Ground State and Collective Modes of Bose-Einstein Condensates in Newtonian and MOND-inspired gravitational potentials

TL;DR

This paper investigates the ground state and collective oscillations of Bose-Einstein condensates in Newtonian and MOND-inspired gravitational potentials, revealing distinct scaling laws and size behaviors relevant for quantum simulations of modified gravity.

Contribution

It provides analytical and numerical analysis of condensates in MOND-like potentials, establishing new scaling laws for size and oscillation frequency in the deep-MOND regime.

Findings

Condensate size scales as 3^{1/3} in MOND potential

MOND-bound condensates oscillate at lower frequencies, scaling as 3^{-1/3}

Deep-MOND regime supports bound states only in specific conditions

Abstract

We analytically and numerically study the ground state and collective dynamics of Bose-Einstein condensates in two traps: a Newtonian potential and a logarithmic potential inspired by Modified Newtonian Dynamics (MOND). In the ground state, the MOND potential supports bound states only in the deep-MOND regime, where the condensate becomes significantly larger than its Newtonian counterpart. The size increases with repulsive coupling parameter $\beta$ in both potentials. A clear scaling law of the size with $\beta^{1/3}$ emerges in the MOND case and is confirmed numerically over a wide parameter range, while for the Newtonian potential no simple scaling law exists as the Thomas-Fermi approximation ceases to be valid. For the dynamics, we derive and solve equations for the monopole collective mode. The larger MOND-bound condensate oscillates at a lower frequency, which scales as $\beta^{-1/3}$ in the strong-interaction limit. These scaling laws provide insights for quantum-simulation experiments aiming to probe modified-gravity scenarios with cold atoms.