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Katie Mack (Perimeter Institute), Aaron Vincent (Queen's University)2/26/24, 9:00 AM
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Sarah Shandera (Pennsylvania State University)2/26/24, 9:15 AM
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Leo Kim (Queen's University)2/26/24, 10:00 AM
A dissipative dark sector can result in the formation of compact objects with masses comparable to stars and planets. In this work, we investigate the formation of such compact objects from a subdominant inelastic dark matter model, and study the resulting distributions of these objects. In particular, we consider cooling from dark Bremsstrahlung and a rapid decay process that occurs after...
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Melissa Diamond2/26/24, 10:15 AM
Self interacting dark matter can form halos and compact objects in an early matter dominated era before Big Bang Nucleosynthesis. This talk explores how an asymmetric dark fermion which self interacts via a heavy vector can undergo halo formation in an early matter dominated era. These halos then cool via bremsstrahlung until they either collapse into black holes or fragment into compact...
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Cosmin Ilie (Colgate University)2/26/24, 11:00 AM
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Mr Caleb Gemmell (University of Toronto)2/26/24, 11:45 AM
Atomic dark matter (ADM) is a simple extension to the Standard Model that is motivated by considerations in both particle and astrophysics. ADM can alter structure formation on subgalactic scales due to its ability to dissipate energy through cooling mechanisms, but is also one realisation of a possible complex dark sector. These dark sectors have been previously studied as a solution to the...
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Julian Munoz (The University of Texas at Austin)2/26/24, 1:30 PM
The launch of the James Webb Space Telescope (JWST) has ignited a revolution in our understanding of the early universe. Its exquisite infrared capabilities have allowed observers to find galaxies at higher redshifts than before and to measure their stellar masses. I will describe how we can use these observations to shed light on the nature of dark matter. For the JWST galaxies to form they...
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Andrija Rasovic (University of Toronton)2/26/24, 2:15 PM
We present the νφMTH, a Mirror Twin Higgs (MTH) model realizing asymmetric reheating, baryogenesis and twin-baryogenesis through the out-of-equilibrium decay of a right-handed neutrino without any hard Z2 breaking. The MTH is the simplest Neutral Naturalness solution to the little hierarchy problem and predicts the existence of a twin dark sector related to the Standard Model (SM) by a Z2...
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Cosmin ilie, Julian Munoz (The University of Texas at Austin), Sarah Shandera (Pennsylvania State University)2/26/24, 2:30 PM
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Aaron Vincent (Queen's University)2/27/24, 9:00 AM
Quasars observed at redshifts z∼6−7.5 are powered by supermassive black holes which are too large to have grown from early stellar remnants without efficient super-Eddington accretion. A proposal for alleviating this tension is for dust and metal-free gas clouds to have undergone a process of direct collapse, producing black hole seeds of mass Mseed∼105M⊙ around redshift z∼17. For direct...
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Flip Tanedo (University of California, Riverside)2/27/24, 9:45 AM
We present a simple dark matter model where resonant annihilation can dissociate molecular hydrogen and induce direct collapse black holes in proto-galaxies. In these models, O(10 MeV) dark matter annihilates into electron-positron pairs which, in turn, inverse Compton scatter CMB light to produce a flux of Lyman-Werner radiation. This mechanism could help explain observed supermassive black...
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Wenzer Qin (MIT)2/27/24, 11:00 AM
The first stars are expected to form through molecular-hydrogen (H2) cooling, a channel that is especially sensitive to the thermal and ionization state of gas, and can thus act as a probe of exotic energy injection from decaying or annihilating dark matter (DM). I will discuss using a toy halo model to study the impact of DM-sourced energy injection on the H2 content of the first galaxies,...
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Mr Liqiang Hou (Perimeter Institute & NC State University)2/27/24, 11:45 AM
We will present our study of the interaction of dark matter (DM) annihilation with primordial gas during cosmic dawn, emphasizing its impact on the thermal environment of nearby dark matter halos. Utilizing a semi-analytic model, we analyze DM annihilation across redshifts $z=20 to 40$, uncovering its role in altering baryon history and impeding gas collapse and cooling in mini-halos, which...
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Yitian Sun (Massachusetts Institute of Technology (MIT))2/27/24, 1:30 PM
The 21-cm signal provides a novel avenue to measure the thermal state of the universe during cosmic dawn and reionization, and thus a probe of exotic energy injection such as those from decaying or annihilating dark matter (DM). These DM processes are inherently inhomogeneous: both decay and annihilation are density dependent, and furthermore the fraction of injected energy that is deposited...
