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Exact distribution of deletion sizes for unavoidable strings

C.E. Heitsch
2001 Proceedings Eighth Symposium on String Processing and Information Retrieval  
We also provide the necessary supporting results, including some useful approximations on the deletion sizes of individual strings.  ...  Bounds such as these on the unique initial reductions of unavoidable strings were instrumental in proving the computational intractability of the reduction algorithm.  ...  Furthermore, the four other known necessary conditions are provably insufficient to decide string unavoidability [5] .  ... 
doi:10.1109/spire.2001.989741 dblp:conf/spire/Heitsch01 fatcat:u23apsa3rbhpnhodpvmn37ktca

Theoretical constraints on brane inflation and cosmic superstring radiation

Rhiannon Gwyn, Mairi Sakellariadou, Spyros Sypsas
2011 Journal of High Energy Physics  
We argue that in a warped background where one might expect axionic radiation to be enhanced relative to gravitational radiation, neithe F-strings nor D-strings can emit axionic radiation, while FD-strings  ...  We analyze theoretical constraints on the consistency of brane inflation leading to cosmic superstring formation and on the subsequent radiation of these cosmic superstrings.  ...  The work of R. G. is also supported by an NSERC Postdoctoral Fellowship.  ... 
doi:10.1007/jhep09(2011)075 fatcat:yvj2fegzwfepxe4i3vypmyvv7a

A root cause analysis and a risk evaluation of PV balance of system failures

Loredana Cristaldi, Mohamed Khalil, Payam Soulatintork
2017 ACTA IMEKO  
This work shows two approaches for a reliability analysis on the subsystem level of aBoS: Failure mode effects criticality analysis (FMECA) and a Markov Process.  ...  Accordingly, further investigations are conducted on a PV inverter to prioritize the maintenance activities by determining the risk priority number of its component failures through quantitative CA.  ...  Figure 2 shows a schematic diagram of optimized BoS that consists of the necessary components needed to be installed on a PV string.  ... 
doi:10.21014/acta_imeko.v6i4.425 fatcat:hr2uti7u25dl7megywerpdb4li

Sound-ranging

Augustus Trowbridge
1920 Journal of the Franklin Institute  
These variations are due largely to an insufficiently accurate knowledge of the weather conditions.  ...  necessary to secure an intersection of two light streams towards two known points on a surveyed base line by the use of relatively small telescopes, while to obtain a location at all comparable in accuracy  ... 
doi:10.1016/s0016-0032(20)91578-8 fatcat:3qzmyb7vgfdepamgikznyznhiy

On the Generality and Convenience of Etypes

W. Michael Petullo, Joseph Suh
2015 2015 IEEE Security and Privacy Workshops  
The Ethos operating system provides a number of features which aid programmers as they craft robust computer programs. One such feature of Ethos is its distributed, mandatory type system-Etypes.  ...  would check the string but not the encoded type).  ...  ACKNOWLEDGMENTS The authors would like to thank all of the researchers who have contributed to Jon Solworth's Ethos project, in particular Wenyuan Fei and Pat Gavlin for their work on Etypes.  ... 
doi:10.1109/spw.2015.16 dblp:conf/sp/PetulloS15 fatcat:kipvvezev5botos66wnuiswbcq

On the spectrum and scattering of W3 strings

H. Lu, C.N. Pope, S. Schrans, X.J. Wang
1993 Nuclear Physics B  
We present a detailed investigation of scattering processes in W_3 string theory.  ...  Finally, we show that by performing a transformation of the quantum fields that involves mixing the ghost fields with one of the matter fields, the structure of the physical states is dramatically simplified  ...  Thus all the known continuous-momentum physical states in the W 3 string satisfy the unitarity conditions (5.5) . In fact they all saturate one or another of the limits in (5.5).  ... 
doi:10.1016/0550-3213(93)90131-8 fatcat:fhmf3u3vzngf3ggrgw2eyklhyu

On the spectrum and scattering of W3 strings [chapter]

H. Lu, C.N. Pope, S. Schrans, X.J. Wang
1995 W-Symmetry  
We present a detailed investigation of scattering processes in W 3 string theory.  ...  Finally, we show that by performing a transformation of the quantum fields that involves mixing the ghost fields with one of the matter fields, the structure of the physical states is dramatically simplified  ...  Thus all the known continuous-momentum physical states in the W 3 string satisfy the unitarity conditions (5.5) . In fact they all saturate one or another of the limits in (5.5).  ... 
doi:10.1142/9789812798244_0036 fatcat:iwf6xw2gjrdknoos2qv6thzqdq

QCD, supersymmetric QCD, lattice QCD and string theory: Synthesis on the horizon?

