False Vacuum Inflation with Einstein Gravity

Abstract

We investigate chaotic inflation models with two scalar fields, such that one field (the inflaton) rolls while the other is trapped in a false vacuum state. The false vacuum becomes unstable when the inflaton field falls below some critical value, and a first or second order transition to the true vacuum ensues. Particular attention is paid to Linde's second-order `Hybrid Inflation'; with the false vacuum dominating, inflation differs from the usual true vacuum case both in its cosmology and in its relation to particle physics. The spectral index of the adiabatic density perturbation can be very close to 1, or it can be around ten percent higher. The energy scale at the end of inflation can be anywhere between $10^{16}$\,GeV and $10^{11}$\,GeV, though reheating is prompt so the reheat temperature can't be far below $10^{11}$GeV. Topological defects are almost inevitably produced at the end of inflation, and if the inflationary energy scale is near its upper limit they can have significant effects. Because false vacuum inflation occurs with the inflaton field far below the Planck scale, it is easier to implement in the context of supergravity than standard chaotic inflation. That the inflaton mass is small compared with the inflationary Hubble parameter is still a problem for generic supergravity theories, but remarkably this can be avoided in a natural way for a class of supergravity models which follow from orbifold compactification of superstrings. This opens up the prospect of a truly realistic, superstring

37 pages, LaTeX (3 figures available as hard copies only), SUSSEX-AST 94/1-1

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• Predictions in multifield models of inflation
• Constraint on the primordial gravitational waves from the joint analysis of BICEP2 and Planck HFI 353 GHz dust polarization data
• Fast Analytic Computation of Cosmic String Power Spectra
• Spontaneous Baryogenesis from Asymmetric Inflaton
• Leptogenesis through direct inflaton decay to light particles
• A Tale of Two Timescales: Mixing, Mass Generation, and Phase Transitions in the Early Universe
• Racetrack Potentials and the de Sitter Swampland Conjectures
• Multiple Inflationary Stages with Varying Equation of State
• Ultraviolet Regularisation in de Sitter Space
• Inhomogeneous viscous fluids for inflation
• Local Features with Large Spiky non-Gaussianities during Inflation
• D-term Inflation in Type I String Theory
• SO(10)-GUT Coherent Baryogenesis
• Exit from Inflation with a First-Order Phase Transition and a Gravitational Wave Blast
• Warm Inflation with the Standard Model
• Tilted Hybrid Inflation
• New Early Dark Energy as a solution to the $H_0$ and $S_8$ tensions
• Slow Roll during the Waterfall Regime: The Small Coupling Window for SUSY Hybrid Inflation
• Studies in Small Field Inflation
• How can we tell whether dark energy is composed by multiple fields?
• D-term Uplifted Racetrack Inflation
• A simple, exact, model of quasi-single field inflation
• Phantom Inflation with A Steplike Potential
• Spontaneous Non-thermal Leptogenesis in High-scale Inflation Models
• Initial conditions and sampling for multifield inflation
• Enlarging the parameter space of standard hybrid inflation
• SUGRA New Inflation with Heisenberg Symmetry
• Fields Annihilation and Particles Creation in DBI inflation
• Stimulated Supersymmetry Breaking
• Flipped GUT Inflation
• Simplified Smooth Hybrid Inflation in Supersymmetric SU(5)
• Inflation and the Nature of Supersymmetry Breaking
• From Hybrid to Quadratic Inflation With High-Scale Supersymmetry Breaking
• General sGoldstino Inflation
• Degenerate Neutrinos and Supersymmetric Inflation
• Sneutrino warm inflation in the minimal supersymmetric model
• N = 2 Supersymmetry in a Hybrid Inflation Model
• Inflationary Baryogenesis
• $\mu$-Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves
• Exploring Critical Overdensity Thresholds in Inflationary Models of Primordial Black Holes Formation
• Grand Unified Inflation Confronts WMAP
• A Hint of a Blue Axion Isocurvature Spectrum?
