%0 Generic %1 loeb2022selfinteracting %A Loeb, Abraham %D 2022 %K tifr %T Self-Interacting Dark Matter from Gravitational Scattering %U http://arxiv.org/abs/2203.11962 %X I show that gravitational scattering of massive objects provides the cross-section per unit mass required in self-interacting dark matter models that alleviate the small-scale structure problems of cold dark matter. For primordial objects of mass 10^4*(M_4) solar masses, moving at the velocity dispersion characteristic of dwarf galaxies, 10*(v_1) km/s, the cross-section per unit mass for gravitational scattering is 10*M_4/(v_1)^4 cm^2/g. The steep decline in interaction with increasing velocity explains why self-interaction is not evident in data on massive galaxies and clusters of galaxies.

@misc{loeb2022selfinteracting, abstract = {I show that gravitational scattering of massive objects provides the cross-section per unit mass required in self-interacting dark matter models that alleviate the small-scale structure problems of cold dark matter. For primordial objects of mass 10^4*(M_4) solar masses, moving at the velocity dispersion characteristic of dwarf galaxies, 10*(v_1) km/s, the cross-section per unit mass for gravitational scattering is 10*[M_4/(v_1)^4] cm^2/g. The steep decline in interaction with increasing velocity explains why self-interaction is not evident in data on massive galaxies and clusters of galaxies.}, added-at = {2022-03-24T06:28:47.000+0100}, author = {Loeb, Abraham}, biburl = {https://www.bibsonomy.org/bibtex/2ccc25c12391d71e93d4b539934d3b9de/citekhatri}, description = {Self-Interacting Dark Matter from Gravitational Scattering}, interhash = {3b7596029b9366c86b2c32550535d4dd}, intrahash = {ccc25c12391d71e93d4b539934d3b9de}, keywords = {tifr}, note = {cite arxiv:2203.11962Comment: 5 pages, submitted to ApJL}, timestamp = {2022-03-24T06:28:47.000+0100}, title = {Self-Interacting Dark Matter from Gravitational Scattering}, url = {http://arxiv.org/abs/2203.11962}, year = 2022 }