M.J. Strassler
1999 Nuclear Physics B - Proceedings Supplements  
Supersymmetric gauge theories in four dimensions have taught us many important physics lessons. These can both inform and be informed by future work on the lattice.  ...  I focus on three issues: the properties of supersymmetric Yang-Mills theory and its relation to the non-supersymmetric case; the properties of gauge theories with matter and their relation to real QCD;  ...  The existence of this phase would be a sufficient but not necessary condition for gauge theory-gauge theory duality in the non-supersymmetric context, which could also perhaps be shown in the context of  ... 
doi:10.1016/s0920-5632(99)85012-9 fatcat:72nwqaddfrcl5j6bjeximcmuwm

Charging black Saturn?

Brenda Chng, Robert Mann, Eugen Radu, Cristian Stelea
2008 Journal of High Energy Physics  
By applying our method on the multi-Reissner-Nordstrom solution in four dimensions, we generate the multi-Reissner-Nordstrom solution in five dimensions.  ...  We focus on the five-dimensional solution describing a pair of charged black objects with general masses and electric charges.  ...  Acknowledgements The work of R.B.M. and C.S. was supported by the Natural Sciences and Engineering Research Council of Canada.  ... 
doi:10.1088/1126-6708/2008/12/009 fatcat:6n32jtx4obacdgryxq6fkubx5y

Dirac's equation and the nature of quantum field theory

Arkady Plotnitsky
2012 Physica Scripta  
In this respect, Dirac's task was more similar to that of Schrödinger in his work on his version of quantum mechanics.  ...  This paper re-examines the key aspects of Dirac's derivation of his relativistic equation for the electron in order advance our understanding of the nature of quantum field theory.  ...  necessary algebraic conditions upon ↵ µ and .  ... 
doi:10.1088/0031-8949/2012/t151/014010 fatcat:2nudkbkuwfbfzakcg4lcjqefry

Tachyonic inflation on (non-)Archimedean spaces

Milan Milosevic, Goran Djordjevic
2016 Facta universitatis - series Physics Chemistry and Technology  
We consider quantum propagators of the models, as well as, the vacuum states and conditions necessary to construct an adelic generalization.  ...  In addition we present inflationary scenarios for some interesting models based on analytic and numeric calculations.  ...  The necessary condition for the existence of an adelic model is existence of p-adic quantum-mechanical ground state Ω(|q α | p ), i.e.  ... 
doi:10.2298/fupct1603257m fatcat:likdzr6mwncq7mbpt3p27ib5ou

Bacterial Casing Corrosion in the Ventura Field

KEITH DOIG, A. WACHTER
1951 Corrosion  
The four curves are based respectively on an un- limited number of failures, 100 percent failures, 75 percent failures and 50 percert failures.  ...  inhibitor would have the persistence necessary to insure permanent protec- tion of the casing. 3) It is important that the mechanism of the corro- sion be known in order to select the correct in- hibitor  ... 
doi:10.5006/0010-9312-7.7.212 fatcat:vh2vj4bpjzgi7da3s2hybvffxe

Inflation and String Theory [article]

Daniel Baumann, Liam McAllister
2014 arXiv   pre-print
This material is a portion of a book, also entitled "Inflation and String Theory", to be published by Cambridge University Press.  ...  We review cosmological inflation and its realization in quantum field theory and in string theory.  ...  For a discussion of the necessary conditions on K i in the context of a survey of a class of Calabi-Yau manifolds, see [368] .  ... 
arXiv:1404.2601v1 fatcat:b7crg55bq5ca7mbt75k5z7qso4

PhD Thesis: String theory in the early universe [article]

Rhiannon Gwyn
2009 arXiv   pre-print
The intersection of string theory with cosmology is unavoidable in the early universe, and its exploration may shine light on both fields.  ...  First, we address the longstanding problem of finding a string theory realisation of the axion.  ...  One of its drawbacks was the unavoidable prediction of a massless spin-2 excitation as one of the vibrational modes of the strings.  ... 
arXiv:0911.2782v1 fatcat:expxt4n5gvbnnjxsxai2lqw444

Benacerraf's Dilemma Revisited

Bob Hale, Crispin Wright
2002 European Journal of Philosophy  
So now we have to rescrutinise Parsons' claim that (PA1′-4′) may be intuitively known. The crucial question is: what are the conditions for the existence of types, e.g. of type strings?  ...  same kinds of processes as leading to a grasp of, for instance, 'the four pattern .. the structure common to all collections of four objects'. 25 Obviously this way of 'accessing' structures depends on  ...  So now we have to rescrutinise Parsons' claim that (PA1′-4′) may be intuitively known. The crucial question is: what are the conditions for the existence of types, e.g. of type strings?  ... 
doi:10.1111/1468-0378.00151 fatcat:3suwqdrm5zbpdgmbm22z3j4p3e
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