
	Where results make sense

Topic: Heterotic

In the News (Sat 26 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	String theory - Wikipedia, the free encyclopedia
		The thinking was that out of these five candidate theories, only one was the actual correct theory of everything, and that theory was the theory whose low energy limit, with ten dimensions spacetime compactified down to four, matched the physics observed in our world today.
		That means if we take type IIA and Type IIB theory and compactify them both on a circle (one with a large radius and the other with a small radius) then switching the momentum and winding modes, and switching the distance scale, changes one theory into the other.
		Superstring theories related by S-duality are: type I superstring theory with heterotic SO(32) superstring theory, and type IIB theory with itself.
	en.wikipedia.org /wiki/String_theory (6278 words)

	Luboš Motl's reference frame: Heterotic MSSM
		Heterotic string theory has the other E_8 which is treated very differently.
		You may then wrap a heterotic fivebrane on this two-cycle to cancel the second Chern classes of the two E_8 bundles.
		I actually think that it is very healthy if some of these couplings remain zero at the stringy tree level (in the classical heterotic free fermionic models, only the top quark received a mass at the tree level), but they will have to study this issue later.
	motls.blogspot.com /2005/10/heterotic-mssm.html (2724 words)

	[No title]
		However, the string-string duality conjecture in six dimensions states that the strongly coupled limit of a Heterotic string theory in six-dimensions on a four-torus is equivalent to a weakly coupled Type II string theory in six-dimensions on K3.
		Similarly, it states that the strongly coupled limit of a Type II theory in six dimensions on K3 is equivalent to a weakly coupled Heterotic string theory in six-dimensions on a four-torus.
		Similarly, as a strongly coupled E8 x E8 Heterotic string theory in ten-dimensions is equivalent to the low energy limit of M-Theory on a "large" S^1/Z_2, the low energy limit of M-Theory on S^1/Z_2 x T^4 should be equivalent to a weakly coupled Type II string theory on K3.
	math.ucr.edu /home/baez/twf_ascii/week72 (1884 words)

	M-theory - Wikipedia, the free encyclopedia
		The Type I string theory is related to the heterotic SO(32) theory by S-duality; this means that the Type I description of weakly interacting particles can also be seen as the heterotic SO(32) description of very strongly interacting particles.
		At this point, there are only two string theories: the heterotic string theory (which is also the type I string theory) and the type II theory.
		Taking seriously the notion that all of the different string theories should be different limits and/or different presentations of the same underlying theory, the concept of string theory must be expanded.
	en.wikipedia.org /wiki/M-Theory (2463 words)

	Genetic Distance Based on Simple Sequence Repeats and Heterosis in Tropical Maize Populations -- Reif et al. 43 (4): ...
		Heterotic Group A (Pop21, Pop22, and Pool24), Heterotic Group B (Pop25, Pop32), and populations not yet assigned to heterotic groups (Pop29, Pop43) are shown.
		Heterotic Group A (Pop21, Pop22, and Pool24, open squares), Heterotic Group B (Pop25, filled triangles; Pop32, open triangles), and populations not yet assigned to heterotic groups (Pop29, open diamonds; Pop43, filled diamonds) are shown.
		Intrapool crosses within Heterotic Group A (filled squares) and Group B (filled triangles), interpool crosses between A and B (*), and miscellaneous (open diamonds) are shown.
	crop.scijournals.org /cgi/content/full/43/4/1275 (3859 words)

	Heterotic Nostalgia \| Musings
		It made me feel old because most of the audience were far too young (having been in elementary school at the time) to be familiar with the heterotic version of the story.
		One of the great successes of the heterotic story was that one obtains the “successful” predictions of SU(5) SUSY GUTS (e.
		The vertex operators for quarks and leptons in a single “generation” are constructed using distinct chiral primaries of the internal SCFT.
	golem.ph.utexas.edu /~distler/blog/archives/000092.html (391 words)

	Material and Methods
		A heterotic group is a population of genotypes that, when crossed with individuals from another heterotic group or population, consistently outperform intra-population crosses (Hallauer et al., 1988).
		If heterotic groups can be identified, this would suggest developing the heterotic populations separately and only combining populations when producing a semi-hybrid synthetic cultivar (Brummer, 1999).
		The mean additive performance of the population is given by the average GCA score for the population.
	www.naaic.org /TAG/TAGpapers/riday/riday.html (2419 words)

