Sökning: "Symmetry"

Visar resultat 21 - 25 av 314 uppsatser innehållade ordet Symmetry.

1. 21. Integrability of super spin chains in 6D N=(1,0) SCFTs

   Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

   Författare :Zuxian He; [2023]
   Nyckelord :6D SCFTs; integrability; spin chains; representation theory; symmetry; oscillators; Lie algebra;

   Sammanfattning : Superconformal field theories (SCFTs) are an important class of quantum field theories. These SCFTs have been a significant component in exploring and comprehending the fundamental framework of quantum field theories. LÄS MER

3. 22. An alternative explanation for scale-free speed correlations in starling flocks: coarse-graining in time

   Master-uppsats, Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

   Författare :Mate Jagnjic; [2023]
   Nyckelord :scale-free correlations; active matter; starling flocks; coarse-graining;

   Sammanfattning : In a celebrated series of experimental observations, starling flocks have been shown to be characterized by scale-free, long-ranged spatial correlations in their velocity fluctuations. While this is expected for velocity orientation correlations on the basis of simple symmetry-breaking arguments, the same scaling-free behaviour for speed (i.e. LÄS MER

4. 23. Error propagation in nuclear models

   Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Författare :Artis Mucenieks; [2023]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : In this thesis we perform error analysis of a nuclear model based on density-functional theory developed in Lund. The Lund model allows us to perform calculations of nuclear spectra more efficiently by constructing a simple effective Hamiltonian reproducing the quadrupole deformation and pairing interaction strength parameters of a spherical Hartree-Fock reference functional. LÄS MER

5. 24. Tensor rank and support rank in the context of algebraic complexity theory

   Master-uppsats, KTH/Matematik (Avd.)

   Författare :Pelle Andersson; [2023]
   Nyckelord :linear algebra; tensor product; tensor rank; matrix multiplication; complexity; linjär algebra; tensorprodukt; tensorrang; matrismultiplikation; komplexitet;

   Sammanfattning : Starting with the work of Volker Strassen, algorithms for matrix multiplication have been developed which are time complexity-wise more efficient than the standard algorithm from the definition of multiplication. The general method of the developments has been viewing the bilinear mapping that matrix multiplication is as a three-dimensional tensor, where there is an exact correspondence between time complexity of the multiplication algorithm and tensor rank. LÄS MER

7. 25. More efficient training using equivariant neural networks

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen Vi3

   Författare :Karl Bylander; [2023]
   Nyckelord :convolutional neural networks; equivariance; equivariant neural networks; transmission electron microscopy; machine learning;

   Sammanfattning : Convolutional neural networks are equivariant to translations; equivariance to other symmetries, however, is not defined and the class output may vary depending on the input's orientation. To mitigate this, the training data can be augmented at the cost of increased redundancy in the model. LÄS MER