Unimodular gravity with signature reversal symmetry in a D=2(2n+1)-dimensional bulk resolves the second cosmological constant problem by determining its specific small value.
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Sol` a Peracaula, The cosmological constant prob- lem and running vacuum in the expanding universe, Phil
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In Hu-Sawicki f(R) gravity the redshift-space bispectrum monopole and quadrupole show 2-8% deviations from GR at z=0.7 and k~0.3 h/Mpc with forecasted SNR of 30 and 15 for Euclid.
Modified gravity below O(10) Mpc in a CPL dynamical dark energy background is required to suppress structure growth at low redshifts while satisfying CMB constraints from ISW and lensing.
Bulk viscous fluid models for dark energy yield improved fits to supernova, BAO, and CMB data over LambdaCDM, especially in the interacting non-minimal case.
The running vacuum model derives dynamical vacuum energy from QFT in curved spacetime, using H^4 terms for inflation and H^2 terms for dark energy while G evolves logarithmically.
Unitarity and torsion requirements in (3+1)-dimensional string effective actions introduce only a subleading four-derivative term that leaves the StRVM inflationary dynamics unchanged, confirming the model's phenomenological completeness within string theory.
MCMC constraints on two Lambda(t) models with DESI DR2, CC, and Pantheon+ data yield H0 ~72.5-73 km/s/Mpc, Omega_m0 near standard values in joint fits, and n~0.3 indicating mild deviation from LambdaCDM.
citing papers explorer
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Resolution of the cosmological constant problem by unimodular gravity and signature reversal symmetry
Unimodular gravity with signature reversal symmetry in a D=2(2n+1)-dimensional bulk resolves the second cosmological constant problem by determining its specific small value.
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Running Vacuum in the expanding Universe: a unified QFT paradigm for Inflation and Dark Energy
The running vacuum model derives dynamical vacuum energy from QFT in curved spacetime, using H^4 terms for inflation and H^2 terms for dark energy while G evolves logarithmically.
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The most general four-derivative Unitary String Effective Action with Torsion and Stringy-Running-Vacuum-Model Inflation: Old ideas from a modern perspective
Unitarity and torsion requirements in (3+1)-dimensional string effective actions introduce only a subleading four-derivative term that leaves the StRVM inflationary dynamics unchanged, confirming the model's phenomenological completeness within string theory.
- Spontaneous Symmetry Breaking and the Vacuum Displacement Principle: From Galactic Scales to Cosmic Fine-Tuning