Can New Interactions with Dark Matter Lead to Flux Change of Astrophysical Neutrinos at Icecube?

2021 ◽  
pp. 977-980
Author(s):  
Sujata Pandey
Keyword(s):  
Dark Matter ◽  
Flux Change ◽  
Astrophysical Neutrinos ◽  
New Interactions

scholarly journals Dark matter-deficient dwarf galaxies form via tidal stripping of dark matter in interactions with massive companions

2021 ◽  
Vol 502 (2) ◽  
pp. 1785-1796
Author(s):  
R A Jackson ◽  
S Kaviraj ◽  
G Martin ◽  
J E G Devriendt ◽  
A Slyz ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Evolution ◽  
Cold Dark Matter ◽  
Dwarf Galaxies ◽  
Stellar Mass ◽  
Matter Content ◽  
Mass Relation ◽  
Potential Wells ◽  
Tidal Interactions ◽  
New Interactions

ABSTRACT In the standard ΛCDM (Lambda cold dark matter) paradigm, dwarf galaxies are expected to be dark matter-rich, as baryonic feedback is thought to quickly drive gas out of their shallow potential wells and quench star formation at early epochs. Recent observations of local dwarfs with extremely low dark matter content appear to contradict this picture, potentially bringing the validity of the standard model into question. We use NewHorizon, a high-resolution cosmological simulation, to demonstrate that sustained stripping of dark matter, in tidal interactions between a massive galaxy and a dwarf satellite, naturally produces dwarfs that are dark matter-deficient, even though their initial dark matter fractions are normal. The process of dark matter stripping is responsible for the large scatter in the halo-to-stellar mass relation in the dwarf regime. The degree of stripping is driven by the closeness of the orbit of the dwarf around its massive companion and, in extreme cases, produces dwarfs with halo-to-stellar mass ratios as low as unity, consistent with the findings of recent observational studies. ∼30 per cent of dwarfs show some deviation from normal dark matter fractions due to dark matter stripping, with 10 per cent showing high levels of dark matter deficiency (Mhalo/M⋆ < 10). Given their close orbits, a significant fraction of dark matter-deficient dwarfs merge with their massive companions (e.g. ∼70 per cent merge over time-scales of ∼3.5 Gyr), with the dark matter-deficient population being constantly replenished by new interactions between dwarfs and massive companions. The creation of these galaxies is therefore a natural by-product of galaxy evolution and their existence is not in tension with the standard paradigm.

scholarly journals Exploring Neutrino-Dark Matter Interaction via Astrophysical Neutrinos at IceCube

2020 ◽  
Author(s):  
Sujata Pandey ◽  
◽  
Siddhartha Karmakar ◽  
Subhendu Rakshit
Keyword(s):  
Dark Matter ◽  
Matter Interaction ◽  
Astrophysical Neutrinos

scholarly journals Dark matter direct detection from new interactions in models with spin-two mediators

2018 ◽  
Vol 2018 (6) ◽  
Author(s):  
A. Carrillo-Monteverde ◽  
Yoo-Jin Kang ◽  
Hyun Min Lee ◽  
Myeonghun Park ◽  
Veronica Sanz
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
New Interactions

scholarly journals Astronomy with energy dependent flavour ratios of extragalactic neutrinos

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Siddhartha Karmakar ◽  
Sujata Pandey ◽  
Subhendu Rakshit
Keyword(s):  
Dark Matter ◽  
Energy Dependence ◽  
High Energy ◽  
Neutrino Energy ◽  
Density Profiles ◽  
Neutrino Telescopes ◽  
Astrophysical Neutrinos ◽  
Astrophysical Objects ◽  
Energy Dependent

Abstract High energy astrophysical neutrinos interacting with ultralight dark matter (DM) can undergo flavour oscillations that induce an energy dependence in the flavour ratios. Such a dependence on the neutrino energy will reflect in the track to shower ratio in neutrino telescopes like IceCube or KM3NeT. This opens up a possibility to study DM density profiles of astrophysical objects like AGN, GRB etc., which are the suspected sources of such neutrinos.

scholarly journals Erratum to: Interactions of astrophysical neutrinos with dark matter: a model building perspective

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Sujata Pandey ◽  
Siddhartha Karmakar ◽  
Subhendu Rakshit
Keyword(s):  
Dark Matter ◽  
Model Building ◽  
Astrophysical Neutrinos

scholarly journals Interactions of astrophysical neutrinos with dark matter: a model building perspective

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Sujata Pandey ◽  
Siddhartha Karmakar ◽  
Subhendu Rakshit
Keyword(s):  
Dark Matter ◽  
Model Building ◽  
Astrophysical Neutrinos

Principles of Low-Vacuum SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1304-1305
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
New Technologies ◽  
High Vacuum ◽  
Optical Microscope ◽  
Specimen Surface ◽  
Electrical Field ◽  
Gaseous Environment ◽  
New Information ◽  
Gas Molecules ◽  
New Interactions ◽  
Gas Pressures

Only recently it became possible to expand scanning electron microscopy to low vacuum and atmospheric pressure through the introduction of several new technologies. In principle, only the specimen is provided with a controlled gaseous environment while the optical microscope column is kept at high vacuum. In the specimen chamber, the gas can generate new interactions with i) the probe electrons, ii) the specimen surface, and iii) the specimen-specific signal electrons. The results of these interactions yield new information about specimen surfaces not accessible to conventional high vacuum SEM. Several microscope types are available differing from each other by the maximum available gas pressure and the types of signals which can be used for investigation of specimen properties.Electrical non-conductors can be easily imaged despite charge accumulations at and beneath their surface. At high gas pressures between 10-2 and 2 torr, gas molecules are ionized in the electrical field between the specimen surface and the surrounding microscope parts through signal electrons and, to a certain extent, probe electrons. The gas provides a stable ion flux for a surface charge equalization if sufficient gas ions are provided.

First runs with the ORPHEUS dark matter detector

2002 ◽  
Vol 110 (2) ◽  
pp. 106-108
Author(s):  
G Czapek
Keyword(s):  
Dark Matter

Baryonic dark matter

2002 ◽  
Vol 110 (2) ◽  
pp. 16-25 ◽  
Author(s):  
R Rebolo
Keyword(s):  
Dark Matter ◽  
Baryonic Dark Matter
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