Stringy-Running-Vacuum-Model Inflation: from primordial Gravitational Waves and stiff Axion Matter to Dynamical Dark Energy

Abstract

In previous works we have derived a Running Vacuum Model (RVM) for a string Universe, which provides an effective description of the evolution of 4-dimensional string-inspired cosmologies from inflation till the present epoch. In the context of this "stringy RVM" version, it is assumed that the early Universe is characterised by purely gravitational degrees of freedom, from the massless gravitational string multiplet, including the antisymmetric tensor field. The latter plays an important role, since its dual gives rise to a `stiff' gravitational-axion "matter", which in turn couples to the gravitational anomaly terms, assumed to be non-trivial at early epochs. In the presence of primordial gravitational wave (GW) perturbations, such anomalous couplings lead to an RVM-like dynamical inflation, without external inflatons. We review here this framework and discuss potential scenarios for the generation of such primordial GW, among which the formation of unstable domain walls, which eventually collapse in a non-spherical-symmetric manner, giving rise to GW. We also remark that the same type of "stiff" axionic matter could provide, upon the generation of appropriate potentials during the post-inflationary eras, (part of) the Dark Matter (DM) in the Universe, which could well be ultralight, depending on the parameters of the string-inspired model. All in all, the new (stringy) mechanism for RVM-inflation preserves the basic structure of the original (and more phenomenological) RVM, as well as its main advantages: namely, a mechanism for graceful exit and for generating a huge amount of entropy capable of explaining the horizon problem. It also predicts axionic DM and the existence of mild dynamical Dark Energy (DE) of quintessence type in the present universe, both being "living fossils" of the inflationary stages of the cosmic evolution.

arXiv comment75 pages revtex, 6 pdf figures incorporated

References in corpus (86)

• Axion Cosmology
• String Axiverse
• The holographic principle
• Axions In String Theory
• On the Geometry of the String Landscape and the Swampland
• Primordial Black Holes as Dark Matter
• Encyclopaedia Inflationaris
• First Law of Thermodynamics and Friedmann Equations of Friedmann-Robertson-Walker Universe
• Chern-Simons Modification of General Relativity
• Distance and de Sitter Conjectures on the Swampland
• Dilatonic Black Holes in Higher Curvature String Gravity
• The clustering of massive Primordial Black Holes as Dark Matter: measuring their mass distribution with Advanced LIGO
• Bose-Einstein Condensation of Dark Matter Axions
• Massive Primordial Black Holes from Hybrid Inflation as Dark Matter and the seeds of Galaxies
• Standard Model CP-violation and Baryon asymmetry
• Singularity-free cosmological solutions of the superstring effective action
• Bounds on Slow Roll and the de Sitter Swampland
• Unified First Law and Thermodynamics of Apparent Horizon in FRW Universe
• Cosmic Holography
• Standard Model CP-violation and Baryon asymmetry Part II: Finite Temperature
• Dark matter production in the early Universe: beyond the thermal WIMP paradigm
• Cosmological constant and vacuum energy: old and new ideas
• Leptogenesis from Gravity Waves in Models of Inflation
• On the possible running of the cosmological "constant"
• The scaling evolution of cosmological constant
• Gravitational Wave signatures of inflationary models from Primordial Black Hole Dark Matter
• On the scaling behavior of the cosmological constant and the possible existence of new forces and new light degrees of freedom
• First evidence of running cosmic vacuum: challenging the concordance model
• Cosmology with a stiff matter era
• The $H_0$ tension in light of vacuum dynamics in the Universe
• Massive Primordial Black Holes as Dark Matter and their detection with Gravitational Waves
• Dark energy: a quantum fossil from the inflationary Universe?
• Expansion History with Decaying Vacuum: A Complete Cosmological Scenario
• Hidden supersymmetry of domain walls and cosmologies
• Hints of dynamical vacuum energy in the expanding Universe
• Possible signals of vacuum dynamics in the Universe
• Complete Cosmic History with a dynamical Lambda(H) term
• Domain Walls in Supersymmetric Yang-Mills Theories
• Brans-Dicke gravity with a cosmological constant smoothes out $\Lambda$CDM tensions
• Primordial Black Holes as a Probe of Cosmology and High Energy Physics
• The $\bar{\Lambda }CDM$ cosmology: from inflation to dark energy through running $\Lambda$
• Dynamical dark energy versus $\Lambda =$const. in light of observations
• Density perturbations for running vacuum: a successful approach to structure formation and to the ${\sigma }_8$-tension
• A supersymmetric D-brane Model of Space-Time Foam
• Cosmologies with a time dependent vacuum
• Running vacuum in quantum field theory in curved spacetime: renormalizing ${\rho }_{vac}$ without $\sim m^4$ terms
• Dynamical dark energy: scalar fields and running vacuum
• Gravitational and Chiral Anomalies in the Running Vacuum Universe and Matter-Antimatter Asymmetry
• Gravitational Waves from Collapsing Vacuum Domains
• Cosmological constant, renormalization group and Planck scale physics
• Brans-Dicke cosmology with a $\Lambda$- term: a possible solution to $\Lambda$CDM tensions
• The Case for Axion Dark Matter
• Implications of a Stochastic Microscopic Finsler Cosmology
• Asymptotically Safe Starobinsky Inflation
• A Microscopic Liouville Arrow of Time
• Relaxing the ${\sigma }_8$-tension through running vacuum in the Universe
• Potentials between D-Branes in a Supersymmetric Model of Space-Time Foam
• Liouville Cosmology at Zero and Finite Temperatures
• Quantum Anomalies in String-Inspired Running Vacuum Universe: Inflation and Axion Dark Matter
• D-Matter
• Nonsingular Decaying Vacuum Cosmology and Entropy Production
• Axion Dark Matter and Cosmological Parameters
• Domain-wall/Cosmology correspondence in adS/dS supergravity
• Inflation induced by Gravitino Condensation in Supergravity
• Thermodynamical aspects of running vacuum models
• Starobinsky-type Inflation in Dynamical Supergravity Breaking Scenarios
• The cosmological constant and entropy problems: mysteries of the present with profound roots in the past
• Time-Dependent Vacuum Energy Induced by D-Particle Recoil
• Dynamical Supergravity Breaking via the Super-Higgs Effect Revisited
• The role of temperature dependent string-inspired CPT violating backgrounds in leptogenesis and the chiral magnetic effect
• Inflation via Gravitino Condensation in Dynamically Broken Supergravity
• D-Foam Phenomenology: Dark Energy, the Velocity of Light and a Possible D-Void
• Leptogenesis from Heavy Right-Handed Neutrinos in CPT Violating Backgrounds
• Dissipative Liouville Cosmology: A Case Study
• Large scale structure from biased non-equilibrium phase transitions - percolation theory picture
• Gravitational Waves as a Probe of the Gravitino Mass
• Do we Come from a Quantum Anomaly?
• Domain walls and instantons in N=1, d=4 supergravity
• Axion-Dilaton Domain Walls and Fake Supergravity
• The D-material universe
• Scalar Field Theory Description of the Running Vacuum Model: the Vacuumon
• Stringy Models of Modified Gravity: Space-time defects and Structure Formation
• Curvature and thermal corrections in tree-level CPT-Violating Leptogenesis
• String-Inspired Running Vacuum, the "Vacuumon", and the Swampland Criteria
• Supercritical String Cosmology drains the Swampland
• Stringy Domain Walls of N=1, D=4 Supergravity

