  Gravitational-wave astronomy with coalescing binary neutron star sources
requires the availability of gravitational waveforms with tidal effects
accurate up to merger. This article presents an improved version of \TEOBResum,
a nonspinning effective-one-body (EOB) waveform model with enhanced analytical
information in its tidal sector. The tidal potential governing the conservative
dynamics employs resummed expressions based on post-Newtonian (PN) and
gravitational self-force (GSF) information. In particular, we compute a
GSF-resummed expression for the leading-order octupolar gravitoelectric term
and incorporate the leading-order gravitomagnetic term (either in PN-expanded
or GSF-resummed form). The multipolar waveform and fluxes are augmented with
gravitoelectric and magnetic terms recently obtained in PN. The new analytical
information enhances tidal effects toward merger accelerating the coalescence.
We quantify the impact on the gravitational-wave phasing of each physical
effect. The most important contribution is given by the resummed
gravitoelectric octupolar term entering the EOB interaction potential, that can
yield up to 1~rad of dephasing (depending on the NS model) with respect to its
nonresummed version. The model's energetics and the gravitational wave phasing
are validated with eccentricity-reduced and multi-resolution numerical
relativity simulations with different equations of state and mass ratios. We
also present EOB-NR waveform comparisons for higher multipolar modes beyond the
dominant quadrupole one.

General Relativity and Quantum Cosmology