Perturbative unitarity and NEC violation in genesis cosmology
arXiv:2207.11772 · doi:10.1007/JHEP10(2022)140
Abstract
Explorations of the violation of null energy condition (NEC) in cosmology could enrich our understanding of the very early universe and the related gravity theories. Although a fully stable NEC violation can be realized in the ``beyond Horndeski'' theory, it remains an open question whether a violation of the NEC is allowed by some fundamental properties of UV-complete theories or the consistency requirements of effective field theory (EFT). We investigate the tree-level perturbative unitarity for stable NEC violations in the contexts of both Galileon and ``beyond Horndeski'' genesis cosmology, in which the universe is asymptotically Minkowskian in the past. We find that the constraints of perturbative unitarity imply that we may need some unknown new physics below the cut-off scale of the EFT other than that represented by the ``beyond Horndeski'' operators.
arXiv comment32 pages, 5 figures; updated to match the published version
References in corpus (99)
- Generalized G-inflation: Inflation with the most general second-order field equations
- The Effective Field Theory of Inflation
- From k-essence to generalised Galileons
- Healthy theories beyond Horndeski
- Inflationary spacetimes are not past-complete
- Degenerate higher derivative theories beyond Horndeski: evading the Ostrogradski instability
- On the Cosmological Implications of the String Swampland
- Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies
- The Effective Field Theory of Dark Energy
- Exploring gravitational theories beyond Horndeski
- Towards a Nonsingular Bouncing Cosmology
- Essential Building Blocks of Dark Energy
- Eternal inflation and the initial singularity
- Null energy condition and superluminal propagation
- Galilean Genesis: an alternative to inflation
- Dark Energy and Modified Gravity in Degenerate Higher-Order Scalar-Tensor (DHOST) theories: a review
- G-Bounce
- Bouncing Universe with Quintom Matter
- Scalar-tensor theories and modified gravity in the wake of GW170817
- Trans-Planckian Censorship and Inflationary Cosmology
- The Null Energy Condition and its violation
- Energy's and amplitudes' positivity
- A unifying description of dark energy
- A Nonsingular Cosmology with a Scale-Invariant Spectrum of Cosmological Perturbations from Lee-Wick Theory
- Positivity Bounds for Scalar Theories
- Bouncing Galileon Cosmologies
- Suppressing CMB Quadrupole with a Bounce from Contracting Phase to Inflation
- Effective Description of Higher-Order Scalar-Tensor Theories
- A Cosmological Super-Bounce
- Generic instabilities of non-singular cosmologies in Horndeski theory: a no-go theorem
- Classically stable non-singular cosmological bounces
- The Cosmological Optical Theorem
- The Effective Field Theory of nonsingular cosmology
- Effective Field Theory of Cosmological Perturbations
- Cosmological Cutting Rules
- Generalized Galileons: instabilities of bouncing and Genesis cosmologies and modified Genesis
- Two Field Matter Bounce Cosmology
- Obtaining the CMB anomalies with a bounce from the contracting phase to inflation
- Fully stable cosmological solutions with a non-singular classical bounce
- Nearly Scale-Invariant Spectrum of Adiabatic Fluctuations May be from a Very Slowly Expanding Phase of the Universe
- Towards Anisotropy-Free and Non-Singular Bounce Cosmology with Scale-invariant Perturbations
- Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce
- Stability of Geodesically Complete Cosmologies
- A covariant Lagrangian for stable nonsingular bounce
- Subluminal Galilean Genesis
- Possible Explanation to Low CMB Quadrupole
- The Effective Field Theory of nonsingular cosmology: II
- Cosmological bounce and Genesis beyond Horndeski
- G-Bounce Inflation: Towards Nonsingular Inflation Cosmology with Galileon Field
- The bounce universe history from unimodular gravity
- A Galileon Design of Slow Expansion
- DBI Realizations of the Pseudo-Conformal Universe and Galilean Genesis Scenarios
- Non-Singular Bouncing Cosmology: Consistency of the Effective Description
- On the time evolution of cosmological correlators
- DBI Genesis: An Improved Violation of the Null Energy Condition
- DHOST Bounce
- Can Universe Experience Many Cycles with Different Vacua ?
