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We apply the massive analogue of the truncated conformal space approach tostudy the two dimensional $\phi^{4}$ theory in finite volume. We focus on thebroken phase and determine the finite size spectrum of the model numerically.We interpret the results in terms of the Bethe-Yang spectrum, from which weextract the infinite volume masses and scattering matrices for variouscouplings. We compare these results against semiclassical analysis andperturbation theory. We also analyze the critical point of the model andconfirm that it is in the Ising universality class.

Truncated Hilbert space approach to the 2d $\phi^{4}$ theory