Trans-Planckian Issues for Inflationary Cosmology

Abstract

The accelerated expansion of space during the period of cosmological inflation leads to trans-Planckian issues which need to be addressed. Most importantly, the physical wavelength of fluctuations which are studied at the present time by means of cosmological observations may well originate with a wavelength smaller than the Planck length at the beginning of the inflationary phase. Thus, questions arise as to whether the usual predictions of inflationary cosmology are robust considering our ignorance of physics on trans-Planckian scales, and whether the imprints of Planck-scale physics are at the present time observable. These and other related questions are reviewed in this article.

32 pages, 11 figures; invited review for "Classical and Quantum Gravity"

References in corpus (20)

• Quantum Gravity at a Lifshitz Point
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• Horava-Lifshitz Cosmology: A Review
• De Sitter Space and Eternity
• On the one loop corrections to inflation and the CMB anisotropies
• The IR stability of de Sitter: Loop corrections to scalar propagators
• Tensor Modes from a Primordial Hagedorn Phase of String Cosmology
• String Gas Cosmology and Structure Formation
• On the One Loop Corrections to Inflation II: The Consistency Relation
• On the proper treatment of massless fields in Euclidean de Sitter space
• Inflationary Perturbations: the Cosmological Schwinger Effect
• IR divergence does not affect the gauge-invariant curvature perturbation
• Hunting Down the Best Model of Inflation with Bayesian Evidence
• The Zeta-Zeta Correlator Is Time Dependent
• Cosmological UV/IR Divergences and de-Sitter Spacetime
• Constraints on Kinetically Modified Inflation from WMAP5
• Non-singular string cosmology in a 2d Hybrid model
• The scalar bi-spectrum during preheating in single field inflationary models
• The Trans-Planckian Problem in the Healthy Extension of Horava-Lifshitz Gravity
• Possibly Large Corrections to the Inflationary Observables

Cited by in corpus (124)