• Leptogenesis from reheating after inflation and cosmic string decay
• Standard-smooth hybrid inflation
• Affleck-Dine leptogenesis via right-handed sneutrino fields in a supersymmetric hybrid inflation model
• Field Evolution leading to hybrid inflation
• Topological Eternal Hilltop Inflation and the Swampland Criteria
• Challenges for Inverted Hybrid Inflation
• Clustering of Local Extrema in Planck CMB maps
• Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings
• Diphoton resonances in a U(1)_{B-L} extension of the minimal supesymmetric standard model
• Hybrid inflation with running inflaton mass
• Reconstructing the Local Potential of Inflation with BICEP2 data
• Brane-world cosmology
• Inflationary models with a flat potential enforced by non-abelian discrete gauge symmetries
• Constraining Modular Inflation in the MSSM from Giant Q-Ball Formation
• $\mu$-Term Hybrid Inflation and Split Supersymmetry
• Dirac Neutrinos and Hybrid Inflation from String Theory
• Classical and quantum exact solutions for a FRW in chiral like cosmology
• $R$-Symmetry Breaking in Supersymmetric Hybrid Inflation
• Non-thermal leptogenesis via direct inflaton decay without SU(2)(L) triplets
• Chaotic inflation in higher derivative gravity theories
• Primordial Black Holes and Scalar-induced Gravitational Waves in Radiative Hybrid Inflation
• New D-term chaotic inflation in supergravity and leptogenesis
• New model of axion monodromy inflation and its cosmological implications
• Dark world and baryon asymmetry from a common source
• Eliminating the eta-problem in SUGRA Hybrid Inflation with Vector Backreaction
• Dynamically Generated Inflation from Non-Riemannian Volume Forms
• Pseudosmooth Tribrid Inflation in $SU(5)$
• A Coupling of Pseudo Nambu Goldstone Bosons to Other Scalars and Role in Double Field Inflation
• Chaotic inflation in supergravity and cosmic string production
• Spinodal effect in the natural inflation model
• Cosmology or Catastrophe? A non-minimally coupled scalar in an inhomogeneous universe
• Non-thermal leptogenesis and baryon asymmetry in different neutrino mass models
• Cosmological Baryon Asymmetry and Neutrinos: Baryogenesis via Leptogenesis in Supersymmetric Theories
• Cosmic String Detection with Tree-Based Machine Learning
• New Inflation in Supersymmetric SU(5) and Flipped SU(5) GUT Models
• Hybrid inflation with moduli stabilization and low scale supersymmetry breaking
• Peak-peak correlations in the cosmic background radiation from cosmic strings
• Realizations of Hybrid Inflation in Supergravity with natural initial conditions
• Neutrino mass, dark matter and inflation
• Matching and running sensitivity in non-renormalizable inflationary models
• Smooth Hybrid Inflation and Non-Thermal Type II Leptogenesis
• The Simple Single Field Inflation Models and the Running of Spectral Index
• Gravitational waves as a probe of SUSY scale
• Inflection-point Inflation and Dark Matter Redux
• GUT Scale And Leptogenesis From 5D Inflation
• ISS-flation
• Out-of-equilibrium evolution of quantum fields in the hybrid model with quantum back reaction
• Minimalism in Inflation Model Building
• Constraints on single-field inflation with WMAP, SPT and ACT data -- A last-minute stand before Planck
• Non-Gaussianity constrains hybrid inflation
• Preheating and vacuum metastability in Supersymmetry
• Evading the pulsar constraints on the cosmic string tension in supergravity inflation
• Mutated hybrid inflation in $f(R,\square R)$-gravity
• Constraints on Supergravity Chaotic Inflationary Models
• Quintom fields from chiral K-essence cosmology
• Inflation from Supersymmetric Quantum Cosmology
• Starobinsky-like inflation and soft-SUSY breaking
