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Yue Zhang (Carleton University)14/11/2022, 12:30
I will discuss dark matter candidates that are thermal relics of the early universe. In the first part of the talk, I will present a roadmap for exploring various theories including the WIMP, dark sectors and more, using the observed relic density as guidance. In the second part, I will focus on a class of thermal relics that decouple relativistically early on and require a dilution mechanism...
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Jacques Pienaar (University of Chicago)14/11/2022, 13:00
The content of the universe is well known from astrophysical observations, from which we conclude that about 27% of the universe consists of cold dark matter. Current theories of what a particle physics candidate for dark matter might behave like, provide several avenues for detection of this missing component of our universe. I will discuss the experimental efforts to detect dark matter...
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Yining You (University of Florida)14/11/2022, 13:45
We explore the possibility of using superfluid helium for direct detection of sub-GeV dark matter (DM). We discuss the relevant phenomenology resulting from the scattering of an incident dark matter particle on a Helium nucleus. Rather than directly exciting quasi-particles, DM in this mass range will interact with a single He atom, triggering an atomic cascade which eventually also includes...
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Haider Alhazmi14/11/2022, 14:00
Dark matter is one of the most interesting fundamental puzzles of our universe. While we have accumulated sufficient cosmological evidence supporting its existence, the character of the dark matter particle is still unknown. A myriad of models have been proposed, the majority of which introduce a single dark matter candidate for simplicity. Though they provide testable hypotheses at various...
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Robert McGehee14/11/2022, 14:15
In the first part of this talk, I will estimate the maximum direct detection cross section for sub-GeV dark matter scattering off nucleons. For dark matter masses in the range of 10 keV − 100 MeV, cross sections greater than $10^{−36} - 10^{−30} \text{cm}^2$ seem implausible. I'll introduce a dark matter candidate which realizes this maximum cross section: HighlY interactive ParticlE Relics...
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Shao-Feng Ge (TDLI-SJTU)14/11/2022, 14:30
Although the dark matter direct detection experiments have advanced a lot to set very stringent bound on the GeV~TeV scale WIMP particles, the sub-GeV window is still open and waiting for further exploration. In addition to inventing new experimental probes, it is of more interest to extend the physics potential of existing direct detection experiments. I will provide two examples of achieving...
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Nirmal Raj (TRIUMF)14/11/2022, 15:30
"Ultraheavy" dark matter candidates with masses between roughly 10 TeV and the Planck scale present a wide and underexplored parameter space, with rich possibilities of models and cosmic histories. Both current detectors and novel search techniques -- direct and indirect -- are poised to hunt ultraheavy particle dark matter in the coming decade. I will present an overview of these with...
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Daniel Gilman14/11/2022, 16:00
The abundance and density profiles of dark matter halos on sub-galactic scales, below $10^9 M_{\odot}$ solar masses, depend on the production mechanism, mass, and interactions of the dark matter particle(s). Galaxy-scale strong gravitational lenses provide the ideal observational platform with which to characterize the properties of low-mass halos because lensing depends only on gravity, and...
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Keir Rogers14/11/2022, 16:15
The fundamental nature of dark matter so far eludes direct detection experiments, but it has left its imprint in the large-scale structure (LSS) of the Universe. Extracting this information requires accurate modelling of structure formation and careful handling of astrophysical uncertainties. I will present new bounds using the LSS on two compelling dark matter scenarios that are otherwise...
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Gowri Kurup (University of Oxford)14/11/2022, 16:30
A compelling solution to the Dark Matter question is that DM particles are part of a “dark sector” with fields uncharged under the SM gauge group. On the other hand, conformal field theories are ubiquitous and appear as fixed points of gauge theories. CFTs are scale-invariant and UV complete. In this work, we consider dark sectors described by conformal field theories and couple to the SM via...
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Daniel Carney (Berkeley National Lab)14/11/2022, 17:00
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Yu-Dai Tsai (University of California, Irvine)14/11/2022, 17:30
We derive purely gravitational constraints on dark matter and cosmic neutrino profiles in the solar system using asteroid (101955) Bennu. We focus on Bennu because of its extensive tracking data and high-fidelity trajectory modeling resulting from the OSIRIS-REx mission. We find that the local density of dark matter is bound by $\rho_{\rm DM} < 3.3\times 10^{-15}\;\rm kg/m^3 \simeq...
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Melissa Joseph14/11/2022, 17:45
Models of dark sectors with a mass threshold can have important cosmological signatures. If, in the era prior to recombination, a relativistic species becomes non-relativistic and is then depopulated in equilibrium, there can be measurable impacts on the CMB as the entropy is transferred to lighter relativistic particles. In particular, if this "step'" occurs near z = 20,000, the model can...
