A5015297272- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Social and Economic Solidarity
- Astrophysics and Cosmic Phenomena
- Education Pedagogy and Practices
- Science and Education Research
- Gamma-ray bursts and supernovae
- Education and Digital Technologies
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
Goddard Space Flight Center
2025
National Postdoctoral Association
2025
Carleton University
2019-2023
Université Paris-Sud
2018-2019
Centre National de la Recherche Scientifique
2018-2019
Université Paris-Saclay
2018-2019
Laboratoire de Physique Théorique
2018
Université Paris Cité
2018
Universidade Federal da Paraíba
2015
Universidade Federal do Pará
2015
We generalize models invoking a spin-2 particle as mediator between the dark sector and standard model. show that massive messenger can efficiently play role of portal two sectors. The matter is then produced via freeze-in mechanism during reheating epoch. In large part parameter space, production through exchange dominates over processes involving graviton with Planck suppressed couplings. perform systematic analysis such for different values mass relative to maximum final temperature...
We study the freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter candidates through a neutrino portal. consider hidden sector comprised fermion and complex scalar, with lightest one regarded as FIMP candidate. implement Type-I Seesaw mechanism for generating masses Standard Model (SM) neutrinos three heavy neutrinos, responsible mediating interactions between SM sectors. assume that an early matter-dominated era (EMDE) took place some period inflation Big Bang...
We outline the unique opportunities and challenges in search for “ultraheavy” dark matter candidates with masses between roughly 10 TeV Planck scale m_{\rm pl} ≈ 10^{16} TeV. This mass range presents a wide relatively unexplored parameter space, rich space of possible models cosmic histories. emphasize that both current detectors new, targeted techniques, via direct indirect detection, are poised to contribute searches ultraheavy particle coming decade. highlight need new developments this...
We demonstrate that in a class of the $U(1{)}^{\ensuremath{'}}$ extension Standard Model (SM), under which all matter fields are uncharged and additional neutral gauge boson ${Z}^{\ensuremath{'}}$ couples to set heavy nonstandard fermions, dark (DM) production mediated by can proceed through generation generalized Chern-Simons (GCS) couplings. The origin GCS terms is intimately connected cancellation anomalies. show DM cross section triggered couplings sufficient even for an intermediate...
We discuss the phenomenology of an MeV-scale Dirac fermion coupled to Standard Model through a dark photon with kinetic mixing electromagnetic field. compute matter relic density and explore interplay direct detection accelerator searches for photons. show that precise measurements temperature polarization power spectra Cosmic Microwave Background Radiation lead stringent constraints, leaving small window thermal production this MeV candidate. The forthcoming gamma-ray telescope e-ASTROGAM...
We show that moduli fields as mediators between the Standard Model and dark sector can naturally lead to observed relic abundance. Indeed, even if are very massive, nature of their couplings with matter gauge allows producing a sufficiently large amount in early Universe through freeze-in mechanism. Moreover, complex whose real imaginary part couple differently thermal bath gives an interesting unusual phenomenology compared other models type.
Dark matter may consist of feebly interacting massive particles (FIMPs) that never thermalized with the cosmic plasma. Their relic density is achieved via freeze-in for a wide range masses, significantly expanding model space can be tested compared to other production mechanisms. However, testing tiny couplings required by challenging. We show FIMPs probed LHC searches new physics in monojet events large missing energy. study ${Z}^{\ensuremath{'}}$ portal which gluon annihilation produces...
A bstract We discuss a model where mixed warm and hot keV neutrino dark matter rises naturally. arrange active sterile neutrinos in the same SU(3) L multiplet, with lightest being matter. The other two heavy neutrinos, through their out-of-equilibrium decay, contribute both to dilution of density its population, after freeze-out. show that this features all ingredients overcome overproduction matter, explore phenomenological implications for Big Bang Nucleosynthesis number relativistic...
We update the parameter space of a singlet Majorana fermion dark matter model, in which standard particles interact with sector through mixing scalar and Higgs boson. In this model both carry lepton number, latter being bilepton. The stability is achieved by supposed Z 2 symmetry. number symmetry breaking scale, driven scalar, constrained to be within hundreds thousands GeV, so as give sufficiently abundant fermion. Relic density, direct detection invisible decay are considered complementary...
Weakly Interacting Massive Particles (WIMPs) continue to be considered some of the best-motivated Dark Matter (DM) candidates. No conclusive signal, despite an extensive search program that combines, often in a complementary way, direct, indirect, and collider probes, has been however detected so far. This situation might change near future with advent even larger, multi-ton Direct Detection experiments. We provide here updated review WIMP paradigm, focus on selected models can probed...
In this conference, I have talked about two scenarios in which the out-of-equilibrium production of dark matter (DM) particles early universe is unavoidable. first one \cite{bhattacharyya_freezing-dark_2018}, we extend standard model (SM) particle physics by an extra $U(1)$ gauge group under all SM are neutral. We then consider DM candidates interacting only with new spin-1 boson, a heavy $Z^\prime$. assume presence beyond fermions charged both and $SU(3)_c$, allowing for feeble connection...
The freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter in the early universe is an appealing alternative to well-known - and constrained Weakly (WIMP) paradigm. Although challenging, phenomenology FIMP has been receiving growing attention possible a few scenarios. In this work, we contribute endeavor by considering $Z^\prime$ portal fermionic matter, with having both vector axial couplings mass ranging from MeV up PeV. We evaluate bounds on freeze-out direct...
We outline the unique opportunities and challenges in search for "ultraheavy" dark matter candidates with masses between roughly $10~{\rm TeV}$ Planck scale $m_{\rm pl} \approx 10^{16}~{\rm TeV}$. This mass range presents a wide relatively unexplored parameter space, rich space of possible models cosmic histories. emphasize that both current detectors new, targeted techniques, via direct indirect detection, are poised to contribute searches ultraheavy particle coming decade. highlight need...
Contemporary society is characterized by excessive consumption and unrestrained entertainment, which are central to modern capitalism. The expansion of the entertainment industry promotes creation circulation content that encourages relentless consumption, impacting behaviors, values, individual collective identities. Entertainment, should function as a means leisure culture, has transformed into commodity aimed at continuous sale products experiences. In this way, large corporations in...
The present work entitled "Bodily Reflection: Innovative Practices in the Training of Physical Education Teachers" addresses importance articulating bodily practice with critical reflection teacher training process physical education. central proposal is to discuss how new pedagogical approaches can contribute development innovative practices teaching this subject, considering challenges faced by teachers training. Bodily reflection, understood as a that unites theory and practice, emerges...
Sustainability has emerged as one of the most urgent and relevant topics in contemporary society, due to environmental, social economic challenges that world faces. Population growth, accelerated urbanization excessive consumption natural resources have generated serious environmental impacts, such climate change, resource depletion loss biodiversity. In this context, debate on sustainability becomes essential find solutions promote a balance between development, justice preservation. Modern...