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Search: authors:"Sandhya Choubey"

10 papers found.
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Inflation and dark matter in the inert doublet model

We discuss inflation and dark matter in the inert doublet model coupled non-minimally to gravity where the inert doublet is the inflaton and the neutral scalar part of the doublet is the dark matter candidate. We calculate the various inflationary parameters like n s , r and P s and then proceed to the reheating phase where the inflaton decays into the Higgs and other gauge bosons ...

FIMP and muon (g − 2) in a U(1) Lμ−Lτ model

The tightening of the constraints on the standard thermal WIMP scenario has forced physicists to propose alternative dark matter (DM) models. One of the most popular alternate explanations of the origin of DM is the non-thermal production of DM via freeze-in. In this scenario the DM never attains thermal equilibrium with the thermal soup because of its feeble coupling strength ...

Search for the sterile neutrino mixing with the ICAL detector at INO

The study has been carried out on the prospects of probing the sterile neutrino mixing with the magnetized iron calorimeter (ICAL) at the India-based Neutrino Observatory (INO), using atmospheric neutrinos as a source. The so-called 3 \(+\) 1 scenario is considered for active–sterile neutrino mixing and lead to projected exclusion curves in the sterile neutrino mass and mixing ...

Neutrino mass, dark matter and anomalous magnetic moment of muon in a \( \mathrm{U}{(1)}_L{{}_{{}_{\mu}}}_{-}{{}_L}_{{}_{\tau }} \) model

The observation of neutrino masses, mixing and the existence of dark matter are amongst the most important signatures of physics beyond the Standard Model (SM). In this paper, we propose to extend the SM by a local L μ −L τ gauge symmetry, two additional complex scalars and three right-handed neutrinos. The L μ − L τ gauge symmetry is broken spontaneously when one of the scalars ...

Galactic gamma ray excess and dark matter phenomenology in a U(1) B−L model

In this work, we have considered a gauged U(1)B−L extension of the Standard Model (SM) with three right handed neutrinos for anomaly cancellation and two additional SM singlet complex scalars with nontrivial B-L charges. One of these is used to spontaneously break the U(1)B−L gauge symmetry, leading to Majorana masses for the neutrinos through the standard Type I seesaw mechanism, ...

A combined study of source, detector and matter non-standard neutrino interactions at DUNE

We simultaneously investigate source, detector and matter non-standard neutrino interactions at the proposed DUNE experiment. Our analysis is performed using a Markov Chain Monte Carlo exploring the full parameter space. We find that the sensitivity of DUNE to the standard oscillation parameters is worsened due to the presence of non-standard neutrino interactions. In particular, ...

Exploring source and detector non-standard neutrino interactions at ESSνSB

We investigate source and detector non-standard neutrino interactions at the proposed ESSνSB experiment. We analyze the effect of non-standard physics at the probability level, the event-rate level and by a full computation of the ESSνSB setup. We find that the precision measurement of the leptonic mixing angle θ 23 at ESSνSB is robust in the presence of non-standard interactions, ...

Probing neutrino oscillation parameters using high power superbeam from ESS

A high-power neutrino superbeam experiment at the ESS facility has been proposed such that the source-detector distance falls at the second oscillation maximum, giving very good sensitivity towards establishing CP violation. In this work, we explore the comparative physics reach of the experiment in terms of leptonic CP-violation, precision on atmospheric parameters, non-maximal θ ...

The use of mosquito repellents at three sites in India with declining malaria transmission: surveys in the community and clinic

Background Repellents such as coils, vaporizers, mats and creams can be used to reduce the risk of malaria and other infectious diseases. Although evidence for their effectiveness is limited, they are advertised as providing an additional approach to mosquito control in combination with other strategies, e.g. insecticide-treated nets. We examined the use of repellents in India in ...

Working group report: Neutrino physics

identified, along with the name of the discussion leader: 1. Viable model for the 3+2 mass spectrum Werner Rodejohann 2. Dirac see-saw and leptogenesis Sandhya Choubey 3. Neutrino telescopes and parameter