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Matthew Baldwin07/11/2026, 08:53
Parity symmetry, with an extended gauge group $SU(3)_c\times SU(2)_L\times SU(2)_R\times U(1)_X$, can solve the strong CP problem. In particular, models where $SU(2)_R\times U(1)_X\rightarrow U(1)_Y$ is broken by the Parity partner of the SM Higgs solves the strong CP problem without introducing extra symmetry. We discuss the possibility of accidentally stable dark matter in this framework and...
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Christopher Jungkind (University of Notre Dame)07/11/2026, 09:05
A first-order phase transition (FOPT) remains a possible source of the stochastic gravitational-wave (GW) background observed by pulsar timing arrays (PTAs). Can independent observations help test this interpretation? In this talk, I will show that an FOPT capable of generating the observed GW background also produces enhanced curvature perturbations over a narrow range of scales, leading to...
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Brian Zhang07/11/2026, 09:171
The early appearance of supermassive black holes motivates the question of whether dark matter can contribute to their rapid growth. In this talk, I will present a loss-cone framework for collisionless cold dark matter capture by early black hole seeds. The calculation combines a relativistic capture boundary with orbit-averaged angular-momentum diffusion and a quasi-static treatment of the...
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Siyu Zhou (University of Notre Dame)07/11/2026, 09:29
In this talk, I will show that although ultralight dark matter (ULDM) is often modeled as a scalar field with Gaussian fluctuations, its density perturbations are intrinsically non-Gaussian. I will explain the origin of this non-Gaussianity and discuss the resulting bispectrum, highlighting its universal power-law behavior for white-noise density perturbations with a characteristic scale set...
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tingyu li07/11/2026, 09:41
Inspired by string theory and cosmological constant problem, it is plausible that the Universe’s vacuum structure is characterized by a landscape of metastable vacua. If the dark vacuum is metastable, bubbles of lower-energy phases can nucleate at an approximately constant rate. Because the Hubble expansion rate is monotonically non-increasing with cosmic time, such nucleation can eventually...
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Scott Haselschwardt07/11/2026, 09:53
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Ernest Wallace (University of Pittsburgh)07/11/2026, 11:08
We implement the next-to-next-to-leading-order electroweak fermionic corrections in GRIFFIN, a C++ library for calculating fermion scattering and decay processes. In addition, we implement the corrections to these processes from tree-level SM-SMEFT interference. When first published, GRIFFIN contained full Standard Model electroweak NNLO corrections on the Z-resonance and NLO corrections...
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Carlos Henrique de Lima (University of Pittsburgh)07/11/2026, 11:20
In this talk, I will showcase how high-energy photon pair conversion inside the detector at lepton colliders can be used for polarimetry. I will discuss single and double conversions at Belle II, measuring polarization and quantum correlations in colliders of spatially separated GeV-scale photons.
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Marcel Yáñez Reyes (Michigan State University)07/11/2026, 11:32
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Dr Subhojit Roy (University of Cincinnati)07/11/2026, 11:44
Contrary to conventional expectations, we identify a class of extended scalar-sector scenarios in which final states with two, three, or four Higgs bosons constitute the leading discovery channels for new physics at the LHC. In these scenarios, higher-dimensional interactions, together with suppressed Higgs–scalar mixing near the alignment limit, reorganize the decay patterns of new scalar...
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Duarte Fontes (University of Pittsburgh)07/11/2026, 11:56
Precision measurements at colliders, including determinations of the top-quark mass and the strong coupling constant, require a good understanding of non-perturbative effects in QCD. One way to investigate these effects is to study the infrared sensitivity of perturbative predictions by introducing a fictitious gluon mass. However, this procedure is not generally consistent in the presence of...
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Tae Min Hong (University of Pittsburgh (US))07/11/2026, 12:08
We use the angular distribution of top quark pairs (tt¯) in the semileptonic final state bb¯ℓνqq¯′ to construct an anomaly detector for non-tt¯ events. Wigner D functions expand the distribution with coefficients determined by orthogonal series density estimation. Its equiprobable surfaces bin the events, the non-tt¯ concentrate at low tt¯ density. The separation is quantified by the...
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Raymond Co (Indiana University)07/11/2026, 13:25
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Dr Sai Chaitanya Tadepalli (Dept of Physics, Indiana University, Bloomington)07/11/2026, 14:25
Axions are among the most compelling candidates for dark matter and arise naturally in theories of fundamental physics. Their cosmological behavior, however, depends on assumptions about the underlying theory that are often taken for granted. One such assumption concerns the geometry associated with the fields describing the axion, which is usually assumed to be flat. In this talk, I will...