- Unbraiding the Bounce: Superluminality around the Corner
- NEC violation in mimetic cosmology revisited
- Generalized multi-Galileons, covariantized new terms, and the no-go theorem for non-singular cosmologies
- Galilean Creation of the Inflationary Universe
- From Satisfying to Violating the Null Energy Condition
- Inflation from Minkowski Space
- Bounce beyond Horndeski with GR asymptotics and -crossing
- Intermittent null energy condition violations during inflation and primordial gravitational waves
- Unitary null energy condition violation in cosmologies
- Cosmological bounces and Lorentzian wormholes in Galileon theories with an extra scalar field
- A Galileon Design of Slow Expansion: II
- Propagating speed of primordial gravitational waves and inflation
- Is there an effect of a nontrivial during inflation?
- Generalized Galilean Genesis
- Emergent Universe and Genesis from the DHOST Cosmology
- Inflation in Motion: Unitarity Constraints in Effective Field Theories with Broken Lorentz Symmetry
- Consistent NEC-violation: towards creating a universe in the laboratory
- Genesis with general relativity asymptotics in beyond Horndeski theory
- Bounce Inflation Cosmology with Standard Model Higgs Boson
- Pre-inflation and Trans-Planckian Censorship
- Higher order derivative coupling to gravity and its cosmological implications
- Primordial perturbations with pre-inflationary bounce
- Toward evading the strong coupling problem in Horndeski genesis
- Scale-Invariant Fluctuations from Galilean Genesis
- Bounce in GR and higher-order derivative operators
- Primordial non-Gaussianities of scalar and tensor perturbations in general bounce cosmology: Evading the no-go theorem
- Generating enhanced primordial GWs during inflation with intermittent violation of NEC and diminishment of GW propagating speed
- The slow expansion with nonminimal derivative coupling and its conformal dual
- Improved DHOST Genesis
- Bounce and cyclic cosmology in weakly broken galileon theories
- Pre-inflationary genesis with CMB B-mode polarization
- Horndeski genesis: consistency of classical theory
- Can non-minimal coupling restore the consistency condition in bouncing universes?
- Implication of GW170817 for cosmological bounces
- Probing the primordial universe with gravitational waves detectors
- Scale-invariant perturbations from NEC violation: A new variant of Galilean Genesis
- Subluminal cosmological bounce beyond Horndeski
- Perturbative Unitarity of Inflationary Models with Features
- Primordial Perturbations During a Slow Expansion
- Perturbations of bounce inflation scenario from modified gravity revisited
- Perturbative unitarity in quasi-single field inflation
- Stable non-singular cosmologies in beyond Horndeski theory and disformal transformations
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- Null energy condition violation during inflation and pulsar timing array observations
- Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
- Stable cosmological solutions in Horndeski theory
- Primordial non-Gaussianity from Galilean Genesis without strong coupling problem
- Constraints on Inflation with Null Energy Condition Violation from Advanced LIGO and Advanced Virgo's First Three Observing Runs
- Null energy condition violation and beyond Horndeski physics in light of DESI DR2 data
- Detecting a Gravitational-Wave Background from Inflation with Null Energy Condition Violation: Prospects for Taiji
- Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
- NEC violation in gravity in the context of a non-canonical theory via modified Raychaudhuri equation
- Climbing over the potential barrier during inflation via null energy condition violation
- How Much NEC Breaking Can the Universe Endure?
- Can Horndeski Genesis be Nonpathological?
- Constraining matter-bounce scenario from scalar-induced vector perturbations
- Gravitational Waves from Primordial Black Holes formed by Null Energy Condition Violation during Inflation