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Title: A conformal truncation framework for infinite-volume dynamics

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [2]
  1. Boston Univ., Boston, MA (United States). Dept. of Physics; University of Illinois
  2. Boston Univ., Boston, MA (United States). Dept. of Physics

Here, we present a new framework for studying conformal field theories deformed by one or more relevant operators. The original CFT is described in infinite volume using a basis of states with definite momentum, P, and conformal Casimir, C. The relevant deformation is then considered using lightcone quantization, with the resulting Hamiltonian expressed in terms of this CFT basis. Truncating to states with C ≤ Cmax, one can numerically find the resulting spectrum, as well as other dynamical quantities, such as spectral densities of operators. This method requires the introduction of an appropriate regulator, which can be chosen to preserve the conformal structure of the basis. We check this framework in three dimensions for various perturbative deformations of a free scalar CFT, and for the case of a free O(N) CFT deformed by a mass term and a non-perturbative quartic interaction at large-N. In all cases, the truncation scheme correctly reproduces known analytic results. As a result, we also discuss a general procedure for generating a basis of Casimir eigenstates for a free CFT in any number of dimensions.

Research Organization:
Boston Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
Grant/Contract Number:
SC0010025
OSTI ID:
1358561
Alternate ID(s):
OSTI ID: 22610308
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2016; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Graviton scattering and a sum rule for the c anomaly in 4D CFT journal September 2018
Operator bases, S-matrices, and their partition functions journal October 2017
Lightcone effective Hamiltonians and RG flows journal August 2018
Momentum-space conformal blocks on the light cone text January 2018
Operator bases, $S$-matrices, and their partition functions text January 2017
Momentum-space conformal blocks on the light cone journal October 2018

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