Results 41 to 50 of about 4,774 (143)

Strings, gravity and particle physics [PDF]

, 2002
This contribution, aimed mostly at experimental particle physicists, reviews some of the main ideas and results of String Theory in a non-technical language.
Sagnotti, Augusto, Sevrin, Alexander
core   +2 more sources

Explore and Exploit with Heterotic Line Bundle Models

Fortschritte der Physik, Volume 68, Issue 5, May 2020., 2020
Deep reinforcement learning is used to explore a class of heterotic SU(5) GUT models constructed from line bundle sums over Complete Intersection Calabi Yau (CICY) manifolds. Several experiments are performed where A3C agents are trained to search for such models. These agents significantly outperform random exploration, in the most favourable settings
M. Larfors, R. Schneider
wiley   +1 more source

The Nelson‐Seiberg Theorem Generalized with Nonpolynomial Superpotentials

Advances in High Energy Physics, Volume 2020, Issue 1, 2020., 2020
The Nelson‐Seiberg theorem relates R‐symmetries to F‐term supersymmetry breaking and provides a guiding rule for new physics model building beyond the Standard Model. A revision of the theorem gives a necessary and sufficient condition to supersymmetry breaking in models with polynomial superpotentials.
Zhengyi Li, Zheng Sun, Antonio J. Accioly   +2 more
wiley   +1 more source

Product-Group Unification in Type IIB String Thoery [PDF]

, 2004
The product-group unification is a model of unified theories, in which masslessness of the two Higgs doublets and absence of dimension-five proton decay are guaranteed by a symmetry. It is based on SU(5) x U(N) (N=2,3) gauge group.
A. Anisimov, A. Anisimov, A. Hebecker, A. Masiero, A.M. Uranga, B. Stefanski, Jr., C.A. Scrucca, C.G. Callan, D.E. Kaplan, E. Witten, E. Witten, E.G. Gimon, E.G. Gimon, G. Aldazabal, G. Curio, H. Murayama, H. Ooguri, I. Antoniadis, I. Brunner, J. Hisano, J. Michelson, J. Polchinski, J. Polchinski, J. Sato, J.A. Harvey, J.D. Blum, J.F. Morales, J.R. Ellis, J.R. Ellis, J.R. Ellis, K. Becker, K. Eguchi, K. Kurosawa, K.I. Izawa, L.E. Ibanez, L.J. Hall, L.J. Hall, M. Atiyah, M. Bershadsky, M. Dine, M. Endo, M. Fujii, M. Fujii, M. Ibe, M.B. Green, N. Sakai, O. DeWolfe, P. Candelas, P. Langacker, P. Ramond, Q.R. Ahmad, R. Barbieri, R. Blumenhagen, R. Minasian, S. Kachru, S. Kachru, S. Mukai, S. Weinberg, S.B. Giddings, S.M. Barr, T. Friedmann, T. Goto, T. Watari, T. Watari, T. Watari, T. Yanagida, T. Yanagida, Taizan Watari, U. Amaldi, Y. Fukuda, Y. Fukuda, Y. Fukuda, Y. Fukuda, Y. Hayato, Y. Imamura, Y.K. Cheung, Z. Chacko   +76 more
core   +2 more sources

TeV-Scale strings

, 2014
This article discusses the status of string physics where the string tension is around the TeV scale. The article covers model building basics for perturbative strings, based on D-brane configurations. The effective low energy physics description of such
Berenstein, David
core   +1 more source

The Fluxed MSSM [PDF]

, 2004
Recent developemnts in string compactifications in the presence of antisymmetric field backgrounds suggest a new simple and predictive structure for soft terms in the MSSM depending only on two parameters.
Ibanez, Luis E.
core   +2 more sources

LHC SUSY and WIMP dark matter searches confront the string theory landscape

Journal of High Energy Physics, 2019
The string theory landscape of vacua solutions provides physicists with some understanding as to the magnitude of the cosmological constant. Similar reasoning can be applied to the magnitude of the soft SUSY breaking terms in supersymmetric models of ...
Howard Baer, Vernon Barger, Shadman Salam, Hasan Serce, Kuver Sinha   +4 more
doaj   +1 more source

D-Foam Phenomenology: Dark Energy, the Velocity of Light and a Possible D-Void

, 2009
In a D-brane model of space-time foam, there are contributions to the dark energy that depend on the D-brane velocities and on the density of D-particle defects.
Abdo A. A., Ackermann M., Antoniadis I., DIMITRI V. NANOPOULOS, Jacob U., JOHN ELLIS, Lambert N. D., Maccione L., Moeller N., NICK E. MAVROMATOS, Seiberg N.   +10 more
core   +1 more source

LHC and ILC probes of hidden-sector gauge bosons [PDF]

, 2006
Intersecting D-brane theories motivate the existence of exotic U(1) gauge bosons that only interact with the Standard Model through kinetic mixing with hypercharge.
Kumar, Jason, Wells, James D.
core   +2 more sources

An Exceptional Sector for F-theory GUTs

, 2010
D3-branes are often a necessary ingredient in global compactifications of F-theory. In minimal realizations of flavor hierarchies in F-theory GUT models, suitable fluxes are turned on, which in turn attract D3-branes to the Yukawa points.
Cumrun Vafa, Jonathan J. Heckman, S. Katz   +2 more
core   +1 more source