Conveners
Parallel - Dark Matter: Session 1
- Bhawna Gomber
Parallel - Dark Matter: Session 2
- Suchita Kulkarni
Parallel - Dark Matter: Session 3
- Ranjan Laha
Strong first-order phase transitions (SFOPT), a necessary ingredient for the Electroweak Baryogenesis (EWBG) to incorporate the observed baryon asymmetry, can give rise to stochastic Gravitational Waves (GW). Understanding the sources of such primordial waves can complement the collider searches of new physics Beyond the Standard Model (BSM). In this work, we investigate the GW production from...
$U(1)$ extension of the Standard Model is well motivated, where the charges of SM fermions are fixed by gauge anomaly cancellations and Yukawa interactions. While the literature extensively discusses anomaly cancellation solutions in which SM fermions are vector-like under new symmetry, allowing the Yukawa structure to remain invariant, chiral solutions in which SM fermions are chiral under...
A search is conducted for dark matter pair-production using the Dark Matter simplified model and for graviton production predicted by the ADD large extra dimensions model in a final state with a photon and missing transverse energy in pp collisions at sqrt(s) = 13 TeV. Data taken by the CMS experiment at the CERN LHC in Full Run2, corresponding to an integrated luminosity of 137.2 fb-1, is...
Several studies have shown that dark matter halo properties like concentration, triaxiality, and spin play an important role in bar instability dynamics. Building on these insights, we investigated the role of the inner (within the disk region) halo angular momentum distribution on bar formation and evolution processes. We conducted a series of high-resolution N-body simulations of Milky...
Various cosmological observations suggest that 85% matter of the Universe is cold dark matter (DM), a non-luminous substance that does not interact with photons and interacts only “weakly” with ordinary matter. Despite no conclusive DM discovery, various experiments, including direct and indirect detection experiments and collider searches, have imposed very tight constraints on its...
In a dark matter (DM) annihilation process $\chi \bar{\chi} \to f \bar{f} \gamma$ , real photon emission and absorption processes along side with virtual correction $\chi \bar{\chi} \to f \bar{f} $ , contribute to annihilation cross section. We present thermal correction at NLO of annihilation cross section of DM through real photon emission and absorption processes utilizing techniques of...
The question that what constitutes Dark Matter (DM) is one of the most pressing ones in contemporary physics, and one that has not been answered to any degree so far. Primordial Black Holes (PBHs) are one of the most well-motivated dark matter candidates. PBHs which are light enough that the Hawking radiation is substantial have been constrained by either the non-detection of the radiation...
Recently, Tibet AS$_\gamma$ and LHAASO have observed very high energy diffuse gamma rays in the Galactic place between 10 TeV and 1 PeV energies. In our work, we utilize these observations to search for dark matter decay or annihilation signals to Standard Model particles. In addition to the primary gamma-ray originating from various Standard Model particles, we also include secondary...
We study the phenomenology of a vector dark matter (VDM) in a U(1)X gauged extension of the Standard Model (SM) which is connected to the type II seesaw framework via the Higgs portal. When this U(1)X symmetry is spontaneously broken by the vacuum expectation value (VEV) of a complex scalar singlet, the gauge boson Z′ becomes massive. The stability of the dark matter (DM) is ensured by the...
The neutrino floor is a theoretical lower limit on dark matter-nucleon scattering cross-section computed in WIMP-like dark matter models that are being probed in direct detection experiments. Neutrino floor, which defines the extent of the neutrino background, can be modified in a BSM set up that is important from the DM detection perspective. We work in a BSM set up which is very natural like...
Primordial black holes (PBHs) in the mass range $10^{-16}-10^{-11}~M_\odot$ may constitute all the dark matter.
We show that gravitational microlensing of bright x-ray pulsars provide the most robust and immediately implementable opportunity to uncover PBH dark matter in this mass window.
As proofs of concept, we show that the currently operational NICER telescope can probe this window near...
Dark matter (DM) particles can get captured inside the Sun due to DM-electron interaction. As the number of these captured DM particles increases, they can annihilate and produce different Standard Model (SM) final states. Neutrinos and anti-neutrinos produced from these final states can escape the Sun and reach ground-based neutrino telescopes. The latest data-sets from IceCube and DeepCore...
Dark matter(DM) has been studied with consideration of many different symmetries and particle content. But it's detection has stayed as ever illusive. In this talk I will present a work where we considered an addition of vector like quark(VLQ) to a very well known DM model, Inert Doublet Model(IDM). The addition of VLQ not only enrich the freeze out mechanism of IDM dark matter but the also...
Isolated ideal neutron stars (NS) of age $>10^9$ yrs exhaust thermal and rotational energies and cool down to temperatures below $\mathcal{O}(100)$ 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 $\sim 2550$ K in the best case scenario. The maximum accretion rate depends...
We worked on a model for hybrid neutrino mass generation, wherein scotogenic dark sector particles, including dark matter, are charged non-trivially under the $A_4$ flavor symmetry. The spontaneous breaking of the $A_4$ group to the residual $Z_2$ subgroup results in the “cutting” of the radiative loop. As a consequence the neutrinos acquire mass through the hybrid “scoto-seesaw” mass...
We study the boosted dark matter (BDM) scenario in a two-component model. We consider a neutrinophilic two-Higgs doublet model ($\nu 2$HDM), which comprises of one extra Higgs doublet and a light right-handed neutrino. This model is extended with a light ($\sim 10$ MeV) singlet scalar DM $\phi_3$, which is stabilized under an extra dark $Z_2^{\rm DM}$ symmetry and can only effectively...
The Dirac scotogenic model provides an elegant mechanism which generates small Dirac neutrino masses at the one loop level with a single symmetry, the so-called chiral $U(1)_{B-L}$, simultaneously protecting the ``Diracness'' of the neutrinos, the smallness of their mass and the stability of the dark matter candidate. Despite being chiral, this symmetry is also anomaly-free and thus could be...
In this talk, we present a model for the radiative neutrino mass mechanism in which the particles within the loops are characterized by milli-charges. Unlike the conventional scotogenic model, our approach avoids imposing a discrete symmetry or expanding the gauge sector. The minuscule electric charges ensure the stability of the lightest particle within the loop as a viable dark matter...
We study the possibility of generating baryon asymmetry of the universe from dark matter (DM) annihilations during non-standard cosmological epochs. Considering the DM to be of weakly interacting massive particle (WIMP) type, the generation of baryon asymmetry via leptogenesis route is studied where WIMP DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal particle physics...
We propose a novel method to determine the mass scale of ambient dark matter that can be generally applied to the (at least effectively) two-dimensional direct detection experiments allowing for directional observables. Due to the motions of the solar system and the Earth relative to the galactic center and the Sun, the dark-matter flux carries a directional preference. We first formulate that...
We explore a case of multi-particle dark matter with symmetric and asymmetric dark matter components in a model-independent approach. Starting from the Boltzmann equations for the multi-particle system, we focus on scenarios where one of the DM candidates is hidden from the visible sector. We also comment on the effect of non-standard expansion of the universe on the dark matter relic abundance.
Interaction between two dark matter (DM) components plays a crucial role in DM production, dynamics and phenomenology in multicomponent DM scenarios. We propose and study a new kind of DM, called pseudo-FIMP (pFIMP), which can be realised in a two-component DM setup. pFIMP is feebly connected to the visible sector but remains in thermal equilibrium by sufficient interaction with a thermal DM...