• Gravity Waves and Gravitino Dark Matter in $\mu$-Hybrid Inflation
• Constraints on Higher Dimensional Models for viable Extended Inflation
• Unified Model for Inflation and Dark Energy with Planck-Scale Pseudo-Goldstone Bosons
• Curvaton and the inhomogeneous end of inflation
• Hubble-induced mass from MSSM plasma
• Preheating in Bubble Collisions
• Viable inflationary models ending with a first-order phase transition
• Successfully combining SUGRA hybrid inflation and moduli stabilisation
• Bosonic condensates in realistic supersymmetric GUT cosmic strings
• No-Scale $\mu$-Term Hybrid Inflation
• On SUSY Restoration in Single-Superfield Inflationary Models of Supergravity
• MSSM-inspired multifield inflation
• Non-Gaussianities in a two-field generalization of Natural Inflation
• $\delta T/T$ and Neutrino Masses in SU(5)
• Gravitino Dark matter, Non Thermal Leptogenesis and Low reheating temperature in No-scale Higgs Inflation
• Mechanisms for producing Primordial Black Holes from Inflationary Models Beyond Fine-Tuning
• Smooth hybrid inflation in light of ACT DR6 data
• A Bump in the Blue Axion Isocurvature Spectrum
• Identifying the inflaton with primordial gravitational waves
• Complex Hybrid Inflation and Baryogenesis
• Non-Gaussianity from false vacuum inflation: Old curvaton scenario
• Bosonic structure of realistic SO(10) SUSY cosmic strings
• Spectral indices in Eddington-inspired Born-Infeld inflation
• Embedding DBI inflation in scalar-tensor theory
• Stochastic inflation and primordial black holes
• F_D-Term Hybrid Inflation with Electroweak-Scale Lepton Number Violation
• Supersymmetric B-L inflation near the conformal coupling
• The abundance of moduli, modulini and gravitinos produced by the vacuum fluctuation
• Lambda-inflation and CMB anisotropy
• Gauge Mediation with Sequestered Supersymmetry Breaking
• Inflation, Leptogenesis, and Yukawa Quasi-Unification within a Supersymmetric Left-Right Model
• Strictly Anomaly Mediated Supersymmetry Breaking
• Comparing geometric and gravitational particle production in Jordan and Einstein frames
• Retrofitted Gravity Mediation without the Gravitino-overproduction Problem
• Supergravity, M theory and Cosmology
• Particle Physics Approach to Dark Matter
• Inflation and Inverse Symmetry Breaking
• Pseudosmooth Tribrid Inflation
• Realistic Inflation in No-Scale $U(1{)}_R$ Symmetric Flipped $SU(5)$
• Right-handed Sneutrino Inflation in SUSY B-L with Inverse Seesaw
• Cosmic strings in a space-time with positive cosmological constant
• Radiative Lifting of Flat Directions of the MSSM in de Sitter Background
• Inflation in uplifted Supergravities
• Realistic Hybrid Inflation in 5D Orbifold SO(10) GUT
• F-Term Hybrid Inflation, the η-problem and Extra Dimensions
• Power of Black Hole Physics: Seeing through the Vacuum Landscape
• Textures and Semi-Local Strings in SUSY Hybrid Inflation
• Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
• Single Field Inflation in Supergravity with a $U(1)$ Gauge Symmetry
• Inflation in Supersymmetric Cosmic String Theories
• The B-L Phase Transition: Implications for Cosmology and Neutrinos
• Preheating and Reheating Constraints in Supersymmetric Braneworld Inflation
• Large tensor spectrum of BICEP2 in the natural SUSY hybrid model
• Hybrid inflation followed by modular inflation
• Supergravity and Two-Field Inflation Effects in Right-Handed Sneutrino-Modified D-term Inflation
• Cosmological Inflation with orbifold moduli as inflatons
• CMB and Large Scale Structure as a test of Mixed Models with n>1
• Natural Hybrid Inflation Model with Large Non-Gaussianity
• A Universal Bound on Excitations of Heavy Fields during Inflation
• Can Inflation Induce Supersymmetry Breaking in a Metastable Vacuum?