	Instructional Program: Titles and Abstracts — Department of Theoretical Physics, RSPSE
		The conjectured heterotic -- type IIA duality is a prominent example of this phenomenon, which together with its "decompactification limit", the heterotic -- F-theory duality, leads to a number of surprising mathematical predictions.
		Roughly speaking, heterotic string theories are associated to the geometric data that specify a compactification space, namely a Calabi-Yau manifold viewed as a real manifold, and a semistable bundle on it.
		Notably, for certain heterotic theories we have a so--called anomaly cancellation condition which has a beautiful classical mathematical description in terms of the vanishing of the first Chern class associated to an appropriate index bundle.
	tpsrv.anu.edu.au /Members/bouwknegt/MOST06abs (630 words)

	ARS \| Publication request: Potential Heterotic Crosses in Hops (Humulus Lupulus L.) As Estimated by Aflp-Based Genetic ...
		Citation: Henning, J.A., Townsend, M.S., Kenny, S. Potential heterotic crosses in hops (humulus lupulus l.) as estimated by aflp-based genetic diversity and coefficient of coancestry.
		Interpretive Summary: As in other species, use of widely divergent parents in Hop (Humulus lupulus L.) hybrid crosses should result in offspring heterosis or expression of traits in the offspring that exceed that of the parents.
		Nineteen cultivars were analyzed for genetic distance (GD) to 82 male accessions representing the genetic diversity of the USDA Hop germplasm.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=159763 (321 words)

	SUPERSTRINGS! Supersymmetric Strings
		It may seem to be a problem to have 10 spacetime dimensions instead of the 4 spacetime dimensions that we observe, but we will see that in getting from 10 to 4 we actually find some interesting physics.
		This theory is identical to the SO(32) Heterotic string, except that the gauge group is E8 X E8 which is the only other gauge group allowed by anomaly cancellation.
		It is worthwhile to note that the E8 x E8 Heterotic string has historically been considered to be the most promising string theory for describing the physics beyond the Standard Model.
	www.sukidog.com /jpierre/strings/susy.htm (695 words)

	Vector bundle moduli, small instanton transitions and nonperturbative superpotentials in heterotic M-theory
		We present a method for explicitly computing the non-perturbative superpotentials associated with the vector bundle moduli in heterotic superstrings and M-theory.
		The non-perturbative superpotential generated by a heterotic superstring wrapped around a genus-zero holomorphic curve is proportional to the Pfaffian involving the determinant of a Dirac operator on this curve.
		We show that the space of zero modes of this Dirac operator is the kernel of a linear mapping that is dependent on the associated vector bundle moduli.
	repository.upenn.edu /dissertations/AAI3095862 (270 words)

	Luboš Motl's reference frame: May 2005 (Site not responding. Last check: 2007-10-31)
		The resulting alternative temperature is universal for all string (heterotic and type II) theories, unlike the conventional Hagedorn temperature where the temperatures differ by factors such as "2" or "2-sqrt(2)".
		Note that in the string-string duality, the heterotic string is a NS5-brane of type IIA wrapped on the K3 (and vice versa, the fundamental IIA string is the heterotic fivebrane wrapped on T4).
		The wrapping number of the D4-brane on the K3 is the winding number of the heterotic string and the momentum of the heterotic string becomes the number of extra D0-branes that you must add.
	www.physics.harvard.edu /~motl/2005_05_01_motls_archive.html (13298 words)

	Volker's Publications
		Using this formalism, the number of moduli in both the observable and strongly coupled hidden sectors is explicitly calculated.
		All mathematical details are explained in a pedagogical way, providing the technical framework for constructing heterotic standard model vacua.
		heterotic superstring compactified on a smooth Calabi-Yau threefold with an SU(4) gauge instanton, we show the existence of simple, realistic N=1 supersymmetric vacua that are compatible with low energy particle physics.
	www.sas.upenn.edu /~vbraun/pub (1601 words)

