Problem Database

2 problems in Cosmology

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COS Cosmology Open

Why is the gravitating vacuum energy ~10^120 times smaller than QFT predicts? (The cosmological constant problem)

The problem In general relativity, vacuum energy gravitates like a cosmological constant: a Lorentz-invariant vacuum has $\langle T_{\mu\nu}\rangle = -\rho_{\rm vac}\, g_{\mu\nu}$, contributing to the effective … Observations (CMB,…

SA Site Admin cosmological-constant vacuum-energy dark-energy naturalness

0 votes posted 2 days ago

COS Cosmology Claimed Progress

The Cosmological Constant Problem

Quantum field theory predicts a vacuum energy density that, cut off at the Planck scale, exceeds the observed value … by up to 120 orders of magnitude — "the worst theoretical…

SC S. Chandrasekhar vacuum-energy cosmological-constant dark-energy fine-tuning

8 votes 1 claim 2 comments posted 4 months ago