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• Challenges for $\Lambda$CDM: An update
• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Renormalizing the vacuum energy in cosmological spacetime: implications for the cosmological constant problem
• The Cosmological Constant Problem and Running Vacuum in the Expanding Universe
• Running vacuum in the Universe: phenomenological status in light of the latest observations, and its impact on the ${\sigma }_8$ and $H_0$ tensions
• Testing spatial curvature and anisotropic expansion on top of the $\Lambda$CDM model
• Big Bang Nucleosynthesis constraints on higher-order modified gravities
• Equation of state of the running vacuum
• Inflationary physics and transplanckian conjecture in the Stringy Running-Vacuum-Model: from the phantom vacuum to the true vacuum
• Phantom matter: a challenging solution to the cosmological tensions
• Composite Dark Energy and the Cosmological Tensions
• Running vacuum in QFT in FLRW spacetime: The dynamics of ${\rho }_{\mathrm{vac}}(H)$ from the quantized matter fields
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Torsion in string-inspired cosmologies and the universe dark sector
• Stringy Running Vacuum Model and current Tensions in Cosmology
• Primordial Black Holes and Gravitational Waves in Multi-Axion-Chern-Simons Inflation
• Running vacuum in Brans-Dicke theory: a possible cure for the ${\sigma }_8$ and $H_0$ tensions
• Running vacuum versus Holographic dark energy: a cosmographic comparison
• Artificial Dynamical Effects in Quantum Field Theory
• Geometrical origins of the Universe dark sector: string-inspired torsion and anomalies as seeds for inflation and dark matter
• Torsion at different scales: from materials to the Universe
• Multi-fluid cosmology in Einstein gravity: analytical solutions
• Dynamical systems of cosmological models for different possibilities of $G$ and ${\rho }_{\Lambda }$
• Cosmological constraints on time-varying cosmological terms: A study of FLRW universe models with $\Lambda (t)$CDM cosmology
• Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review
• Quantum Discrete Levels of the Universe from the Early Trans-Planckian Vacuum to the Late Dark Energy
• Signature flips in time-varying $\Lambda (t)$ cosmological models with observational data
• Global Portraits of Nonminimal Inflation: Metric and Palatini
• Running vacuum and H^4-inflation
• Quantum-Ordering Ambiguities in Weak Chern-Simons 4D Gravity and Metastability of the Condensate-Induced Inflation
• The dynamics of vacuum, gravity and matter: Implications on the fundamental constants
• Thermodynamics of sign-switching dark energy models
• Dynamical-System analysis of single-axion monodromy inflation with periodically-modulated potentials
• Quantizing a Non-locally Massive 2-form Model
• Stochastic gravitational wave background from the collisions of dark matter halos