• Small Yukawa Couplings from Type I String Theory and the Inflationary Solution to the Strong CP and $\mu$ Problems
• Constraining hybrid inflation models with WMAP three-year results
• Testing theories of Gravity and Supergravity with inflation and observations of the cosmic microwave background
• $\mu$-Hybrid Inflation and Metastable Cosmic Strings in $\mathbf{SU}(3{)}_{\mathbf{c}}\times \mathbf{SU}(2{)}_{\mathbf{L}}\times \mathbf{SU}(2{)}_{\mathbf{R}}\times \mathbf{U}(1{)}_{\mathbf{B}-\mathbf{L}}$
• Preheating after technicolor inflation
• Delaying the waterfall transition in warm hybrid inflation
• Alchemical Inflation: inflaton turns into Higgs
• Microwave background anisotropies in quasiopen inflation
• Modulation of the waterfall by a gauge field
• Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation
• Spectral Index and Non-Gaussianity in Supersymmetric Hybrid Inflation
• Cosmological Constraints on Rapid Roll Inflation
• Anisotropic chiral cosmology: exact solutions
• F-Term Hybrid Inflation Followed by a Peccei-Quinn Phase Transition
• Radiative Symmetry breaking, Cosmic Strings and Observable Gravity Waves in $U(1{)}_R$ symmetric $SU(5)\times U(1{)}_{\chi }$
• BICEP2, the curvature perturbation and supersymmetry
• Gauge and Modulus Inflation from 5D Orbifold SUGRA
• An update on single field models of inflation in light of WMAP7
• Exploring primordial black holes and gravitational waves with R-symmetric GUT Higgs inflation
• Smooth Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves in $SU(5)\times U(1{)}_{\chi }$ Super-GUT
• Gravitational Waves from Double Hybrid Inflation
• Curvaton Potential Terms, Scale-Dependent Perturbation Spectra and Chaotic Initial Conditions
• Inflationary scenario in the supersymmetric economical 3-3-1 model
• Dark energy in hybrid inflation
• Observable r, Gravitino Dark Matter, and Non-thermal Leptogenesis in No-Scale Supergravity
• Orbifold GUT inflation
• Correlated curvature perturbations and magnetogenesis from the GUT gauge bosons
• "Semi-Realistic" F-term Inflation Model Building in Supergravity
• Cosmological evolution of scalar fields and gravitino dark matter in gauge mediation at low reheating temperatures
• Inflationary Solution to the Strong CP and $\mu$ Problems
• Proton Decay in Supersymmetric $SU(4{)}_c\times SU(2{)}_L\times SU(2{)}_R$
• Implication of the swampland distance conjecture on the Cohen-Kaplan-Nelson bound in de Sitter space
• Evidence for Inflation in an Axion Landscape
• Strongly Coupled Inflaton
• "Old" Locked Inflation
• Non-thermal Gravitino Production in Tribrid Inflation
• Probing the Primordial Universe using Massive Fields
• The Renormalizable Three-Term Polynomial Inflation with Large Tensor-to-Scalar Ratio
• Spontaneous Discrete Symmetry Breaking During Inflation and the NMSSM Domain Wall Problem
• D-term inflation in D-brane cosmology
• Quantum Smearing in Hybrid Inflation with Chaotic Potentials
• Limits on the gravity wave contribution to microwave anisotropies
• Gauge-Mediated Curvature of the Flat Directions During Preheating
• About the isocurvature tension between axion and high scale inflationary models
• High-scale SUSY from an R-invariant New Inflation in the Landscape
• D-term inflation and neutrino mass
• Spacetime Singularities in Generalized Brans-Dicke Theories
• Supersymmetric hybrid inflation with non-minimal coupling to gravity
• Nonminimal Inflation in Supersymmetric GUTs with $U(1{)}_R\times Z_n$ Symmetry
• Inflation, moduli (de)stabilization and supersymmetry breaking
• Big Bang Nucleosynthesis constraints on the cosmological evolution in a Universe with a Weylian Boundary
• Supersymmetric Models For Gauge Inflation
• Density perturbations from both the inflaton and the curvaton
• Primordial black holes in SB SUSY Gauss-Bonnet inflation
• N-flation in Supergravity
• Inflation and Kahler Stabilization of the Dilaton
• Updated Constraints on Large Field Hybrid Inflation
• Growth of Inflaton Perturbations and the Post-Inflation Era in Supersymmetric Hybrid Inflation Models
• Heavy gravitino in hybrid inflation
• Intermediate Scale Inflation and Metastable Supersymmetry Breaking
• Testing Two-Field Inflation
• Supersymmetric Hybrid Inflation in Light of CMB Experiments and Swampland Conjectures
• Consistent cosmology with Higgs thermal inflation in a minimal extension of the MSSM
• Leptogenesis: Theory and Neutrino Masses
• Intermediate Scale Supersymmetric Inflation, Matter and Dark Energy
• Effective field theory of waterfall in hybrid inflation
• Small Field Inflation and the Spectral Index
• A Note on Gravitational Particle Production in Supergravity
• Can thermal inflation solve the monopole problem ?
