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Theta-stratifications, Theta-reductive stacks, and applications [article]

Daniel Halpern-Leistner
2016 arXiv   pre-print
We discuss methods for analyzing stability in general moduli problems, focusing on the moduli of coherent sheaves on a smooth projective scheme as a toy example.  ...  We describe several applications: a general structure theorem for the derived category of coherent sheaves on an algebraic stack; some results on the topology of moduli stacks; and a "virtual non-abelian  ...  In the context of Example 1.9, one can find classes (See [HL1] ) in H 2 and H 4 such that µ is the normalized Futaki invariant of [D2] .  ... 
arXiv:1608.04797v1 fatcat:renxp7idufdolkaaoaykl5djwi

Frontal-midline theta from the perspective of hippocampal "theta"

Damon J. Mitchell, Neil McNaughton, Danny Flanagan, Ian J. Kirk
2008 Progress in Neurobiology  
based on frequency bands.  ...  Participants were broken into groups based on whether FM-theta was initially present or not in EEG records.  ... 
doi:10.1016/j.pneurobio.2008.09.005 pmid:18824212 fatcat:exhdoec37vdgnmbmrgwnkgzrey

Refinements to Mumford's theta and adelic theta groups [article]

Nathan Grieve
2018 arXiv   pre-print
We also consider adelic theta groups associated to line bundles on X.  ...  We consider theta groups associated to simple semi-homogenous vector bundles of separable type on X. We determine the structure and representation theory of these groups.  ...  To place our results, concerning theta groups, in proper context it is important to emphasize that our results build on work of Mukai, especially [9] , and Mumford, namely [10, §1] .  ... 
arXiv:1312.2970v2 fatcat:2is3hqrzv5hutjxwtqytp5oohi


2009 English Linguistics  
on data from control constructions in English and Japanese that indicate that a controller is θ-marked in the embedded [Spec, C] (precisely, [Spec, Fin]) by a matrix predicate  ...  θ-marking is performed by the general mechanism of feature checking, I will propose that θ-marking takes place via Agree, and provide conceptual and empirical arguments in favor of this view of θ-marking, based  ...  As for Japanese, Ochi (to appear) argues, based on a study of Nominative-Genitive Conversion, that Japanese has obligatory overt object shift.  ... 
doi:10.9793/elsj.26.1_1 fatcat:pmeeo6y7rjhmvdb64eu3dnzdwu


Jude Terkaa TYOH, Mishina Lucy USHUPULE
2020 Zenodo  
The researcher used their intuitive knowledge of Tiv to analyse the theta role assignment in Tiv based on the ThetaTheory, which is a sub-theory under Chomsky's Government/Binding.  ...  This study differs from the previous work because it has harmonised the claimed maleficiary and object thematic roles into the patient thematic role since the target argument in such a context is affected  ...  The selected sentences in Tiv were analysed based on the objectives of the study which were to discover the thematic roles in Tiv sentences using the Theta Theory.  ... 
doi:10.5281/zenodo.5221409 fatcat:mtjsfpsilbf5vm4ecnyknoclm4

The Optimised Theta Method [article]

José Augusto Fioruci, Tiago Ribeiro Pellegrini, Francisco Louzada, Fotios Petropoulos
2015 arXiv   pre-print
In this paper, we propose a generalisation of the Theta method by optimising the selection of the second theta line, based on various validation schemes where the out-of-sample accuracy of the candidate  ...  In this context, the Theta method called researchers attention due its performance in the largest up-to-date forecasting competition, the M3-Competition.  ...  The Theta method The intuitive idea of the Theta method Assimakopoulos & Nikolopoulos (2000) has its basis on the decomposition of the original time series based on their local curvatures.  ... 
arXiv:1503.03529v1 fatcat:tc64g62hnbfjvbrcfnaxxehjii

Learning alters theta amplitude, theta-gamma coupling and neuronal synchronization in inferotemporal cortex

Keith M Kendrick, Yang Zhan, Hanno Fischer, Alister U Nicol, Xuejuan Zhang, Jianfeng Feng
2011 BMC Neuroscience  
We thank Andrew Tate and Andrea Leigh for their help with carrying out behavioral and recording experiments and Dr Anne Segonds-Pichon for professional statistical advice on analysis of the IT data. .  ...  The synchronization index was based on the following.  ...  The size of the network chosen was based on the number of neurons typically recorded by our array electrodes.  ... 
doi:10.1186/1471-2202-12-55 pmid:21658251 pmcid:PMC3123243 fatcat:gfjp4ggocvfbrjjiipy2wjyjve

Theta oscillations promote temporal sequence learning

Jordan Crivelli-Decker, Liang-Tien Hsieh, Alex Clarke, Charan Ranganath
2018 Neurobiology of Learning and Memory  
time on the current trial.  ...  Participants made semantic decisions on each object as they were presented in a continuous stream. For three "Consistent" sequences, the order of the objects was always fixed.  ...  , based on a semantic question (e.g.  ... 
doi:10.1016/j.nlm.2018.05.001 pmid:29753784 fatcat:breuhg273fhkzmutlf3rjdpdlu

