What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?

Abstract

Inflation generates gravitational waves, which may be observable in the low multipoles of the cosmic microwave background (cmb) anisotropy but only if the inflaton field variation is at least of order the Planck scale. Such a large variation would imply that the model of inflation cannot be part of an ordinary extension of the standard model, and combined with the detection of the waves it would also suggest that the inflaton field cannot be one of the superstring moduli. Another implication of observable gravitational waves would be a potential $V^{1/4}=2$ to $4\times 10^{16}\GeV$, which is orders of magnitude bigger than is expected on the basis of particle theory. It might emerge in a hybrid inflation model where most of the energy density comes from the Higgs sector of a GUT, but only if both the vacuum expectation values {\em and the masses } of the Higgs fields are of this order.

3 pages

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• Inflation and long-range force from clockwork $D$-term
• Perspective on completing natural inflation
• Towards an Observational Appraisal of String Cosmology
• Observable Signatures of a Classical Transition
• Limits on the gravity wave contribution to microwave anisotropies
• Inflation after WMAP3
• Understanding selection effects in observed samples of cataclysmic variables
• Bounds on Tensor wave and Twisted Inflation
• Detecting the tensor-to-scalar ratio with the pure pseudospectrum reconstruction of $B$-mode
• Saddle point inflation from $f(R)$ theory
• Modified natural inflation: A small single field model with a large tensor to scalar ratio
• Warped Radion Inflation
• Large Field Inflation Models from Higher-Dimensional Gauge Theories
• Canonical single field slow-roll inflation with a non-monotonic tensor-to-scalar ratio
• Inflation with a class of concave inflaton potentials in Randall-Sundrum model
• What We Can Learn from the Running of the Spectral Index if no Tensors are Detected in the Cosmic Microwave Background Anisotropy
• Quantum Smearing in Hybrid Inflation with Chaotic Potentials
• Relic Cosmological Vector Fields and Inflationary Gravitational Waves
• Inflation in Supergravity with a Single Superfield
• Observable Quantum Loop Effects in the Sky
• D-Flation
• Power spectrum oscillations from Planck-suppressed operators in effective field theory motivated monodromy inflation
• B-modes and the sound speed of primordial fluctuations
• Prospects for Primordial Gravitational Waves in String Inflation
• The Tensor Desert
• On the strong coupling scale in Higgs G-inflation
• Preheating with higher dimensional interaction
• Small field models of inflation that predict a tensor-to-scalar ratio $r=0.03$
• Refined Swampland conjecture in deformed Starobinsky gravity
• N-flation in Supergravity
• Cosmic perturbations, baryon asymmetry and dark matter from the minimal supersymmetric standard model
• Signatures of Planck Corrections in a Spiralling Axion Inflation Model
• Baryogenesis from the amplification of vacuum fluctuations during inflation
• Non-Minimal M-flation
• Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
• Constraining Modified Gravity with Large non-Gaussianities
• Scale invariance of the primordial tensor power spectrum
• Heavy Gravitino and Split SUSY in the Light of BICEP2
• Inflationary field excursion in broad classes of scalar field models
• Studying G-axion Inflation model in light of PLANCK
• The cosmological singularity problem
• Beginning of Universe through large field hybrid inflation
• Impact of trans-Planckian quantum noise on the Primordial Gravitational Wave spectrum
• TwInflation
• Kinetic Term Anarchy for Polynomial Chaotic Inflation
• BICEP2 and the Central Charge of Holographic Inflation
• Confronting the Potential-driven DBI-inspired nonminimal kinetic coupling (Dinkic) inflation to the observational data
• Inflation in string theory confronts data/Les modèles d'inflation en théorie des cordes face aux observations
• A possible solution to the Hubble tension from quantum gravity
• Constraints on small-field axion inflation
• Generalizing the Swampland: Embedding $P(X,\phi )$ Inflationary Theories in a Curved Multi-field Space
• Possibly Large Corrections to the Inflationary Observables
• Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• SuperCool Inflation: A Graceful Exit from Eternal Inflation at LHC Scales and Below
• Curvaton mechanism after multi-field inflation
• GUT-scale inflation with sizeable tensor modes
• Multi-field inflation and the field-space metric
• Extra-Natural Inflation (De)constructed
• Natural inflation and moduli stabilization in heterotic orbifolds
• A narrow-band parameterization for the stochastic gravitational wave background
• Initial conditions for small-field inflation
• Analytic results in aligned axion inflation
• Ultraviolet Sensitivity of Peccei-Quinn Inflation
• Testing hilltop supernatural inflation with gravitational waves
• Cosmological implications of neutrinos
• An Inflationary Equation of State
• Observable predictions of generalised inflationary scenarios
• Observable Gravitational Waves and Spectral Index Running in Small Single Field Inflationary Models
• Pre-heating in the framework of massive gravity
• A Match Made in Heaven: Linking Observables in Inflationary Cosmology
• Kinetically Modified Non-Minimal Inflation With Exponential Frame Function
• M-flation and its spectators
• Numerical Analysis of the Primordial Power Spectrum for (Small Field) Inflationary Potentials
• The Upper Bound on the Tensor-to-Scalar Ratio Consistent with Quantum Gravity
• The fate of Quasi-Exponential inflation in the light of ACT-DR6
• The Early Universe with High-Scale Supersymmetry
• Spinodal Backreaction During Inflation and Initial Conditions
• Analytic Correlation of Inflationary Potential to Power Spectrum Shape: Limits of Validity, and `No-Go' for Small Field Model Analytics
• Supersymmetric Inflation from the Fifth Dimension
• Spectator fields and their imprints on the Cosmic Microwave Background
• Correlating Visual Characteristics and Cryogenic Performance of Superconducting Detectors
• Modified hybrid inflation in no-scale SUGRA with suppressed $R$-symmetry breaking
• Constraints on the generalized natural inflation after Planck 2018
• Moduli Dynamics in Effective Nested Warped Geometry in Four Dimensions and Some Cosmological Implications
• Inflation with vector fields revisited: heavy entropy perturbations and primordial black holes
• Dark Energy and CMB
• A note on supergravity inflation in braneworld
• A Foreground Model Independent Bayesian CMB Temperature and Polarization Signal Reconstruction and Cosmological Parameter Estimation over Large Angular Scales
• Pure Natural Quintessential Inflation and Dark Energy
• Scaling behavior of observables as a model characteristic in multifield inflation
• Gravitino condensation, supersymmetry breaking and inflation
• Large Field Inflation in Supergravity
• Model Building with Non-Compact Cosets
• Model-independent constraints on inflation and reheating
• Axions, strong and weak CP, and KNP inflation
• Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite
• Inflationary $\alpha$-Attractor From Type IIB/F Theory
• Dynamics of potential-free warm $\mathbf{k}$-inflation with nonminimal derivative coupling
• Weakly Broken Galileon Symmetry in Cosmology
• Confronting the magnetically-induced holographic composite inflation with observation
• Finite inflation in curved space
• Numerical calcultaion of e-fold number from hilltop with two inflatons
• Gravitational Waves from Gauge Quanta Produced during Inflation
• Aspects of inflation and the very early universe
• Non-Gaussianity from explicit $U(1)$-breaking interactions
• Very-High-Frequency Gravitational Waves from Multi-Monodromy Inflation
• Primordial black holes with anisotropic hair
• Conformal General Relativity -- Unified Theory of the Standard Models of Elementary Particles and Modern Cosmology