• Isotropisation of flat homogeneous universes with scalar fields
• Inflation, Large Scale Structure and Particle Physics
• TwInflation
• Entropy Production in the Inflationary Epoch Using the Gouy-Stodola Theorem
• E- & T-Model Hybrid Inflation
• New Inflation in Waterfall Region
• Cosmic Strings from Tribrid Inflation
• No Warm Inflation From a Vanilla Axion
• Preheating and locked inflation: an analytic approach towards parametric resonance
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Multiscalar field cosmological model and possible solutions using Noether symmetry approach
• New method of exponential potentials reconstruction based on given scale factor in phantonical two-field models
• Supersymmetry breaking and loop corrections at the end of inflation
• A viable D-term hybrid inflation
• Beginning of Universe through large field hybrid inflation
• General Solutions for Tunneling of Scalar Fields with Quartic Potentials in de Sitter Space
• Early Universe in the SU(3)_L X U(1)_X electroweak models
• Leptogenesis Scenarios via Non-Thermally Produced Right-handed Neutrino and Sneutrino in Supersymmetric Seesaw Model
• Supersymmetric hybrid inflation with a light scalar
• Quantum back-reaction of the superpartners in a large-N supersymmetric hybrid model
• Two-Field Q-ball Solutions of Supersymmetric Hybrid Inflation
• Eigenvalues of the Stewart-Lyth equation for inflation with a blue spectrum
• On the prospects of thermalization of axion-SU(2) inflation
• Inflation: From Theory to Observation and Back
• Exact inflationary solutions
• Effects of Variable Newton Constant During Inflation
• Peccei-Quinn field for inflation, baryogenesis, dark matter, and much more
• Anatomy of geometrical destabilization of inflation
• Supersymmetric hybrid inflation and current-carrying metastable cosmic strings in $SU(4{)}_c\times SU(2{)}_L\times U(1{)}_R$
• Smooth $\mu$-Hybrid and Non-Minimal Higgs Inflation in $SU(4{)}_C\times SU(2{)}_L\times SU(2{)}_R$ With Observable Gravitational Waves
• Inflation from Susy quantum cosmology
• Axion, mu Term, and Supersymmetric Hybrid Inflation
• New Inflation in the Landscape and Typicality of the Observed Cosmic Perturbation
• Stochastic quintessence models: jerk and fine-structure variability constraints
• Particle motion in weak relativistic gravitational fields
• Inflation, Proton Decay and Gravitational Waves from Metastable Strings in $SU(4{)}_C\times SU(2{)}_L\times U(1{)}_R$ Model
• Glueball Inflation and Gauge/Gravity Duality
• Supergravity Contributions to Inflation in models with non-minimal coupling to gravity
• Smooth hybrid inflation in a supersymmetric axion model
• GUT-scale inflation with sizeable tensor modes
• Flat Direction Dynamics in a Non-Topological Soliton-Dominated Universe
• Higgs-Squark-Slepton Inflation from the MSSM
• Some Advantages of SUSY SU(4) x SU(2)_L x SU(2)_R Model in String Derived SO(10) GUTs
• F-term Inflation in M-theory with Five-branes
• F-Term Inflation Q-Balls
• u^{c}d^{c}d^{c}-Based Affleck-Dine Baryogenesis
• Cosmic Strings-induced CMB anisotropies in light of Weighted Morphology
• Cosmological Stasis from Field-Dependent Decay
• String Loop Moduli Stabilisation and Cosmology in IIB Flux Compactifications
• Leptogenesis and Reheating in Complex Hybrid Inflation
