Quantum-bias cosmology: Acceleration from holographic information capacity

2018/10/31 by Luke M. Butcher · 2 citations
Physics and Astronomy · #Acceleration #Black Holes and Theoretical Physics #Classical mechanics #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Deceleration parameter #Friedmann equations #Friedmann–Lemaître–Robertson–Walker metric #Inflation (cosmology) #Metric expansion of space #Noncommutative and Quantum Gravity Theories #Physics #Planck #Planck length #Planck scale #Quantum #Quantum gravity #Quantum mechanics #Scale factor (cosmology) #Semiclassical physics #Theoretical physics #Universe #astro-ph.CO #gr-qc #hep-th

paper · pdf · doi:10.1103/physrevd.100.063511

published in Physical review. D/Physical review. D. 100(6) (American Physical Society) · 26 pages, 9 figures; improved and extended version with new representation of solns (80), energy-density plot (fig 1), w_eff formula (91), streamlined LCDM comparison, and appendices A and C4

arxiv created 2019/06/14 · openalex publication_date 2019/09/11 · arxiv updated 2019/09/13 · openalex created_date 2019/09/19 · openalex updated_date 2026/08/05

Abstract

I show that a generic quantum phenomenon can drive cosmic acceleration without the need for dark energy or modified gravity. When treating the universe as a quantum system, one typically focuses on the scale factor [of a Friedmann-Robertson-Walker (FRW) spacetime] and ignores many other degrees of freedom. However, the information capacity of the discarded variables will inevitably change as the universe expands, generating quantum bias (QB) in the Friedmann equations. If information could be stored in each Planck volume independently, this effect would give rise to a constant acceleration 10¹²⁰ times larger than that observed, reproducing the usual cosmological constant problem. However, once information capacity is quantified according to the holographic principle, cosmic acceleration is far smaller and depends on the past behavior of the scale factor. I calculate this holographic quantum bias, derive the semiclassical Friedmann equations, and obtain their general solution for a spatially flat universe containing matter and radiation. Comparing these QB-CDM solutions (which include standard cold dark matter) to those of \mathrm\ensuremathΛCDM, the new theory is shown to be falsifiable, but nonetheless consistent with current observations. In general, realistic QB cosmologies undergo phantom acceleration (w_eff<\ensuremath-1) at late times, predicting a big rip in the distant future.

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