Late-time Cosmology without Dark Sector but with Closed String Massless Sector

Abstract

We explore the possibility of solving the dark energy and the coincidence problems by postulating the massless sector of closed strings. This sector constitutes the gravitational multiplet of string theory and, when applied to four-dimensional cosmology, predicts that \textit{the expansion of an open Universe defined in string frame is readily accelerating}. We confront the prediction with the late-time cosmological data of Type Ia supernovae and quasar absorption spectrum, which probe the evolutions of the Hubble parameter and possibly the fine-structure constant. We report that these observations are in admirable agreement with the prediction without any dark sector or coincidence problem. We estimate the Hubble constant, $H_0\simeq 71.2\pm 0.2km/s/Mpc$.

v4) 11+8 pages, 6+9 figures: same as v3) except figure files which are now in a lightweight JPG format. PLB contains the original figures in PDF format

References in corpus (67)

• emcee: The MCMC Hammer
• The Confrontation between General Relativity and Experiment
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• Chameleon Fields: Awaiting Surprises for Tests of Gravity in Space
• Data Tables for Lorentz and CPT Violation
• The fundamental constants and their variation: observational status and theoretical motivations
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• Double Field Theory
• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• Flux compactifications in string theory: a comprehensive review
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• Distance and de Sitter Conjectures on the Swampland
• Generalized metric formulation of double field theory
• Dark Matter and Dark Energy Interactions: Theoretical Challenges, Cosmological Implications and Observational Signatures
• On the Cosmological Implications of the String Swampland
• Dark Matter and Dark Energy
• Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra
• Detecting Dark Energy in Orbit -- the Cosmological Chameleon
• Quintessence as a run-away dilaton
• Violations of the equivalence principle in a dilaton-runaway scenario
• Background independent action for double field theory
• Runaway dilaton and equivalence principle violations
• Bouncing Cosmologies: Progress and Problems
• Forces inside hadrons: pressure, surface tension, mechanical radius, and all that
• Possible evidence for a variable fine structure constant from QSO absorption lines: motivations, analysis and results
• What if string theory has no de Sitter vacua?
• The gauge algebra of double field theory and Courant brackets
• Aspects of the cosmological "coincidence problem"
• Spatial variation in the fine-structure constant -- new results from VLT/UVES
• Trans-Planckian Censorship and Inflationary Cosmology
• On the de Sitter swampland criterion
• Stringy differential geometry, beyond Riemann
• TASI Lectures on the Cosmological Constant
• String Gas Cosmology and Structure Formation
• Trace anomaly as signature of conformality in neutron stars
• The pressure distribution and shear forces inside the proton
• Supersymmetric Double Field Theory: Stringy Reformulation of Supergravity
• Covariant action for a string in doubled yet gauged spacetime
• Stringy Unification of Type IIA and IIB Supergravities under N=2 D=10 Supersymmetric Double Field Theory
• Duality Invariant Cosmology to all Orders in ${\alpha }^{\prime }$
• Incorporation of fermions into double field theory
• Ramond-Ramond Cohomology and O(D,D) T-duality
• Deceleration versus Acceleration Universe in Different Frames of $F(R)$ Gravity
• Limiting P-odd interactions of cosmic fields with electrons, protons and neutrons
• Double field formulation of Yang-Mills theory
• O$(d,d)$ covariant String Cosmology to all orders in ${\alpha }^{\prime }$
• Non-perturbative de Sitter vacua via ${\alpha }^{\prime }$ corrections
• Einstein Double Field Equations
• Remarks on the non-Riemannian sector in Double Field Theory
• Time variation of proton-electron mass ratio and fine structure constant with runaway dilaton
• Radiative corrections and Lorentz violation
• String Theory and non-Riemannian Geometry
• Stability of fundamental couplings: a global analysis
• Cusp in the Symmetry Energy, Speed of Sound in Neutron Stars and Emergent Pseudo-Conformal Symmetry
• Universal accelerating cosmologies from 10d supergravity
• A new analysis of fine-structure constant measurements and modelling errors from quasar absorption lines
• Dilaton and Massive Hadrons in a Conformal Phase
• Kaluza-Klein reduction on a maximally non-Riemannian space is moduli-free
• Cosmology at the top of the ${\alpha }^{\prime }$ tower
• Standard Model as a Double Field Theory
• $\mathbf{O}(D,D)$ completion of the Friedmann equations
• de Sitter Bubbles and the Swampland
• Post-Newtonian Feasibility of the Closed String Massless Sector
• Double Field Theory with matter and the generalized Bergshoeff-de Roo identification
• Stringy Newton Gravity with $H$-flux
• A Bouncing Cosmology from VECROs

Cited by in corpus (1)

• Gravitational Core of Double Field Theory: Lecture Notes