• Bouncing Cosmologies: Progress and Problems
• A Critical Review of Classical Bouncing Cosmologies
• Trans-Planckian Censorship and the Swampland
• Pre-inflationary universe in loop quantum cosmology
• Detailed analysis of the predictions of loop quantum cosmology for the primordial power spectra
• Bounce inflation in $f(T)$ Cosmology: A unified inflaton-quintessence field
• Inflation after Planck: Judgment Day
• Robust Inflation from Fibrous Strings
• Probing the scale invariance of the inflationary power spectrum in expanding quasi-two-dimensional dipolar condensates
• Infrared dynamics of the massive ${\varphi }^4$ theory on de Sitter space
• The challenge of ruling out inflation via the primordial graviton background
• Primordial backgrounds of relic gravitons
• Phenomenology of theories of gravity without Lorentz invariance: the preferred frame case
• Universal features of quantum bounce in loop quantum cosmology
• Trans-Planckian Censorship, Inflation and Dark Matter
• Trans-Planckian censorship and other swampland bothers addressed in warm inflation
• Canonical transformations and squeezing formalism in cosmology
• Unique Fingerprints of Alternatives to Inflation in the Primordial Power Spectrum
• Combining Universal and Odd RR Axions for Aligned Natural Inflation
• Preinflationary dynamics in loop quantum cosmology: Monodromy Potential
• Pre-inflationary dynamics in loop quantum cosmology: Power-law potentials
• Non-Gaussianity in Loop Quantum Cosmology
• Inflationary cosmology with nonlinear dispersion relations
• Inflation and Alternatives with Blue Tensor Spectra
• Trans-Planckian Censorship Conjecture and Non-thermal post-inflationary history
• Quantum-gravity effects for excited states of inflationary perturbations
• ${\alpha }^{\prime }$-Cosmology: solutions and stability analysis
• Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
• Strengthening the TCC Bound on Inflationary Cosmology
• Primordial quantum nonequilibrium and large-scale cosmic anomalies
• Could PBHs and secondary GWs have originated from squeezed initial states?
• Observational tests of the self-dual spacetime in loop quantum gravity
• Gravitational quantum effects on power spectra and spectral indices with higher-order corrections
• Phenomenological implications of modified loop cosmologies: an overview
• Non-adiabatic Evolution of Primordial Perturbations and non-Gaussinity in Hybrid Approach of Loop Quantum Cosmology
• Scalar and tensor perturbations in loop quantum cosmology: High-order corrections
• High-order Primordial Perturbations with Quantum Gravitational Effects
• Detecting quantum gravitational effects of loop quantum cosmology in the early universe?
• Primordial Spectra of slow-roll inflation at second-order with the Gauss-Bonnet correction
• Trans-Planckian censorship and single-field inflaton potential
• Inflationary spectra with inverse-volume corrections in loop quantum cosmology and their observational constraints from Planck 2015 data
• Preinflationary dynamics of $\alpha -$attractor in loop quantum cosmology
• de Sitter Space as a Glauber-Sudarshan State
• Quantum correlations for the metric
• Quantum field theory of relic nonequilibrium systems
• Constructing analytical solutions of linear perturbations of inflation with modified dispersion relations
• Relaxing the TCC Bound on Inflationary Cosmology?
• Cosmological bounces in spatially flat FRW spacetimes in metric f(R) gravity
• Scale-dependent power spectrum from initial excited-de Sitter modes
• Trans-Planckian Censorship and Inflation in Grand Unified Theories
• Swampland, Trans-Planckian Censorship and Fine-Tuning Problem for Inflation: Tunnelling Wavefunction to the Rescue
• Pre-inflationary dynamics of Starobinsky inflation and its generization in Loop Quantum Brans-Dicke Cosmology
• Spectrum of Cuscuton Bounce
• Cosmic fluctuations from quantum effective action
• Mass bound for primordial black hole from trans-Planckian censorship conjecture
• Background dynamics of pre-inflationary scenario in Brans-Dicke loop quantum cosmology
• Gravitational quantum effects in the light of BICEP2 results
• Non-Standard Cosmological Models and the trans-Planckian Censorship Conjecture
• On the Trans-Planckian Censorship Conjecture and the Generalized Non-Minimal Coupling
• Renormalization group inspired autonomous equations for secular effects in de Sitter space
• Bell inequalities violation within non-Bunch-Davies states
• From the string vacuum to FLRW or de Sitter via ${\alpha }^{\prime }$ corrections
• No-boundary Wave Function, Wheeler-DeWitt Equation and Path Integral Analysis of the Bouncing `Quantum' Cosmology
• The Quantum Corrected Mode Function and Power Spectrum for a Scalar Field during Inflation
• Non-Linear Trans-Planckian Corrections of Spectra due to the Non-trivial Initial States
• Optimal CMB estimators for bispectra from excited states
• Explanatory Depth in Primordial Cosmology: A Comparative Study of Inflationary and Bouncing Paradigms
• Corrections to $n_s$ and $n_t$ from high scale physics
• A first step towards the inflationary trans-planckian problem treatment in Loop Quantum Cosmology
• Bouncing with shear: Implications from quantum cosmology
• $f(T)$ cosmology: From Pseudo-Bang to Pseudo-Rip
• Revisiting pre-inflationary universe of family of $\alpha -$attractor in loop quantum cosmology
• Non-Bunch-Davies Anisotropy
• On the TransPlanckian Censorship Conjecture in Holographic Cosmology
• Thermodynamics of the R_h=ct Universe: A Simplification of Cosmic Entropy
• Constraining the Barbero-Immirzi parameter from the duration of inflation in loop quantum cosmology
• No Smooth Spacetime in Lorentzian Quantum Cosmology and Trans-Planckian Physics
• Missing large-angle correlations versus even-odd point-parity imbalance in the cosmic microwave background
• Intricacies of Cosmological bounce in polynomial metric $f(R)$ gravity for flat FLRW spacetime
• Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
• Scalar Cosmological Perturbations from Quantum Entanglement within Lorentzian Quantum Gravity
• Quantum Fisher Cosmology: Confronting Observations and the Trans-Planckian Problem
• A Measurement of the Cosmic Expansion Within our Lifetime
• Power Spectra of Slow-Roll inflation in the consistent $D\to 4$ Einstein-Gauss-Bonnet gravity
• Conserved cosmological perturbations in USR inflation and bouncing scenarios
• Can observations look back to the beginning of inflation?
• Limits on Entanglement Effects in the String Landscape from Planck and BICEP/Keck Data
• Enhanced spectrum of primordial perturbations, galaxy formation and small scale structure
• Holographic cosmology solutions of problems with pre-inflationary cosmology
• Quantum Entanglement in Multi-field Inflation
• A resolution of the Trans-Planckian problem in the R_h=ct universe
• Higher Order Corrections to Asymptotic-de Sitter Inflation
• Scalar Cosmological Perturbations from Quantum Gravitational Entanglement
• Trans-Planckian Effects in Warm Inflation
• Expansion-contraction duality breaking in a Planck-scale sensitive cosmological quantum simulator
• Trans-Planckian Philosophy of Cosmology
• Accelerated paths and Unruh effect I: scalars and fermions in Anti De Sitter spacetime
• Emergent universe revisited through the CSL theory
• Conditions for the Absence of Infrared Sensitivity in Cosmological Probes in Any Gravity Theories
• $\alpha$-attractor potentials in loop quantum cosmology
• Inflationary Cosmology with Quantum Gravitational Effects and the Swampland Conjectures
• No smooth spacetime: Exploring primordial perturbations in Lorentzian quantum cosmology
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Spectral Distortion Signatures of Step-like Inflationary Potential
• Loop Quantum Cosmology with a noncommutative quantum deformed photon gas
• Trans-Planckian Effect in $f(R)$ Cosmology
• Life of cosmological perturbations in MDR models, and the prospect of travelling primordial gravitational waves
• Confronting dark energy in Harada's Conformal Killing Gravity with observational data
• Large $r$ against Trans-Planckian Censorship in Scalar-Tensor Theory?
• Superimposed Oscillations in Brane Inflation
• Quantum Fisher information of a cosmic qubit undergoing non-Markovian de Sitter evolution
• Tensor Fluctuations in the Early Universe
• The Role of Torsion in Trans-Planckian Physics
• A (strictly) contemporary perspective on trans-Planckian censorship
• Initial conditions of pre-inflation with Hilltop potential in loop quantum cosmology
• The Trans-Planckian Censorship Conjecture in different frameworks of viable inflation
• Cosmology and short-distance gravity
• Stable initial conditions and analytical investigations of cosmological perturbations in a modified loop quantum cosmology
• Probability of the Initial Conditions for Inflation and Slow Contraction
• UV Effects and Short-Lived Hawking Radiation: Alternative Resolution of Information Paradox
• Wave function of the universe in the presence of trans-Planckian censorship
• A New Approach to Flatness, Horizon and Late-time Accelerating Expansion Problems on the basis of Mach Principle
• Superluminal modes in a quantum field simulator for cosmology from analog trans-Planckian physics
• Scale-dependence in DHOST inflation