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Dr Chanda Prescod-Weinstein (University of New Hampshire)15/11/2022, 12:20
In this talk, I will describe my efforts to understand the nature of the mysterious dark matter, using the assumption that dark matter is comprised of ultralight axions. From the optical to the X-ray and gamma-ray universe, astrophysics has a role to play in understanding the details of this major problem in particle physics. I will give some insight into how I am using a range of tools to get...
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Andrew Long (Rice University)15/11/2022, 12:50
The detection of gravitational wave radiation by LIGO in 2015 opened a new window onto the cosmos, and we are just now beginning to peer out into the unknown. Since this radiation can propagate unhindered through even an optically-thick medium, gravitational waves will prove to be a powerful probe of the early universe, which currently remains shrouded behind the photon’s surface of last...
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Maya Silverman15/11/2022, 13:20
Self-interacting dark matter is a compelling idea because it could solve the small-scale structure formation problems and it arises generically in new physics models with dark sectors. We explore the properties of Milky Way subhalos in self-interacting dark matter models for moderate cross sections of 1 to 5 cm$^2$/g using high-resolution zoom-in N-body simulations. We include the...
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Matthias Danninger (Simon Fraser University (CA))15/11/2022, 13:50
For the last few decades, High Energy Physics has been a victim of its own early success. Despite numerous theoretical arguments why it cannot be the final explanation for the interactions of fundamental particles, the Standard Model of particle physics continues to withstand intense scrutiny of the most determined experimental physicists. One promising way to search for signs of new physics...
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Sebastian Trojanowski (National Centre for Nuclear Research, Poland)15/11/2022, 14:20
High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe Standard...
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Tobias Boeckh15/11/2022, 14:50
FASER, the ForwArd Search ExpeRiment, is an LHC experiment located 480 m downstream of the ATLAS interaction point, along the beam collision axis. FASER and its sub-detector FASERnu have two physics goals: (1) to detect and study TeV-energy neutrinos, the most energetic neutrinos ever detected from a human-made source, and (2) to search for new light and very weakly-interacting particles....
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Hualin Mei (Univ. of California Santa Barbara (US))15/11/2022, 15:10
We will present the status of the of milliQan Run 3 Detector that has been installed in PX56 at CERN LHC P5. The Run 3 detector is expected to enhance the sensitivity to the search of milli-charged particles [1], comparing to that from the milliQan demonstrator which had been taking data during year 2018 of the LHC Run 2 [2].
[1] Phys. Rev. D 104, 032002
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[2] Phys. Rev. D 102, 032002 -
Thông Nguyễn Trần Quang15/11/2022, 16:35
By measuring the flux of Dark Matter (DM) annihilations from a very long
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distance, Indirect Detection (ID) can be used to investigate Dark Matter (DM) models with very weak couplings and long-lived mediators. And with a large population density and a strong gravitational bound, Neutron Stars (NS) are very effective to collect DM in Galactic Center (GC) to increase DM density, thus enhancing... -
Mudit Rai15/11/2022, 16:50
Abstract is attached as requested.
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Priyank Parashari (Indian Institute of Science)15/11/2022, 17:05
Recently, the Event Horizon Telescope (EHT) has observed the first image of the supermassive black hole
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(Sgr A$^*$) at the center of our own Milky Way galaxy. EHT observations also give some information
about the spin of Sgr A$^*$. They found that the dimensionless spin parameters (a$^*$) 0.5 and 0.94
have passed all their tests. These observations can be used to study the Ultra light... -
Shiuli Chatterjee15/11/2022, 17:20
Neutron stars (NS) of age >109 yrs exhaust thermal and rotational energies and cool down to temperatures below O(100) K. Accretion of particle dark matter (DM) by such NS can heat them up through kinetic and annihilation processes. This increases the NS surface temperature to a maximum of ∼2550 K in the best case scenario. The maximum accretion rate depends on the DM ambient density and...
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Akash Kumar Saha15/11/2022, 17:35
Detection of high-energy diffuse gamma-rays is one of the most important aspects of modern astrophysics. Recently Tibet AS$_\gamma$ collaboration [1] has detected galactic sub-PeV diffuse gamma-rays, which also happens to be the highest energy diffuse gamma-rays detected to date. In this work [2], we show that these high-energy diffuse gamma rays can be an excellent probe for detecting...
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Javier Mauricio Duarte (Univ. of California San Diego (US))16/11/2022, 12:20
Abstract: I will give a high-level overview of recent advances om machine learning for high energy physics, including developments in neural network architectures (e.g., graphs, transformers, and equivariant networks), generative modeling, anomaly detection, and fast inference.
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Debajyoti Sengupta (Universite de Geneve (CH))16/11/2022, 12:50
CURTAINs is a fully data driven technique for creating background templates for use in searches for new physics processes. We employ invertible neural networks to learn the transformation to map any data point from its value of the resonant variable (e.g., invariant mass) to another chosen value. This conditional transformation allows us to create a template in the signal window, by mapping...
