552 citations · 7.1k across the 101 of their papers we have counts for
102 papers
Midisuperspacetime foam and the cosmological constant
Steven Carlip
Standard quantum field theory arguments predict an enormous cosmological constant. But what would this mean observationally? For a homogeneous universe the answer is clear, but if…
Causal Sets and an Emerging Continuum
Steven Carlip
Causal set theory offers a simple and elegant picture of discrete physics. But the vast majority of causal sets look nothing at all like continuum spacetimes, and must be excluded…
Covariant canonical quantization and the problem of time
S. Carlip, Weixuan Hu
In the covariant canonical approach to classical physics, each point in phase space represents an entire classical trajectory. Initial data at a fixed time serve as coordinates for…
Quantum Gravity in 2+1 Dimensions
S. Carlip
General relativity becomes vastly simpler in three spacetime dimensions: all vacuum solutions have constant curvature, and the moduli space of solutions can be almost completely ch…
The Einstein-Hilbert Action for Entropically Dominant Causal Sets
Peter Carlip, Steve Carlip, Sumati Surya
In the path integral formulation of causal set quantum gravity, the quantum partition function is a phase-weighted sum over locally finite partially ordered sets, which are viewed…
Spacetime foam: a review
S. Carlip
More than 65 years ago, John Wheeler suggested that quantum uncertainties of the metric would be of order one at the Planck scale, leading to large fluctuations in spacetime geomet…