during inflation driven by canonically normalized field whose potential exhibits small sinusoidal modulations. A this type has been derived in class string theory models based on axion monodromy. use model as concrete example, but we present our derivations and results for general slow-roll with superimposed show analytically that resonance between oscillations background fluctuations is...
The Probe of Inflation and Cosmic Origins (PICO) is a proposed probe-scale space mission consisting an imaging polarimeter operating in frequency bands between 20 800 GHz. We describe the science achievable by PICO, which has sensitivity equivalent to more than 3300 Planck missions, technical implementation, schedule cost.
Cosmic inflation provides a window to the highest energy densities accessible in nature, far beyond those achievable any realistic terrestrial experiment. Theoretical insights into inflationary era and its observational probes may therefore shed unique light on physical laws underlying our universe. This white paper describes current theoretical understanding of era, with focus statistical properties primordial fluctuations. In particular, we survey targets for three important signatures...
Abstract PICO is a concept for NASA probe-scale mission aiming to detect or constrain the tensor scalar ratio r , parameter that quantifies amplitude of inflationary gravity waves. We carry out map-based component separation on simulations with five foreground models and input values in = 0 0.003. forecast determinations using Gaussian likelihood assuming either no delensing residual lensing factor A lens 27%. By implementing first full-sky, post component-separation, map-domain delensing,...
Abstract We study the possibility of using LiteBIRD satellite B -mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar “axionlike” field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order...
We derive several no-go theorems in the context of massive type IIA string theory compactified to four dimensions a way that, absence fluxes, preserves $\mathcal{N}=1$ supersymmetry. Our derivation is based on dilaton, K\"ahler and complex structure moduli dependence potential four-dimensional effective field theory, that generated by presence $D6$-branes, $O6$-planes, RR NSNS 3-form flux, geometric fluxes. To demonstrate usefulness our theorems, we apply them most commonly studied class...
The n-point correlation functions in single-field inflation obey a set of consistency conditions the exact squeezed limit which are not present multi-field models, and thus powerful tools to distinguish between two. However, these may be violated for finite range scales example by departures from Bunch-Davies state. These excited states consequence interactions during inflation, or remnant era that preceded inflation. In this paper we analyze bispectrum, show regime theoretical control...
We analyze the evolution of perturbations in inflaton field and metric following end inflation. present accurate analytic approximations for perturbations, showing that coherent oscillations post-inflationary condensate necessarily break down long before any current phenomenological constraints require universe to become radiation dominated. Further, breakdown occurs on length-scales equivalent comoving horizon size. This work has implications both inflationary "matching" problem, possible...
We propose a new approach for the calculation of spectrum excitations QCD flux tubes. It relies on fact that worldsheet theory is integrable at low energies. With this approach, energy levels can be calculated much shorter tubes than was previously possible, allowing quantitative comparison with existing lattice data. The improved theoretical control makes it manifest data provides strong evidence pseudoscalar particle localized tube---the axion.