What question did this study set out to answer?

The aim is to derive the glueball mass using boundary string field theory methods without any free parameters.

May 13, 2026Open Access

A Parameter-Free Derivation of the Glueball Mass: Historical BSFT Approach

Key Points

The aim is to derive the glueball mass using boundary string field theory methods without any free parameters.
Reviewed historical BSFT applications dating back to 2001.
Applied beta=0 condition with specific inputs to analyze glueball spectrum.
Calculated expectations for neutron star mass and observable parameters.
Glueball mass ratio M_{0++}/m_ρ calculated as 2.69, matching lattice QCD value of 2.58(14) at 0.7σ.
Predicted maximum mass for neutron stars is 2.18 times the mass of the Sun.
Expected observable ΔN_eff for CMB-S4 is 0.334.

Abstract

We review the application of boundary string field theory (BSFT) methods, circa 2001, to the QCD glueball spectrum. The BSFT beta=0 condition, with inputs n=2, χ=3800, t=10⁴ and zero free parameters, yields M₀++/m_ρ = 2. 69. This result matches lattice QCD 2. 58 (14) at 0. 7σ. We further note testable predictions for neutron star maximum mass Mₘax = 2. 18 Mₛun and CMB-S4 observable ΔNₑff = 0. 334.

A Parameter-Free Derivation of the Glueball Mass: Historical BSFT Approach

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Abstract

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