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James Taylor (Waterloo Centre for Astrophysics)2/27/24, 2:15 PM
Recent work on the formation of the first dark matter halos suggests they may have had systematically different density profiles, with stronger cusps and higher densities than those predicted at low redshift. I will review recent work on the first generation(s) of dark matter halos, and discuss the implications for dark matter annihilation and structure formation in general.
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James Gurian (Perimeter Institute)2/27/24, 2:30 PM
I describe an analytic, timescale-based model for the formation of the first stars in the center of collapsing primordial gas clouds. Despite its simplicity, the model reproduces the stellar mass scale and its parameter dependences observed in state-of-the-art cosmological zoom-in simulations, while clarifying the essential underlying physics. The model provides an inexpensive tool for...
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Marco Costa2/27/24, 2:45 PM
Cosmology can give insights on the self-interactions of Dark Matter. In this talk we analyze how long range forces acting solely in the Dark Sector imprint on the distribution of galaxies, the so-called Large Scale Structure (LSS).
First we show how BOSS data can complement CMB information and give the strongest constraint on the strength of the self interaction.
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In particular we discuss... -
Aaron Vincent (Queen's University), Flip Tanedo (University of California, Riverside), Wenzer Qin (MIT), Yitian Sun (Massachusetts Institute of Technology (MIT))2/27/24, 4:30 PM
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Rahul Kannan (York University)2/28/24, 9:00 AM
Current and upcoming James Webb Space Telescope (JWST) imaging surveys hold enormous potential for uncovering the faint low-mass galaxy population, which could provide constraints on alternative DM (altDM) models. In this talk I will investigate the impact of altDM models that exhibit small-scale suppression of the matter power spectrum, namely warm dark matter (WDM), fuzzy dark matter (FDM),...
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Boyuan Liu (University of Cambridge)2/28/24, 9:45 AM
Primordial black holes (PBHs) have long been considered a promising candidate or an important component of dark matter (DM). Recent gravitational wave (GW) observations of binary black hole (BH) mergers have triggered renewed interest in PBHs in the stellar-mass (∼ 10 − 100 Msun) and supermassive regimes (∼ 10^7 − 10^11 Msun). Although only a small fraction (≲ 1%) of dark matter in the form of...
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Benjamin Lehmann (Massachusetts Institute of Technology)2/28/24, 11:00 AM
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Dr Keir Rogers (University of Toronto)2/28/24, 11:45 AM
The fundamental nature of dark matter (DM) so far eludes direct detection experiments, but it has left its imprint in the cosmic web. The standard cold DM model is remarkably well tested by cosmic microwave background and low-redshift galaxy surveys, but well-motivated particle candidates like ultra-light axions will leave signatures on small cosmic scales. These signatures are stronger at...
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Mr Himanish Ganjoo (Perimeter Institute for Theoretical Physics)2/28/24, 1:30 PM
The absence of dark matter signals in direct detection experiments and collider searches has prompted interest in models in which dark matter belongs to a hidden sector minimally coupled to the Standard Model. In these scenarios, a long-lived massive particle might come to dominate the energy density of the early universe temporarily, causing an early matter-dominated era (EMDE) prior to the...
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Gonzalo Alonso-Alvarez (University of Toronto)2/28/24, 1:45 PM
Increasing evidence for a stochastic gravitational background is being collected at pulsar timing arrays. The most plausible origin of the signal is the cumulative strain from the mergers of supermassive black holes at the center of galaxies across the history of the universe. I will discuss how the impact of dark matter dynamical friction on the black hole binary evolution can address some of...
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Benjamin Lehmann (Massachusetts Institute of Technology), Boyuan Liu (University of Cambridge), Rahul Kannan (York University)2/28/24, 3:30 PM
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2/28/24, 4:00 PM
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Aaron Vincent (Queen's University), Katie Mack (Perimeter Institute)2/28/24, 4:30 PM
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Dr Joshua Foster (Massachusetts Institute of Technology)
The 21-cm signal provides a novel avenue to measure the thermal state of the universe during cosmic dawn and reionization (redshifts z~5-30), and thus to probe energy injection from decaying or annihilating dark matter. We present a new code, DM21CM, which extends the functionality of 21cmFAST and DarkHistory to accurately model the inherently spatially inhomogeneous processes through which...
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