Finding the theta-Guarded Region [article]

Domagoj Matijević, Ralf Osbild
2008 arXiv   pre-print
We prove a tight O(n) worst-case bound on the complexity of the theta-region for theta >= pi/2.  ...  Furthermore, the set of all theta-guarded points is called the theta-guarded region, or the theta-region for short. We present several results on this topic.  ...  Our algorithm is based on the Partitioning Theorem [13] and on the computation of an arrangement of circular arcs.  ... 
arXiv:0806.2090v2 fatcat:affwxbcfhvcyjelin4m5atj3m4

The Theta-Gamma Neural Code

John E. Lisman, Ole Jensen
2013 Neuron  
First-in-first-out item replacement in a model of short-term memory based on persistent spiking.  ...  Neural correlates of object-in-place learning in hippocampus and prefrontal cortex. J. Neurosci. 31, 16991-17006. Kim, S.M., Ganguli, S., and Frank, L.M. (2012).  ...  If we use hippocampal theta as a model, the elevated theta state would be the engaged state. But based on the ''alpha rules,'' the lowered theta state would be the engaged state.  ... 
doi:10.1016/j.neuron.2013.03.007 pmid:23522038 pmcid:PMC3648857 fatcat:iivx4zy7f5e5bo6hojkkfnrdva

Theta phase precession beyond the hippocampus

Sushant Malhotra, Robert W.A. Cross, Matthijs A.A. van der Meer
2012 Reviews in the Neurosciences  
preference and context-dependent reinstatement.  ...  At the population level, theta cycles shape repeated, compressed place cell sequences that correspond to coherent paths.  ...  In decoding which context an animal is in based on hippocampal firing patterns alone, no single place cell provides sufficient information.  ... 
doi:10.1515/revneuro-2011-0064 pmid:22718612 fatcat:ls7szzf7arhwjcbj5xvkno2kz4

Delta and Theta Operator Expansions [article]

Alessandro Iraci, Marino Romero
2022 arXiv   pre-print
Even the most special cases of this general Delta and Theta operator expression are significant; we highlight a few of these special cases.  ...  We end by giving an e-positivity conjecture for when t is not specialized, proposing that our objects can also give the elementary basis expansion in the unspecialized symmetric function.  ...  But now the second and the third factor contributing to weight(T ) are exactly j∈Asc(w) #{cells in the same base and on the right of w j } and j l j × #{cells in the same base and on the right of w j }  ... 
arXiv:2203.10342v2 fatcat:jx6pnkkm5zg3xixnfpcknkmm3q

Tangent cones to generalised theta divisors and generic injectivity of the theta map

George H. Hitching, Michael Hoff
2017 Compositio Mathematica  
For $g\geqslant (2r+2)(2r+1)$ , we show how the bundle $E$ can be recovered from the tangent cone to the generalised theta divisor $\unicode[STIX]{x1D6E9}_{E}$ at ${\mathcal{O}}_{C}$ .  ...  We use this to give a constructive proof and a sharpening of Brivio and Verra's theorem that the theta map $\mathit{SU}_{C}(r){\dashrightarrow}|r\unicode[STIX]{x1D6E9}|$ is generically injective for large  ...  Acknowledgements The authors would like to thank Ciro Ciliberto, Peter Newstead, Christian Pauly, Frank-Olaf Schreyer and Edoardo Sernesi for helpful discussions and comments on this work.  ... 
doi:10.1112/s0010437x17007539 fatcat:42rytntjwvgklcydhbgt3ps4z4

Compositions of theta correspondences

Hongyu He
2005 Advances in Mathematics  
We show that under a natural condition on the sizes of the related dual pairs which can be predicted by the orbit method (  ...  Theta correspondence y over R is established by Howe (J. Amer. Math. Soc. 2 (1989) 535). In He (J. Funct.  ...  The description of the wave front set under quantum induction can be predicted based on [23] .  ... 
doi:10.1016/j.aim.2004.01.001 fatcat:lok7om42gjhq3i7xty7pdtxuhi

Theta-problem and the String Swampland [article]

Sergio Cecotti, Cumrun Vafa
2018 arXiv   pre-print
In the context of N=2 supergravity without vector multiplets coupled to hypermultiplets, the coupling constant of graviphoton τ is apriori a free parameter.  ...  However consistency of quantum gravity would explain the frozen values of θ which thus resolves the 'theta-problem' in the context of this hypothetical universe.  ...  For example in the context of type IIB, we can view that τ as the vev of a field corresponding to the smallest eigenvalue of the Laplacian acting on (2, 1) forms on the CY 3-fold.  ... 
arXiv:1808.03483v1 fatcat:72nsmlmgujcufodarm4u5jpnhe
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