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Mohamed Zaazoua (Universite Mohammed V (MA))16/11/2022, 13:05
In this work, the invisible Higgs sector was investigated, where Higgs bosons are produced via the vector boson fusion (VBF) process and subsequently decay into invisible particles. The hypothesis under consideration is that the Higgs boson might decay into a pair of weakly interacting massive particles (WIMPs), which are candidates for dark matter. The observed number of events are found to...
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Xola Mapekula (University of Johannesburg (ZA))16/11/2022, 13:20
This paper presents the search for a new spin-1 boson in a four-lepton final state through the channel $H\rightarrow Z_dZ_d\rightarrow 4l$ where $Z_d$ is the new spin-1 boson, and $4\ell$ could be 4e 4$\mu$ or 2e2$\mu$. This analysis' mass range of the $Z_d$ probed lies between 15 - 60 GeV. We conducted this search using $pp$ collision data from the ATLAS detector corresponding to an...
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Chiara Mingarelli (University of Connecticut)16/11/2022, 13:50
Galaxy mergers are a standard aspect of galaxy formation and evolution, and most (likely all) large galaxies contain supermassive black holes. As part of the merging process, the supermassive black holes should in-spiral together and eventually merge, generating a background of gravitational radiation in the nanohertz to microhertz regime. An array of precisely timed pulsars spread across the...
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LINGFENG LI (Brown U.)16/11/2022, 14:20
The QCD axion cosmology depends crucially on whether the QCD axion is present during inflation or not. We point out that contrary to the standard criterion, the Peccei-Quinn (PQ) symmetry could remain unbroken during inflation, even when the axion decay constant, $f_a$, is (much) above the inflationary Hubble scale, $H_I$. This is achieved through the heavy-lifting of the PQ scalar field due...
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Nicholas DePorzio16/11/2022, 14:35
Cosmological data provide a powerful tool in the search for physics beyond the Standard Model (SM). Light but massive relics (LiMRs) which decoupled from the SM while relativistic contribute to the radiation energy budget, and are commonly searched through variations in the effective number $N_{\rm eff}$ of neutrino species. In addition to this effect, LiMRs with masses on the eV scale (meV-10...
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Asli Abdullahi16/11/2022, 15:35
In this talk, we discuss the unique potential of neutrino experiments to probe a wide range of low-energy new physics models. We review some of the main ways dark sectors have already been studied at neutrino experiments and how we can further probe new physics with next-generation experiments. As a case study, we consider the example of HNLs endowed with hidden sector interactions and how...
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Douglas Tuckler16/11/2022, 16:05
New beyond-the-Standard Model mediators that couple predominantly to neutrinos are not yet probed by existing experimental searches. Such a neutrinophilic mediator is well motivated for addressing the origin of several neutrino-portal dark matter candidates, including thermal freeze-out and sterile-neutrino dark matter scenarios. In this talk, we explore the sensitivity to this scenario from...
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Adrian Thompson16/11/2022, 16:20
Pseudo-Nambu-Goldstone Bosons (pNGBs) are a byproduct of many theories that address long-standing puzzles of the Standard Model (SM). Axions and axion-like particles (ALPs) which have spawned from solutions to the strong-CP problem can also make good dark matter candidates and arise ubiquitously in string theory, and in other theories with spontaneously broken symmetries. ALPs in the MeV mass...
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Carlos A. Argüelles-Delgado (Harvard University)16/11/2022, 16:50
In this presentation, I will review the current status of searches for connections between dark matter and neutrinos. Neutrinos can be a gateway to the dark sector as, e.g., they allow for the tree-level decay or annihilation of dark matter into neutrinos. I will describe the constraints on dark matter annihilation, decay, and scattering to neutrinos. Finally, I will provide an outlook for...
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Tarak Nath Maity (Indian Institute of Science)16/11/2022, 17:20
We will discuss a novel strategy to search for dark matter (DM)-electron scattering. DM interacting with electrons may get captured inside the Sun. These captured DM may annihilate to produce different Standard Models (SM) particles. Neutrinos produced from these SM states can be observed in IceCube and DeepCore. Although there is no excess of neutrinos from the Solar direction, we find that...
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Ankur Verma16/11/2022, 17:35
Compared to other neutrino sources, the huge anti-neutrino fluxes at nuclear reactor based experiments empower us to derive stronger bounds on non-standard interactions of neutrinos with electrons mediated by light scalar/vector mediators. At neutrino energy around $200$~keV reactor anti-neutrino flux is at least an order of magnitude larger compared to the solar flux. The atomic and crystal...
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Simona Murgia (University of California, Irvine)
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