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Several experimental studies have reported thermally activated behavior ofthe mechanical response of solid Helium-4 which does not fit into the model ofthermally activated Frenkel pairs in an ideal crystal. The purpose of thepresent work is to investigate how structural topological defects modify theresponse. Using quantum Monte Carlo Worm Algorithm, we study temperaturedependence of fluctuations of the total number of particles in samples of hcpsolid Helium-4 containing several types of dislocations. Such fluctuations canbe described by the thermal activation law with the activation energy dependentstrongly on the type of the dislocation and the crystal density. The extractedvalues cover a range from about 1K to 20K. It is also found that annihilationof a jog-antijog pair can produce a local region of the solid characterized bythe orthorhombic symmetry. This serendipitous observation suggests that hcpsolid Helium-4 can undergo a displacive phase transition into the orthorhombiccrystal under uniaxial stress of about 10-15%

Thermal and structural properties of topological defects in solid  Helium-4: Strain induced martensitic transformation from hcp to fc  orthorhombic lattice