Physics
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URI: http://hdl.handle.net/2144/1009
Physicists at Boston University look to open a window on the universe. An understanding of physics can elucidate everything from how a ball falls to the ground to what the early universe looked like, can shed light on the forces guiding the cosmos and the behavior of subatomic particles. A degree in physics provides the intellectual foundation for applications in engineering, technology, and industry, as well as in training the next generation of scientists at both the high school and university levels.
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Department chair: Andrei Ruckenstein
Campus address: 590 Commonwealth Avenue
Phone: 617-353-2600
Fax: 617-353-9393
Website: buphy.bu.edu
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Fractional and composite excitations of antiferromagnetic quantum spin trimer chains
(Springer Science and Business Media LLC, 2022-12)Using quantum Monte Carlo, exact diagonalization, and perturbation theory, we study the spectrum of the S = 1/2 antiferromagnetic Heisenberg trimer chain by varying the ratio g = J2/J1 of the intertrimer and intratrimer ... -
Temperature dependence of the (π,0) anomaly in the excitation spectrum of the 2D quantum Heisenberg antiferromagnet
(Institute of Physics, 2019)It is well established that in the low-temperature limit, the two-dimensional quantum Heisenberg antiferromagnet on a square lattice (2DQHAFSL) exhibits an anomaly in its spectrum at short-wavelengths on the zone-boundary. ... -
Introduction to lightcone conformal truncation: QFT dynamics from CFT data
(2020-05-27)We both review and augment the lightcone conformal truncation (LCT) method. LCT is a Hamiltonian truncation method for calculating dynamical quantities in QFT in infinite volume. This document is a self-contained, pedagogical ... -
Model-dependence of minimal-twist OPEs in d > 2 holographic CFTs
(Springer Science and Business Media LLC, 2020-11)Following recent work on heavy-light correlators in higher-dimensional conformal field theories (CFTs) with a large central charge CT, we clarify the properties of stress tensor composite primary operators of minimal twist, ... -
Solving the 2D SUSY Gross-Neveu-Yukawa Model with Conformal Truncation
(Springer Verlag (Germany), 2021-01-27)We use Lightcone Conformal Truncation to analyze the RG flow of the two-dimensional supersymmetric Gross-Neveu-Yukawa theory, i.e. the theory of a real scalar superfield with a $\mathbb{Z}_2$-symmetric cubic superpotential. ... -
The most irrational rational theories
(Springer Science and Business Media LLC, 2019-04)We propose a two-parameter family of modular invariant partition functions of two-dimensional conformal field theories (CFTs) holographically dual to pure three-dimensional gravity in anti de Sitter space. Our two parameters ... -
Probing universalities in d > 2 CFTs: from black holes to shockwaves
(Springer Science and Business Media LLC, 2019-11)Gravitational shockwaves are insensitive to higher-curvature corrections in the action. Recent work found that the OPE coefficients of lowest-twist multi-stress-tensor operators, computed holographically in a planar black ... -
Nonperturbative matching between equal-time and lightcone quantization
(Springer Science and Business Media LLC, 2020-10)We investigate the nonperturbative relation between lightcone (LC) and standard equal-time (ET) quantization in the context of λϕ4 theory in d = 2. We discuss the perturbative matching between bare parameters and the failure ... -
The bulk-to-boundary propagator in black hole microstate backgrounds
(Springer Science and Business Media LLC, 2019-06)First-quantized propagation in quantum gravitational AdS3 backgrounds can be exactly reconstructed using CFT2 data and Virasoro symmetry. We develop methods to compute the bulk-to-boundary propagator in a black hole ... -
Universal lowest-twist in CFTs from holography
(Springer Science and Business Media LLC, 2019-08)We probe the conformal block structure of a scalar four-point function in d ≥ 2 conformal field theories by including higher-order derivative terms in a bulk gravitational action. We consider a heavy-light four-point ...
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