scholarly journals Some Issues Related to the Direct Detection of Dark Matter

2021 ◽  
Vol 12 ◽  
pp. 1
Author(s):  
J. D. Vergados
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Branching Ratios ◽  
The Novel ◽  
Modulation Effect ◽  
The Earth ◽  
Nuclear Levels ◽  
Event Rates ◽  
Theoretical Issues

In this paper we review the theoretical issues involved in the direct detectionof supersymmetric (SUSY) dark matter. After a brief discussion of the allowedSYSY parameter space we focus on the determination of the traditional neutralinodetection rates, in experiments which measure the energy of the recoiling nucleus,such as the coherent and spin induced rates and the dependence of the rate onthe motion of the Earth (modulation effect). Then we examine the novel featuresappearing in directional experiments, which detect the recoiling nucleus in a givendirection. Next we estimate the branching ratios for transitions to accessibleexcited nuclear levels. Finally we estimate the event rates leading to the atomionization and subsequent detection of the outgoing electrons.

WIMP event rates in directional experiments: The diurnal variation signature

Open Physics ◽  
2011 ◽  
Vol 9 (3) ◽  
Author(s):  
John Vergados ◽  
Charalampos Moustakidis
Keyword(s):  
Dark Matter ◽  
Diurnal Variation ◽  
Cold Dark Matter ◽  
Vacuum Energy ◽  
Direct Detection ◽  
Weakly Interacting Massive Particles ◽  
The Earth ◽  
Event Rates ◽  
Matter Detection ◽  
Direct Dark Matter

AbstractThe recent WMAP data have confirmed that exotic dark matter together with the vacuum energy (cosmological constant) dominate in the flat Universe. Modern particle theories provide viable cold dark matter candidates with masses in the GeV-TeV region. All such candidates will be called WIMPs (Weakly Interacting Massive Particles). The nature of dark matter can only be unraveled by its direct detection in the laboratory. In this work we present some theoretical elements relevant to the direct dark matter detection experiments, paying particular attention to directional experiments, i.e. experiments in which not only the energy but the direction of the recoiling nucleus is observed. Since the direction of observation is fixed with respect to the Earth, while the Earth is rotating around its axis, in a directional experiment the angle between the direction of observation and the Sun’s direction of motion will change during the day. So, since the event rates sensitively depend on this angle, the observed signal in such experiments will exhibit very interesting and characteristic periodic diurnal variation.

scholarly journals Direct detection of mirror matter in Twin Higgs models

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Zackaria Chacko ◽  
David Curtin ◽  
Michael Geller ◽  
Yuhsin Tsai
Keyword(s):  
Dark Matter ◽  
Cooling Rate ◽  
Direct Detection ◽  
The Earth ◽  
Electron Recoil ◽  
The Galaxy ◽  
The Masses ◽  
Event Rates ◽  
Modest Effect ◽  
Mirror Matter

Abstract We explore the possibility of discovering the mirror baryons and electrons of the Mirror Twin Higgs model in direct detection experiments, in a scenario in which these particles constitute a subcomponent of the observed DM. We consider a framework in which the mirror fermions are sub-nano-charged, as a consequence of kinetic mixing between the photon and its mirror counterpart. We consider both nuclear recoil and electron recoil experiments. The event rates depend on the fraction of mirror DM that is ionized, and also on its distribution in the galaxy. Since mirror DM is dissipative, at the location of the Earth it may be in the form of a halo or may have collapsed into a disk, depending on the cooling rate. For a given mirror DM abundance we determine the expected event rates in direct detection experiments for the limiting cases of an ionized halo, an ionized disk, an atomic halo and an atomic disk. We find that by taking advantage of the complementarity of the different experiments, it may be possible to establish not just the multi-component nature of mirror dark matter, but also its distribution in the galaxy. In addition, a study of the recoil energies may be able to determine the masses and charges of the constituents of the mirror sector. By showing that the mass and charge of mirror helium are integer multiples of those of mirror hydrogen, these experiments have the potential to distinguish the mirror nature of the theory. We also carefully consider mirror plasma screening effects, showing that the capture of mirror dark matter particles in the Earth has at most a modest effect on direct detection signals.

Effects ofCPviolation on event rates in the direct detection of dark matter

1999 ◽  
Vol 60 (6) ◽  
Author(s):  
Utpal Chattopadhyay ◽  
Tarek Ibrahim ◽  
Pran Nath
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Event Rates

scholarly journals EFFECTS OF RESIDUE BACKGROUND EVENTS IN DIRECT DETECTION EXPERIMENTS ON IDENTIFYING WIMP DARK MATTER

2011 ◽  
Vol 20 (08) ◽  
pp. 1453-1461 ◽  
Author(s):  
CHUNG-LIN SHAN
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Weakly Interacting Massive Particles ◽  
Data Sets ◽  
Model Independent ◽  
Using Data ◽  
Background Events ◽  
Matter Detection ◽  
Direct Dark Matter

We reexamine the model-independent data analysis methods for extracting properties of Weakly Interacting Massive Particles (WIMPs) by using data (measured recoil energies) from direct Dark Matter detection experiments directly and, as a more realistic study, consider a small fraction of residue background events, which pass all discrimination criteria and then mix with other real WIMP-induced signals in the analyzed data sets. In this talk, the effects of residue backgrounds on the determination of the WIMP mass as well as the spin-independent WIMP coupling on nucleons will be discussed.

