Event Category: 4D Seminar

4D Seminar series:
Monday at 2:30 on campus

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Heavy axions can arise in the context of Grand Unified theories where a confining dark gauge group unifies with the Standard Model (SM) gauge group. Depending on the strength of the axion coupling to the SM, heavy axion lifetimes can vary drastically, requiring very different observational probes. I will discuss two such probes. First, I will show heavy axions with MeV … Read More

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Jae Hyeok ChangAbstract: Finite temperature effects in the Standard Model tend to restore the electroweak symmetry in the early universe, but new fields coupled to the higgs field may as well reverse this tendency, leading to the so-called electroweak symmetry non-restoration (EW SNR) scenario. Previous works on EW SNR often assume that the reversal is due to the thermal fluctuations of … Read More

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abstract: Light scalar fields typically develop spatially varying backgrounds during inflation. Very often they do not directly affect the density perturbations, but interact with other fields that do leave nontrivial signals in primordial perturbations. In this sense they become “missing scalars” at the cosmological collider. We study potentially observable signals of these missing scalars, focusing on a special example where … Read More

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Abstract: Primordial black holes (PBHs) are an exciting prospect for accounting for anywhere from .1 percent to the entirety of the dark matter abundance. In my talk, I will present recent and ongoing work on the production of PBHs from a generic class of inflationary models that incorporate realistic features from high-energy physics—including multiple interacting scalar fields and nonminimal couplings to the … Read More

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Abstract: We study the solar emission of light dark sector particles that self-interact strongly enough to self-thermalize. The resulting outflow behaves like a fluid which accelerates under its own thermal pressure to highly relativistic bulk velocities in the solar system. Compared to the ordinary non-interacting scenario, the local outflow has a much higher number density and correspondingly a much lower … Read More

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I will review the recent results on using quantum algorithms to understand fundamental properties in High Energy Physics. The goal of this work is to allow the calculation of important properties of the Standard Model non-perturbatively and ultimately to simulate scattering at colliders from first principles. I will show that by simulating matrix elements of effective theories one maximizes the … Read More

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Abstract:  “In the non-relativistic limit, scattering of two particles by boson exchange can be described using a static potential, i.e, that of a force between them. The exchange of two fermions can also lead to a force, as if the two fermions behave like an effective boson. These forces are called “quantum forces”, and the range of these forces is … Read More

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In dark sector models involving a new confining force that binds a set of dark quarks into dark hadrons, dark sector quarks could be produced at the LHC, where they undergo a dark parton shower, generating jets of dark hadrons that ultimately decay back to Standard Model hadrons. This yields collider objects that can be nearly indistinguishable from Standard Model … Read More

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The 21-cm cosmological signal is gradually becoming a reality, offering a new insight into previously under-explored epochs. As with other cosmological observations, it is intriguing to consider what 21-cm cosmology can teach us about new physics. To address this, I will provide a concise overview of the physics behind the 21-cm cosmological signal and the effects of various new physics … Read More