Results 31 to 40 of about 2,976,908 (302)

Implementing Unitarity in Perturbation Theory [PDF]

, 2001
Unitarity cannot be perserved order by order in ordinary perturbation theory because the constraint $UU^\dagger=\1$ is nonlinear. However, the corresponding constraint for $K=\ln U$, being $K=-K^\dagger$, is linear so it can be maintained in every order ...
A. B. Migdal, C. S. Lam, C. S. Lam, C. S. Lam, C. S. Lam, E. Witten, F. Bloch, G. ’t Hooft, H. Cheng, H. Cheng, H. Cheng, H. D. Dahmen, I. M. Dremin, J. J. Sakurai, L. D. Landau, L. D. Landau, M. Ciafaloni, M. Levy, P. Kulish, R. Baier, R. Blankenbecler, R. Dib, R. Torgerson, S. Catani, S. Catani, S. Coleman, W. Magnus, Y. J. Feng, Y. J. Feng   +28 more
core   +3 more sources

Effective range expansion revisited

Physics Letters B, 1982
Abstract For small values of the scattering length a (| a | ∼ 0) the effective range function k cot δ shows a pole for small k 2 . The usual effective range expansion cannot produce such a pole. We provide an alternative expansion which reduces to the usual one for | a | ⪢ 0 and shows a pole for | a | ∼ 0. The present expansion explains the
Sadhan K. Adhikari, JoséR.A. Torreão
openaire   +1 more source

Local Adaptation Interacts with Expansion Load during Range Expansion: Maladaptation Reduces Expansion Load [PDF]

The American Naturalist, 2017
The biotic and abiotic factors that facilitate or hinder species range expansions are many and complex. We examine the impact of two genetic processes and their interaction on fitness at expanding range edges: local maladaptation resulting from the presence of an environmental gradient and expansion load resulting from increased genetic drift at the ...
Gilbert, Kimberly J, Sharp, Nathaniel P, Angert, Amy L, Conte, Gina L, Draghi, Jeremy A, Guillaume, Frédéric, Hargreaves, Anna L, Matthey-Doret, Remi, Whitlock, Michael C   +8 more
openaire   +4 more sources

Causality and the effective range expansion

, 2010
We derive the generalization of Wigner's causality bounds and Bethe's integral formula for the effective range parameter to arbitrary dimension and arbitrary angular momentum.
Abel, Arndt, Avery, Barford, Barford, Bedaque, Bedaque, Bertulani, Bethe, Blume, Bolle, Braaten, Chevy, Dean Lee, Efimov, Epelbaum, Flambaum, Fukuda, Gaebler, Gao, Gao, Gao, Giorgini, Gubbels, Gurarie, H.-W. Hammer, Hammer, Hammer, Hammer, Hanna, Higa, Jona-Lasinio, Koehler, Lee, Lee, Levinsen, Madsen, Moroz, Nollett, Ohashi, Okubo, Pavon Valderrama, Phillips, Regal, Scaldeferri, Schunck, Ticknor, von Stecher, Wigner, Zhang   +49 more
core   +1 more source

The Mediterranean-Pontian Argiope bruennichi (Scopoli, 1772) in Poland – overview of traits favouring range expansion

European Journal of Ecology
Due to climate warming the distribution of Southern European species has extended to the north in recent years. Currently, Argiope bruennichi (Scopoli, 1772) is distributed over the whole territory of Poland.
Aldona Dobrzycka-Krahel
doaj   +1 more source

Impacts of Climate Change on Densities of the Urchin Centrostephanus rodgersii Vary among Marine Regions in Eastern Australia

Diversity, 2023
The urchin Centrostephanus rodgersii is expanding its range southward in eastern Australia, which has been associated with negative ecological impacts, including shifts from kelp forests to barrens.
Tom R. Davis, Nathan A. Knott, Curtis Champion, Rachel Przeslawski   +3 more
doaj   +1 more source

Universality of Long-Range Correlations in Expansion-Randomization Systems

, 2005
We study the stochastic dynamics of sequences evolving by single site mutations, segmental duplications, deletions, and random insertions. These processes are relevant for the evolution of genomic DNA.
Graur D, Karlin S, Li W, Li W, M Lässig, P F Arndt, P W Messer, Press W H   +7 more
core   +1 more source

The short range expansion

Advances in Applied Mathematics, 1983
It is shown that the Schrödinger Hamiltonian \(H_{\epsilon}=-\Delta +\epsilon^{-2}\sum^{n}_{j=1}\lambda_ j(\epsilon)V_ j((1/\epsilon)(.-x_ j))\quad on\quad L^ 2({\mathbb{R}}^ 3),\) where \(\lambda_ j\) is analytic, \(\lambda_ j(0)=1\), \(V_ j\) satisfies \((1+|\cdot |)^ 2V_ j\in R\cap L^ 1({\mathbb{R}}^ 3)\) (R being the Rollnik class), converges in ...
Holden, Helge, Krohn, Raphael Høegh, Johannesen, Steinar   +2 more
openaire   +1 more source

Effective-range-expansion study of near threshold heavy-flavor resonances

, 2019
In this work we study the resonances near the thresholds of the open heavy-flavor hadrons using the effective-range-expansion method. The unitarity, analyticity and compositeness coefficient are also taken into account in our theoretical formalism.
Gao, Rui, Guo, Zhi-Hui, Kang, Xian-Wei, Oller, J. A.   +3 more
core   +1 more source

Russian wheat aphids (Diuraphis noxia) in China: Native range expansion or recent introduction? [PDF]

, 2012
In this study, we explore the population genetics of the Russian wheat aphid (RWA) (Diuraphis noxia), one of the world’s most invasive agricultural pests, in north-western China.
Abbot, An, Arnaud-Haond, Basky, Belkhir, Bellwood, Bilgin, Bonizzoni, Bright, Burd, Chapuis, Charaabi, Clement, Clua, Cornuet, Cornuet, Delmotte, Diamond, DiLeo, Dixon, Dolatti, Du, Evanno, Excoffier, Ferrari, Fu, Fu, Goodisman, Haley, Harrison, Jimoh, Jyoti, Kiriac, Kovalev, Li, Liang, Librado, Liu, Llewellyn, Loxdale, Marshall, Martinez-Torres, Michel, Motro, Papadopoulou, Peccoud, Piry, Pritchard, Puterka, Pysek, Ramos-Onsins, Raymond, Reich, Reich, Rice, Richerson, Roderick, Rosenberg, Ross, Ross, Ross, Rousset, Scott, Shufran, Shufran, Shufran, Simon, Simon, Simon, Smith, Stary, Sunnucks, Sunnucks, Tajima, Tamura, Thornton, Van Oosterhout, Venette, Vorburger, Weir, Wilson, Wilson, Wilson, Zhang, Zhang, Zhang   +85 more
core   +3 more sources