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Sagnik Mukherjee (University of Illinois Chicago)07/11/2026, 14:37
Dark matter communicating with the Standard Model solely via electroweak interactions provides a compelling picture. However, thermal freeze-out of electroweak doublet dark matter is generically strongly excluded by direct detection. We show that $SU(2)_L$ doublet fermion dark matter evades direct detection if its mass exceeds $10^{10} \text{ GeV}$. If the neutral Dirac fermion is split into a...
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Harman Singh (University of Pittsburgh)07/11/2026, 14:49
The observed matter-antimatter asymmetry can be generated dynamically via leptogenesis, where a non-zero lepton asymmetry is generated first and then gets converted into baryon asymmetry via sphalerons. Creation of non-zero lepton asymmetry typically requires lepton number violation (LNV), which, within the seesaw framework, results in the Majorana nature of light neutrinos. With no signs of...
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Taegyu Lee (Indiana University)07/11/2026, 15:01
In the Affleck–Dine mechanism, the baryon asymmetry is generated by the rotational motion of a scalar field along a flat direction. We study a concrete SUSY flat direction in which the same scalar field can generate baryon number as well as work as a curvaton. This well-motivated setup can naturally lead to a slightly red tilted spectrum with ns<1 which is usually non-trivial since it needs...
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Katherine Schwind (The Ohio State University)07/11/2026, 15:13
Though significant portions of parameter space have been ruled out, it may still be possible to discover new light exotic (LEX) states that interact directly with the Standard Model (SM). This talk will explore new states that couple to the SM through effective field theory (EFT) operators which describe interactions including at least one $W$ boson and one quark. Within this $W$-quark portal,...
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Morgan Cassidy07/11/2026, 15:55
In this talk, I will discuss Leggett-Garg Inequality (LGI) violation in polarized muon spin procession. I will explain the LGI reconstruction in this scenario, demonstrating how the muon's longitudinal polarization is inferred from the positron's energy spectrum. Using a rudimentary model for detector acceptance and efficiency, we claim LGI violated with a single-bin significance of 5.5$\sigma$.
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Artemiy Filippov (Michigan State University)07/11/2026, 16:07
Near the tt_bar production threshold, residual QCD attraction between the top and antitop binds them into short-lived, toponium-like quasi-bound states, an effect recently proposed as consistent with excess near-threshold tt_bar events reported at the LHC. Because the leading production channel is gluon fusion, any such enhancement has a direct implication for the determination of the gluon...
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Haoyuan Liu (Tsinghua University)07/11/2026, 16:19
It is widely believed that during inflation heavy particles (m ~ H up to 10^13 GeV) could be produced and they could leave imprints on large cosmic scales. This mechanism provides a unique window to explore physics at extremely high energy scales--a paradigm known as cosmological collider (CC) physics. The central observables in CC physics are correlation functions (inflation correlators) with...
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Swapnil Dutta07/11/2026, 16:31
We present the cosmology and observational probes of majoron dark matter in a high-scale seesaw framework with spontaneously broken lepton number. Right-handed neutrinos naturally generate light neutrino masses and can realize thermal leptogenesis, while the associated majoron is a light pseudoNambu-Goldstone boson that can be cosmologically stable and serve as a viable dark matter candidate...
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Francis Burk07/11/2026, 16:43
We investigate the prospects for improving the heavy neutral lepton (HNL) searches
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at the far-forward LHC experiments FASER and FASERν, as well as their proposed HL-LHC
successors, FASER2 and FASERν2, using new HNL production mechanisms. We consider sce-
narios in which HNLs couple directly to a new U (1) gauge boson and decay into visible Standard
Model final states through mixing with... -
Dr Toni Makela (University of California, Irvine)07/11/2026, 16:55
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Youle Su (University of Pittsburgh)
We present a quantum tomography study of fermion pair production at future $e^+e^-$ colliders, emphasizing how longitudinal beam polarization controls the two-qubit spin density matrix. We study the processes $e^+ e^- \to t\bar{t},\ e^+e^-\to \mu^+\mu^-$ and Bhabha scattering $e^+e^-\to e^+e^-$, representing the mass threshold behavior, the $Z$ pole resonance and the $s/t$-channel interplay....
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Rahul Pradeep (University of Cincinnati)
We examine the sensitivity of the EMD as a measure of CP violation in three body decays. A simplified model of the $B^0 \rightarrow \pi^{+}\pi^{-}\pi^{0}$ decay is used for this test, while including the time dependent mixing effects. We use this to test the hypothesis of observable CP violation in the time dependent decay rate and find that the EMD is capable of detecting effects up to the...
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