Results 21 to 30 of about 96,122 (257)

Exact solutions of the Einstein equations for an infinite slab with a constant energy density

Physics Letters B, 2019
We find exact static solutions of the Einstein equations in the spacetime with plane symmetry, where an infinite slab with finite thickness and homogeneous energy (mass) density is present.
Alexander Yu. Kamenshchik, Tereza Vardanyan   +1 more
doaj   +1 more source

Hydrodynamic dispersion relations at finite coupling

Journal of High Energy Physics, 2021
By using holographic methods, the radii of convergence of the hydrodynamic shear and sound dispersion relations were previously computed in the N $$ \mathcal{N} $$ = 4 supersymmetric Yang-Mills theory at infinite ’t Hooft coupling and infinite number of ...
Sašo Grozdanov, Andrei O. Starinets, Petar Tadić   +2 more
doaj   +1 more source

Prescriptive unitarity for non-planar six-particle amplitudes at two loops

Journal of High Energy Physics, 2019
We extend the applications of prescriptive unitarity beyond the planar limit to provide local, polylogarithmic, integrand-level representations of six-particle MHV scattering amplitudes in both maximally supersymmetric Yang-Mills theory and gravity.
Jacob L. Bourjaily, Enrico Herrmann, Cameron Langer, Andrew J. McLeod, Jaroslav Trnka   +4 more
doaj   +1 more source

Infinite distance networks in field space and charge orbits

Journal of High Energy Physics, 2019
The Swampland Distance Conjecture proposes that approaching infinite distances in field space an infinite tower of states becomes exponentially light. We study this conjecture for the complex structure moduli space of Calabi-Yau manifolds.
Thomas W. Grimm, Chongchuo Li, Eran Palti   +2 more
doaj   +1 more source

Indefinite causal structures for continuous-variable systems

New Journal of Physics, 2016
In all our well-established theories, it is assumed that events are embedded in a global causal structure such that, for every pair of events, the causal order between them is always fixed.
Flaminia Giacomini, Esteban Castro-Ruiz, Časlav Brukner   +2 more
doaj   +1 more source

Formation of Majorana fermions in finite-size graphene strips

SciPost Physics, 2017
We investigate the formation of Majorana fermions in finite-size graphene strips with open boundary conditions in both directions, in the presence of an in-plane magnetic field and in the proximity of a superconducting substrate. We show that for long
Vardan Kaladzhyan, Cristina Bena
doaj   +1 more source

New Isotropic and Anisotropic Sudden Singularities

, 2004
We show the existence of an infinite family of finite-time singularities in isotropically expanding universes which obey the weak, strong, and dominant energy conditions. We show what new type of energy condition is needed to exclude them ab initio.
Abdalla M, Barrow J D, Barrow J D, Barrow J D, Barrow J D, Barrow J D, Barrow J D, Christos G Tsagas, Cotsakis S Klaoudatou I, Curbelo R Gonzalez T Quiros I, Dabrowski M, Dabrowski M Stachowiak T, Ellis G F R, Ellis G F R, Ellis G F R, Gibbons G W, Hao J, John D Barrow, Kofinas G, Lake K, Lukash V, McInnes B, Sahni V, Starobinsky A A, Wu P Yu H, Štefančić H   +25 more
core   +3 more sources

Renormalization of the nonequilibrium dynamics of fermions in a flat FRW universe [PDF]

, 1999
We derive the renormalized equations of motion and the renormalized energy-momentum tensor for fermions coupled to a spatially homogeneous scalar field (inflaton) in a flat FRW geometry.
A. L. Maroto, A. L. Maroto, A. Linde, C. Molina-Paris, Carsten Pätzold, D. Boyanovsky, D. Boyanovsky, D. Boyanovsky, D. Boyanovsky, D. Boyanovsky, D. J. H. Chung, E. W. Kolb, F. Cooper, F. Cooper, G. F. Giudice, G. F. Giudice, G. F. Giudice, J. Baacke, J. Baacke, J. Baacke, J. Baacke, J. Baacke, Jürgen Baacke, L. Kofman, L. Parker, N. D. Birrell, P. B. Greene, P. C. W. Davies, P. Greene, R. Kallosh, S. A. Ramsey, S. G. Mamaev, S. G. Mamaev, S. Habib, S. Tsujikawa, S. Tsujikawa, S. Tsujikawa, T. S. Bunch, T. S. Bunch, Y. Shtanov   +39 more
core   +2 more sources

Fermi edge singularity and finite frequency spectral features in a semi-infinite 1D wire

, 2012
11 ...
Sheikhan, A., Snyman, I.
openaire   +2 more sources

Approximation to Hadamard Derivative via the Finite Part Integral

Entropy, 2018
In 1923, Hadamard encountered a class of integrals with strong singularities when using a particular Green’s function to solve the cylindrical wave equation. He ignored the infinite parts of such integrals after integrating by parts.
Chuntao Yin, Changpin Li, Qinsheng Bi
doaj   +1 more source