TDLI-PKU BSM Workshop 2023: Looking to the Sky

Session

Parallel talks (2)

3 Aug 2023, 13:30

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

64. Tachyonic Instability Induced Gravitational Waves at the PTA and CMB

Sida Lu (HKUST)

03/08/2023, 13:30

When coupled to massless vector bosons, axion-like particles are known to generate a tachyonic instability as they start to roll down from the potential, which exponentially amplifies the vector boson wave functions. This drastic enhancement will in turn source gravitational waves that may be relevant for various experiments and observations. If the axion-like particles' rolling starts at a...

62. Dark matter freeze-in gauged $U(1)_{B-3L_i}$ extensions

Lopamudra Mukherjee (Nankai University)

03/08/2023, 13:50

We consider a two-step freeze-in mechanism of a singlet fermionic dark matter (DM) $\chi$ in a gauged $U(1)_{B-3L_i}$, $i \in \{e,\mu,\tau\}$, extension of the Standard model (SM). The DM communicates with the SM only through flavorful vector-portal $Z_{B3L}$ due to its non-trivial charge $x$ under $U(1)_{B-3L_i}$, which also guarantees the stability of the DM over the age of the Universe for...

63. Search for Ultralight Dark Matter with Space-based Gravitational-Wave Interferometry

Yong Tang (University of Chinese Academy of Sciences)

03/08/2023, 14:10

Ultralight particles are well-motivated in many physical theories beyond Standard Model of particle physics. They can also be Dark Matter candidates. If these ultralight fields couple to standard model particles, they would show as additional signals with characteristic features. We show future space-based gravitational-wave interferometry can serve as a sensitive method to detect these light...

65. Sphaleron in the Higgs Triplet Model

Bingrong Yu (IHEP)

03/08/2023, 14:30

The Higgs triplet model (HTM) extends the Standard Model (SM) by one complex triplet scalar (also known as the type-II seesaw model), offering a simple and viable way to account for nonzero neutrino masses. On the other hand, the nontrivial couplings of the triplet to the gauge fields and to the SM Higgs field are expected to influence the topological vacuum structure of the SM and,...

66. Diagrammatic structures of the Nielsen identity

Yi-Lei Tang (中山大学)

03/08/2023, 14:50

The Nielsen identity is crucial for the gauge dependence of various observables associated with the effective potential. Usually when calculated up to a definite order, it is difficult to acquire a gauge-independent result since the incomplete resummation processes. In the literature, Nielsen identity was usually induced through a path-integral way, while the discussions of the...