21 citations · 32 across the 7 of their papers we have counts for
8 papers
Effective classical potential for quantum statistical averages
Vijay Ganesh Sadhasivam, Stuart C. Althorpe, Venkat Kapil
We present an effective potential that allows quantum thermal expectation values of a position-dependent observable to be estimated as a classical ensemble average of the correspon…
On the origin of exponential operator growth in Hilbert space
Vijay Ganesh Sadhasivam, Jan M. Rost, Stuart C. Althorpe
The question of thermalization in quantum many-body systems has long been studied through the properties of matrix elements of operators corresponding to local observables. More re…
Parametric tuning of quantum phase transitions in ultracold reactions
Vijay Ganesh Sadhasivam, Fumika Suzuki, Bin Yan +1
Advances in atomic physics have led to the possibility of a coherent transformation between ultra-cold atoms and molecules including between completely bosonic condensates. Such tr…
Nonadiabatic transitions during a passage near a critical point
Nikolai A. Sinitsyn, Vijay Ganesh Sadhasivam, Fumika Suzuki
The passage through a critical point of a many-body quantum system leads to abundant nonadiabatic excitations. Here, we explore a regime, in which the critical point is not crossed…
Thermal quenching of classical and semiclassical scrambling
Vijay Ganesh Sadhasivam, Andrew C. Hunt, Lars Meuser +2
Quantum scrambling often gives rise to short-time exponential growth in out-of-time-ordered correlators (OTOCs). The scrambling rate over an isolated saddle point at finite tempera…
Instantons and the quantum bound to chaos
Vijay Ganesh Sadhasivam, Lars Meuser, David R. Reichman +1
We investigate why the Lyapunov exponents of out-of-time-ordered correlators (OTOCs) satisfy a universal bound by probing imaginary-time path-integral spa…
Stochastic model for barrier crossings and fluctuations in local timescale
Rajeev Bhaskaran, Vijay Ganesh Sadhasivam
The problem of computing the rate of diffusion-aided activated barrier crossings between metastable states is one of broad relevance in physical sciences. The transition path forma…
Testing the quasicentroid molecular dynamics method on gas-phase ammonia
Christopher Haggard, Vijay Ganesh Sadhasivam, George Trenins +1
Quasicentroid molecular dynamics (QCMD) is a path-integral method for approximating nuclear quantum effects in dynamics simulations, which has given promising results for gas- and…