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Logarithmic Corrections to Kerr Thermodynamics.
Phys Rev Lett
July 2024
Center for the Fundamental Laws of Nature, Harvard University, Cambridge, Massachusetts 02138, USA.
Recent work has shown that loop corrections from massless particles generate 3/2logT_{Hawking} corrections to black hole entropy which dominate the thermodynamics of cold near-extreme charged black holes. Here we adapt this analysis to near-extreme Kerr black holes. Like AdS_{2}×S^{2}, the near-horizon extreme Kerr (NHEK) metric has a family of normalizable zero modes corresponding to reparametrizations of boundary time.
View Article and Find Full Text PDFConstraining Primordial Black Hole Formation from Single-Field Inflation.
Phys Rev Lett
May 2024
Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan.
The most widely studied formation mechanism of a primordial black hole is collapse of large-amplitude perturbation on small scales generated in single-field inflation. In this Letter, we calculate one-loop correction to the large-scale power spectrum in a model with sharp transition of the second slow-roll parameter. We find that models producing an appreciable amount of primordial black holes induce nonperturbative coupling on a large scale probed by cosmic microwave background radiation.
View Article and Find Full Text PDFQED corrections to the correlated relativistic energy: One-photon processes.
J Chem Phys
May 2024
ELTE, Eötvös Loránd University, Institute of Chemistry, Pázmány Péter Sétány 1/A, Budapest H-1117, Hungary.
This work is a collection of initial calculations and formal considerations within the Salpeter-Sucher exact equal-time relativistic quantum electrodynamics framework. The calculations are carried out as preparation for the computation of pair, retardation, and radiative corrections to the relativistic energy of correlated two-spin-1/2-fermion systems. In this work, particular attention is paid to the retardation and the "one-loop" self-energy corrections, which are known to be among the largest corrections to the correlated relativistic energy.
View Article and Find Full Text PDFLarge-N Principal Chiral Model in Arbitrary External Fields.
Phys Rev Lett
April 2024
Nordita, KTH Royal Institute of Technology and Stockholm University, Stockholm, Sweden and Niels Bohr Institute, Copenhagen University, Copenhagen, Denmark.
We report the explicit solution for the vacuum state of the two-dimensional SU(N) principal chiral model at large N for an arbitrary set of chemical potentials and any interaction strength, a unique result of such kind for an asymptotically free quantum field theory. The solution matches one-loop perturbative calculation at weak coupling, and in the opposite strong-coupling regime exhibits an emergent spacial dimension from the continuum limit of the SU(N) Dynkin diagram.
View Article and Find Full Text PDFMeasurement-Induced Phase Transition for Free Fermions above One Dimension.
Phys Rev Lett
March 2024
Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany and Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
A theory of the measurement-induced entanglement phase transition for free-fermion models in d>1 dimensions is developed. The critical point separates a gapless phase with ℓ^{d-1}lnℓ scaling of the second cumulant of the particle number and of the entanglement entropy and an area-law phase with ℓ^{d-1} scaling, where ℓ is a size of the subsystem. The problem is mapped onto an SU(R) replica nonlinear sigma model in d+1 dimensions, with R→1.
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