	SUPERSTRINGS! String Duality (Site not responding. Last check: 2007-10-31)
		The Type IIA and Type IIB superstring theories are related by T-duality and the SO(32) Heterotic and E8 x E8 Heterotic theories are also related by T-duality.
		These means that the strong coupling limit of the SO(32) Heterotic string is the weakly coupled Type I string and visa versa.
		This D-string carries the same light fields as the worldsheet of the SO(32) Heterotic string, so when the Type I theory is very strongly coupled this D-string is becomes very light and we see the weakly coupled Heterotic string description emerging.
	www.sukidog.com /jpierre/strings/duality.htm (423 words)

	SUPERSTRING THEORY
		E8xE8 Heterotic Strings: Contains only closed strings, has supersymmetry between forces and matter,and heterotic (strings moving in one direction have a supersymmetry; strings moving in the opposite direction have no supersymmetry).
		SO(32) Heterotic Strings: Same as E8xE8 Heterotic strings, except the gauge symmetry (the ability of various fields to transform into the others) is different.
		Type I and SO(32) Heterotic are S-Dual; Type IIB is S-Dual with itself.
	www.angelfire.com /il/theoreticalphysics/sstheory.html (1321 words)

	heterotic e-string theory concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-31)
		heterotic e-string theory concept from the Astronomy knowledge base
		abstraction > hypothesis > theory > unified theory > string theory > superstring theory > heterotic string theory > heterotic e-string theory
		Next heterotic string theory: heterotic o-string theory Up: heterotic string theory
	www.site.uottawa.ca:4321 /astronomy/heterotice-stringtheory.html (97 words)

	Creeping Up on the MSSM \| Musings
		In perturbative heterotic string theory and, I think, in heterotic M-theory as well, supersymmetry-breaking is generally expected to occur in a hidden sector, associated to the second
		There are such fields in the heterotic string but their masses are string-scale in the weakly-coupled heterotic string and super-Planckian in heterotic M-theory.
		In the dual F-theory picture (these models all have F-theory duals), SUSY is broken on a stack of D3-branes probing a singularity corresponding to a shrunken del Pezzo.
	golem.ph.utexas.edu /~distler/blog/archives/000707.html (940 words)

	Heterotic Relationships among Nine Temperate and Subtropical Maize Populations -- Mickelson et al. 41 (4): 1012 -- Crop ...
		Heterotic Relationships among Nine Temperate and Subtropical Maize Populations -- Mickelson et al.
		Heterotic Relationships among Nine Temperate and Subtropical Maize Populations
		A specific objective of this study was to assess heterotic relationships
	crop.scijournals.org /cgi/content/full/41/4/1012 (4469 words)

	Wrapping the M Theory Five-Brane on K3 (ResearchIndex) (Site not responding. Last check: 2007-10-31)
		Abstract: Using a recently constructed M5-brane world-volume action, we demonstrate that wrapping the M5-brane on K3 gives the heterotic string in seven dimensions.
		To facilitate the comparison, a new version of the world-sheet action for the Naraincompactified heterotic string, with manifest T duality invariance, is formulated.
		0.6: On The Duality Between The Heterotic String And..
	citeseer.ifi.unizh.ch /2888.html (346 words)

	"Warm" Fusion in Chicken Soup [rec.humor.funny]
		As is well known, the principal obstacle to deuteron fusion is the Coulombic potential barrier induced by the electrostatic repulsion of the positively charged particles.
		A straightforward application of ten-dimensional heterotic superstring dynamics shows that deuterons can percolate through the Coulomb barrier through the spontaneous generation of quantum wormholes.
		One can easily see why this process is enhanced in the presence of suspended avian lipids by applying the Anthropic Principle.
	www.netfunny.com /rhf/jokes/91q1/warmfus.html (901 words)

	ARS \| Publication request: Heterotic Effects of Wheat-Rye Chromosomal Translocations on Agronomic Traits of Hybrid ...
		The objective of this study was to evaluate the heterotic effects of T1BL 1RS+T1AL 1RS, T1BL 1RS, and T1AL 1RS on yield and yield components of hybrid wheat grown under adequate moisture regimes.
		The presence of T1AL 1RS resulted in 10.37% heterotic advantage for yield due to increased biomass, KW, and spike density.
		When the two wheat-rye translocated chromosomes are present in the same hybrid, T1AL 1RS seems to have a positive effect on yield through spike density and HI, but masks the effects of T1BL 1RS for some agronomic traits.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=146200 (464 words)

