98 citations · 436 across the 18 of their papers we have counts for
18 papers
Vacuum Polarization Energy of a Nonzero Radius Cosmic String Induced Spacetime
Noah Graham, Herbert Weigel
We calculate the vacuum polarization energy (VPE) of a scalar field in the background of a nonsingular cosmic string in spacetime dimensions. Our calculation expresses the VP…
Renormalized Quantum Stress-Energy Tensor of a Nonzero Radius Cosmic String
Noah Graham
We calculate the effects of quantum fluctuations of a scalar field in the "ballpoint pen" cosmic string geometry. Using the approach to renormalization established previously for t…
Quantum Energy Density of Cosmic Strings with Nonzero Radius
M. Koike, X. Laquidain, N. Graham
Zero-point fluctuations in the background of a cosmic string provide an opportunity to study the effects of topology in quantum field theory. We use a scattering theory approach to…
One-Loop Quantum Stress-Energy Tensor for the Kink and sine-Gordon Solitons
Noah Graham, Herbert Weigel
We compute the renormalized one-loop quantum corrections to the energy density and pressure for solitons in the dimensional scalar sine-Gordon and kin…
Quantum stabilization of a hedgehog type of cosmic string
M. Quandt, N. Graham, H. Weigel
Within a slightly simplified version of the electroweak standard model we investigate the stabilization of cosmic strings by fermion quantum fluctuations. Previous studies of quant…
Isospin Invariance and the Vacuum Polarization Energy of Cosmic Strings
H. Weigel, M. Quandt, N. Graham
We corroborate the previously applied spectral approach to compute the vacuum polarization energy of string configurations in models similar to the standard model of particle physi…
Quantum Stabilization of Cosmic Strings
H. Weigel, M. Quandt, N. Graham
In the standard model, stabilization of a classically unstable cosmic string may occur through the quantum fluctuations of a heavy fermion doublet. We review numerical results from…
Cosmic Strings Stabilized by Fermion Fluctuations
H. Weigel, M. Quandt, N. Graham
We provide a thorough exposition of recent results on the quantum stabilization of cosmic strings. Stabilization occurs through the coupling to a heavy fermion doublet in a reduced…
Vacuum Energies of Non--Abelian String--Configurations in 3+1 Dimensions
H. Weigel, M. Quandt, N. Graham +1
We develop a method to compute the fermion contribution to the vacuum polarization energy of string--like configurations in a non--abelian gauge theory. This calculation has been h…
An Electroweak Oscillon
N. Graham
A recent study demonstrated the existence of oscillons -- extremely long-lived localized configurations that undergo regular oscillations in time -- in spontaneously broken SU(2) g…
Quantum QED Flux Tubes in 2+1 and 3+1 Dimensions
N. Graham, V. Khemani, M. Quandt +2
We compute energies and energy densities of static electromagnetic flux tubes in three and four spacetime dimensions. Our calculation uses scattering data from the potential induce…
Fractional and Integer Charges from Levinson's Theorem
E. Farhi, N. Graham, R. L. Jaffe +1
We compute fractional and integer fermion quantum numbers of static background field configurations using phase shifts and Levinson's theorem. By extending fermionic scattering the…
Heavy Fermion Stabilization of Solitons in 1+1 Dimensions
E. Farhi, N. Graham, R. L. Jaffe +1
We find static solitons stabilized by quantum corrections in a (1+1)-dimensional model with a scalar field chirally coupled to fermions. This model does not support classical solit…
Exact Renormalized One-Loop Quantum Corrections to Energies of Solitonic Field Configurations
N. Graham
We develop a method for computing exact one-loop quantum corrections to the energies of static classical backgrounds in renormalizable quantum field theories. We use a continuum de…
A Heavy Fermion Can Create a Soliton: A 1+1 Dimensional Example
E. Farhi, N. Graham, R. L. Jaffe +1
We show that quantum effects can stabilize a soliton in a model with no soliton at the classical level. The model has a scalar field chirally coupled to a fermion in 1+1 dimensions…
Fermionic One-Loop Corrections to Soliton Energies in 1+1 Dimensions
N. Graham, R. L. Jaffe
We demonstrate an unambiguous and robust method for computing fermionic corrections to the energies of classical background field configurations. We consider the particular case of…
Energy, Central Charge, and the BPS Bound for 1+1 Dimensional Supersymmetric Solitons
N. Graham, R. L. Jaffe
We consider one-loop quantum corrections to soliton energies and central charges in the supersymmetric and sine-Gordon models in 1+1 dimensions. In both models, we unambiguou…
Unambiguous one-loop quantum energies of 1+1 dimensional bosonic field configurations
N. Graham, R. L. Jaffe
We calculate one-loop quantum energies in a renormalizable self-interacting theory in one spatial dimension by summing the zero-point energies of small oscillations around a classi…