• WMAP constraint on the P-term inflationary model
• Inflation and Leptogenesis in a $U(1)$-enhanced supersymmetric model
• Clarifying Inflation Models: the Precise Inflationary Potential from Effective Field Theory and the WMAP data
• Nonminimal Couplings and the Forgotten Field of Axion Inflation
• Testing Spontaneous Parity Violation at the LHC
• The cusp properties of High Harmonic Loops
• Supersymmetric inflation and baryogenesis via Extra-Flat directions of the MSSM
• High-harmonic cosmic strings and gravitational waves
• Constraints on Inflation Models from Supersymmetry Breakings
• Initial time singularities and admissible initial states for a system of coupled scalar fields
• Inflationary predictions at small gamma
• Modified hybrid inflation in no-scale SUGRA with suppressed $R$-symmetry breaking
• Refitting cosmological data with neutrino mass and degeneracy
• Affleck-Dine leptogenesis and its backreaction to inflaton dynamics
• Inflation with vector fields revisited: heavy entropy perturbations and primordial black holes
• Generic no-scale inflation inspired from string theory compactifications
• Large Field Inflation in Supergravity
• Slow-walking inflation
• Hybrid Inflation Exit through Tunneling
• Angular Power Spectrum in Modular Invariant Inflation Model
• Inflation and Unification
• GUT cosmic strings and inflation
• Quintessence and false vacuum: Two sides of the same coin?
• Resurrecting Vanilla Power Law Inflation with the aid of Continuous Spontaneous Localization in the ACT era
• Hidden in the background: a local approach to CMB anomalies
• Collapse of a Superhorizon-sized Void in the Early Universe
• $F$-term Multi-Field Inflation in Supergravity without Stabiliser Superfields
• Initial conditions in hybrid inflation: exploration by MCMC technique
• U(1)${}_{B-L}$ Symmetry Restoration and Effective Neutrino Species
• O'R Inflation in $F$-term Supergravity
• Chaotic Inflation from the MSSM Along Flat $D$-Term Trajectory
• Inflation: a quantum laboratory on cosmological scales
• Testing a Two Field Inflation Beyond the Slow-Roll Approximation
• Curvature perturbations from vacuum transition during inflation
• First Order Inflation in General Relativity
• A double-running inflaton mass for a flat potential and an assisted hilltop inflation
• Light Scalars and the Cosmos: Nambu-Goldstone and Otherwise
• No-Scale Supergravity in the Light of LHC and Planck
• Modulus D-term Inflation
• Inflation in a Gaussian Random Landscape
• Inflation and B-L breaking scale
• Inflation from IIB Superstrings with Fluxes
• Hybrid Inflation in Quasi-minimal Supergravity with Monotonic Inflationary Potentia
• Minimal gauge inflation
• Retrofitting Models of Inflation
• Phenomenology of SUGRA Extensions of the Starobisnky Model
• The (relative) size does not matter in inflation
• Brane inflation and the fine-tuning problem
• Loop quantum inflation with inverse volume corrections in light of ACT data
• Towards an analytic solution of rapid roll inflation with a quartic potential
• Phenomenology and Cosmology of Supersymmetric Grand Unified Theories
• SUSY, Inflation and the Origin of Matter in the Universe
• D-Term Inflation: The Good, the Bad and the Ugly
• Couplings and spectra in modular inflation
• The 14 TeV LHC Takes Aim at SUSY: A No-Scale Supergravity Model for LHC Run 2