	CiteULike: A Heterotic Standard Model (Site not responding. Last check: 2007-10-31)
		Within the context of the E_8 x E_8 heterotic superstring compactified on a smooth Calabi-Yau threefold with an SU(4) gauge instanton, we show the existence of simple, realistic N=1 supersymmetric vacua that are compatible with low energy particle physics.
		@misc{citeulike:94616, abstract = {Within the context of the E_8 x E_8 heterotic superstring compactified on a smooth Calabi-Yau threefold with an SU(4) gauge instanton, we show the existence of simple, realistic N=1 supersymmetric vacua that are compatible with low energy particle physics.
		The minimal nature and rarity of these vacua suggest the possible theoretical and experimental relevance of spontaneously broken U(1)_{B-L} gauge symmetry and two Higgs-Higgs conjugate pairs.
	www.citeulike.org /article/94616 (414 words)

	R^4 Corrections and Flux Superpotential in Heterotic M-theory (Site not responding. Last check: 2007-10-31)
		I will describe two kinds of corrections to the previously known effective action of heterotic M-theory.
		It is essential to consider SU(3), not G_2, structure on the internal 7d manifold.
		Finally, I will address the issue of how these corrections affect the existence of dS vacua in heterotic M-theory, which were originally found by balancing open membrane instanton effects and gaugino condensation.
	www.physics.unc.edu /string/abs_20060216.html (122 words)

	Compactification, Geometry and Duality: N=2
		We review the geometry of the moduli space of N=2 theories in four dimensions from the point of view of superstring compactification.
		The cases of a type IIA or type IIB string compactified on a Calabi-Yau threefold and the heterotic string compactified on K3xT2 are each considered in detail.
		[117] P. Aspinwall and M. Plesser, Heterotic String Corrections from the Dual Type II String, hep-th/9910248.
	opcit.eprints.org /talks/dner-synthesis/OAI-script.xml (2352 words)

	Luboš Motl's reference frame: Heterotic Standard Model (Site not responding. Last check: 2007-10-31)
		The authors have made an extensive search for a conventional Standard Model obtained from the heterotic strings on a Calabi-Yau manifold, and they claim that they have virtually found a unique solution.
		They argue that their model is the first pure Standard Model obtained from string theory - and I am sure that Christos Kokorelis with his intersecting brane models would disagree.
		OK, so this is a nice smooth Calabi-Yau space and one can use it both in weakly coupled as well as strongly coupled (Horava-Witten) heterotic strings.
	motls.blogspot.com /2005/01/heterotic-standard-model.html (1126 words)

	Bridge Seminars: Axel Krause (Site not responding. Last check: 2007-10-31)
		The talk will focus on explaining to non-string theorists what the strongly coupled heterotic string theory is and what its phenomenological virtues are.
		H.P. Nilles: "On the Low-Energy Limit of String and M-Theory", hep-ph/0004064 (this covers the strongly coupled heterotic string in its second half.)
		Curio, A. Krause: "Enlarging the Parameter Space of Heterotic M-Theory Flux Compactifications to Phenomenological Viability", hep-th/0308202.
	www.physics.umd.edu /ep/informal_seminars/10_31Krause.html (142 words)

	String theorist, heterotic string and KITP. - WordReference Forums
		I was reading a text and I can't find the answers to my questions, so I hope somebody can help me here:
		I need to know the meaning of ''string theorist'' (well it's a profession but I'm not sure about the meaning), and ''heterotic string'' (this is a discovery).
		I also wanna know the meaning of the abbreviation ''KITP''.
	forum.wordreference.com /showthread.php?t=3308 (228 words)

	String Papers
		99: Non-perturbative vacua in heterotic M-theory -- Donagi, Ovrut, Pantev, and Waldram: 8p
		95: Heterotic and type I string dynamics from eleven dimensions -- Horava, Witten: 500+, 26p
		96: On the Duality between the Heterotic String and F-Theory in 8 Dimensions -- Cardoso et al: 15+, 10p
	www.math.harvard.edu /~sarah/strings/papers.html (3619 words)

Try your search on: Qwika (all wikis)