scholarly journals Astrophysics-independent determination of dark matter parameters from two direct detection signals

2019 ◽  
Vol 26 ◽  
pp. 100393 ◽  
Author(s):  
Juan Herrero-García ◽  
Yannick Müller ◽  
Thomas Schwetz
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Independent Determination

scholarly journals DAMA/LIBRA Results and Perspectives

2018 ◽  
Vol 182 ◽  
pp. 02027 ◽  
Author(s):  
R. Bernabei ◽  
P. Belli ◽  
F. Cappella ◽  
V. Caracciolo ◽  
R. Cerulli ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galactic Halo ◽  
Side Reaction ◽  
Modulation Effect ◽  
Annual Modulation ◽  
Annual Cycles ◽  
The Earth ◽  
Shadowing Effect ◽  
Increased Sensitivity ◽  
Model Independent

The DAMA/LIBRA experiment (~ 250 kg sensitive mass composed by highly radio-pure NaI(Tl)) is in data taking in the underground Laboratory of Gran Sasso (LNGS). In its first phase (DAMA/LIBRA-phase1) this experiment and the former DAMA/NaI experiment (~ 100 kg of highly radio-pure NaI(Tl)) collected data for 14 independent annual cycles, exploiting the model-independent Dark Matter (DM) annual modulation signature (total exposure 1.33 ton x yr). A DM annual modulation effect has been observed at 9.3 σ C.L., supporting the presence of DM particles in the galactic halo. No systematic or side reaction able to mimic the observed DM annual modulation has been found or suggested by anyone. Recent analyses on possible diurnal effects, on the Earth shadowing effect and on possible interpretation in terms of Mirror DM will be mentioned. At present DAMA/LIBRA is running in its phase2 with increased sensitivity.

scholarly journals Indirect Searches for Dark Matter with IceCube

2019 ◽  
Vol 207 ◽  
pp. 04006
Author(s):  
Juan Antonio Aguilar Sánchez
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Gamma Rays ◽  
Direct Detection ◽  
Neutrino Telescope ◽  
The Sun ◽  
Particle Detector ◽  
Decay Products ◽  
The Earth ◽  
Modern Cosmology

The nature of dark matter remains one of the unsolved questions in modern cosmology and to understand its properties different experimental avenues are being explored. Indirect searches make use of the annihilation or decay products of dark matter as tracers to prove its existence. Unlike direct detections methods, indirect searches do not require specialized detectors as existing astro-particle experiments and facilities can be used to search for signatures of dark matter. Among the decay and annihilation products, neutrinos offer a unique way to search for dark matter since their low cross-section makes them capable of escaping from environments in which gamma rays will be absorbed, like the Sun or the Earth. The IceCube neutrino telescope is not only an excellent astro-particle detector, it also has lively program on dark matter searches with very competitive and complementary results to direct detection limits. These proceedings review the latests results of IceCube regarding the indirect search of dark matter with neutrinos.

scholarly journals Migrant’s Semiotics in the novel “The 45th Parallel” by Polina Zherebtsova

2019 ◽  
Vol 69 ◽  
pp. 00078
Author(s):  
Alexandra Milostivaya ◽  
Ludmila Bronskaya ◽  
Irina Makhova ◽  
Olga Chudnov ◽  
Natalia Kizilova
Keyword(s):  
Interpersonal Relations ◽  
Linguistic Analysis ◽  
The Novel ◽  
Semiotic Analysis ◽  
North Caucasus ◽  
The Earth ◽  
The World ◽  
Behavior Based

The article is devoted to the socio-cultural and linguistic analysis of the characteristics of mutual penetration and mutual determination of Christian and Muslim semiotic culture codes in migration discourse of North Caucasus that creates the effect of syncretism of “ours” and “theirs” in speech behavior based on the novel “The 45th Parallel” by Polina Zherebtsova. The story takes place in Stavropol, on the 45th Parallel of the Earth. The documentary novel written in 2005 – 2006 is based on personal diaries of the author, a refugee from Grozny. The aim of this article is to analyze mentalities of Russian (Christian) refugees from the Chechen Republic in the fiction. The research makes it possible to conclude that secondary acculturation of migrants has modified their axiological picture of the world, psychology, lifestyle and sociocultural habits of migrants; together with attributes of their culture, they have preserved relics of the worldview of societies, which they have left. So it is possible to speak about a palimpsest of Christian and Muslim semiotic culture codes “Clothes”, “Food”, and “Interpersonal relations” in migration discourse of North Caucasus. The main methods of the research are the semiotic analysis and the hermeneutic interpretation of discourse.

THE SEARCH FOR DARK MATTER FROM SPACE AND ON THE EARTH

2007 ◽  
Vol 16 (12b) ◽  
pp. 2365-2375
Author(s):  
DAVID B. CLINE
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Sterile Neutrinos ◽  
The Earth

We first show that the MOND concept is very unlikely: nonbaryonic dark matter exists. We then discuss dwarf special galaxies that in some cases appear to be nearly pure dark matter systems. The search for dark matter particles can be carried out from space (sterile neutrinos neutralino annihilation) or on the Earth (direct detection). We describe progress in these areas and focus on the progress of the ZEPLIN II detector now taking data.1,2.

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