Second-and first-order phase transitions in causal dynamical triangulations

TY - JOUR

T1 - Second-and first-order phase transitions in causal dynamical triangulations

AU - Ambjørn, Jan

AU - Jordan, S.

AU - Loll, R.

AU - Jurkiewicz, J.

PY - 2012/6/20

Y1 - 2012/6/20

N2 - Causal dynamical triangulations (CDT) is a proposal for a theory of quantum gravity, which implements a path-integral quantization of gravity as the continuum limit of a sum over piecewise flat spacetime geometries. We use MonteCarlo simulations to analyze the phase transition lines bordering the physically interesting deSitter phase of the four-dimensional CDT model. Using a range of numerical criteria, we present strong evidence that the so-called A-C transition is first order, while the B-C transition is second order. The presence of a second-order transition may be related to an ultraviolet fixed point of quantum gravity and thus provide the key to probing physics at and possibly beyond the Planck scale.

AB - Causal dynamical triangulations (CDT) is a proposal for a theory of quantum gravity, which implements a path-integral quantization of gravity as the continuum limit of a sum over piecewise flat spacetime geometries. We use MonteCarlo simulations to analyze the phase transition lines bordering the physically interesting deSitter phase of the four-dimensional CDT model. Using a range of numerical criteria, we present strong evidence that the so-called A-C transition is first order, while the B-C transition is second order. The presence of a second-order transition may be related to an ultraviolet fixed point of quantum gravity and thus provide the key to probing physics at and possibly beyond the Planck scale.

U2 - 10.1103/physrevd.85.124044

DO - 10.1103/physrevd.85.124044

M3 - Journal article

SN - 2470-0010

VL - 85

SP - 124044

JO - Physical Review D

JF - Physical Review D

IS - 12

ER -