@article{ganjoo_delos_2024, title={Simulations of gravitational heating due to early matter domination}, ISSN={["1475-7516"]}, DOI={10.1088/1475-7516/2024/04/015}, abstractNote={Abstract In cosmologies with an early matter-dominated era (EMDE) prior to Big Bang nucleosynthesis, the boosted growth of small-scale matter perturbations during the EMDE leads to microhalo formation long before halos would otherwise begin to form. For a range of models, halos can even form during the EMDE itself. These halos would dissipate at the end of the EMDE, releasing their gravitationally heated dark matter and thereby imprinting a free-streaming cut-off on the matter power spectrum. We conduct the first cosmological N-body simulations of the formation and evaporation of halos during and after an EMDE. We show that in these scenarios, the free-streaming cut-off after the EMDE can be predicted accurately from the linear matter power spectrum. Although the free streaming can erase much of the EMDE-driven boost to density perturbations, we use our findings to show that the (re-)formation of halos after the EMDE nevertheless proceeds before redshift ∼ 1000. Early-forming microhalos are a key observational signature of an EMDE, and our prescription for the impact of gravitational heating will allow studies of the observational status and prospects of EMDE scenarios to cover a much wider range of parameters.}, number={4}, journal={JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS}, author={Ganjoo, Himanish and Delos, M. Sten}, year={2024}, month={Apr} }
 @article{ganjoo_erickcek_lin_mack_2023, title={The effects of relativistic hidden sector particles on the matter power spectrum}, ISSN={["1475-7516"]}, DOI={10.1088/1475-7516/2023/01/004}, abstractNote={Abstract}, number={1}, journal={JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS}, author={Ganjoo, Himanish and Erickcek, Adrienne L. and Lin, Weikang and Mack, Katherine J.}, year={2023}, month={Jan} }