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We describe a new mechanism of dark matter production.
Open accessJournal ArticleDOI
Nayara Fonseca, Enrico Morgante 
10 Sep 2019-Physical Review D
23 Citations
Using this framework we show that the relaxion is a phenomenologically viable dark matter candidate in the keV mass range.
Open accessJournal ArticleDOI
22 Citations
Interestingly, this new asymmetric WIMP framework can accommodate a wide range of dark matter masses and annihilation cross sections.
We propose a new production mechanism for keV sterile neutrino Dark Matter.

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What implications could have in a family problem?
4 answers
The "family problem" in particle physics refers to the mystery surrounding why there are precisely three generations of particles in our universe. One proposed solution involves extending the Standard Model to include an SU_f(3) symmetry, introducing family gauge bosons known as familons that interact with neutrinos to potentially explain dark matter's prevalence over visible matter. In the context of heterotic line bundle models, research suggests that N=1 vacua leading to a small number of chiral families are favored, with a peak distribution at three chiral families for certain manifold volumes, hinting at a potential link between the maximal number of families and gauge couplings. Additionally, abnormalities in infants' ribs were found to indicate a dominantly inherited risk of serious health issues within their families, emphasizing the importance of genetic implications within family structures.
Is supersaturation involved in classical and nonclassical nucleation theories?
5 answers
Supersaturation plays a crucial role in both classical and nonclassical nucleation theories. In classical nucleation theory (CNT), supersaturation drives the formation of small clusters that reach a critical size to become thermodynamically stable for further growth. On the other hand, recent studies propose nonclassical features in nucleation, such as the two-step nucleation mechanism, where a metastable intermediate phase (MIP) exists alongside the supersaturated solution and final crystals. The PNC pathway challenges the traditional CNT view by emphasizing the dynamics of pre-nucleation clusters over critical nuclei, highlighting the importance of supersaturation dynamics in nucleation processes. Understanding supersaturation dynamics is essential for predicting crystal growth profiles and modulating crystal shapes in various systems, including colloidal nanocrystals.
How do galaxy clusters contribute to the large-scale structure of the universe?
5 answers
Galaxy clusters play a crucial role in shaping the large-scale structure of the universe through various mechanisms. The growth of the most massive halos via accretion and mergers generates shocks, bulk motions, and turbulence, injecting kinetic energy that contributes to heating and virialization, impacting the intra-cluster medium. Additionally, the expansion of the universe, incorporating a cosmological constant, affects the formation of large-scale structures, leading to gravitational phase transitions and cosmic energy equations within the system of galaxies. Observations of extragalactic filaments and the mapping of large-scale density fluctuations using statistical parameters like power spectra provide insights into the structure of the universe and constrain models of dark matter, dark energy, inflation, and brane cosmology. Tools like CLASS-PT and theoretical error likelihood approaches enable precise cosmological analyses of galaxy clustering data, extracting valuable cosmological information.
What is the scientific rationale behind incubating total cholesterol samples at 37°C?
5 answers
The scientific rationale behind incubating total cholesterol samples at 37°C lies in the structural transition and configurational changes in the aliphatic chain of the cholesterol molecule. Additionally, incubating samples at this temperature can induce capacitation-like changes in sperm, affecting their quality and viability. Furthermore, maintaining a stable temperature during storage is crucial for preserving the integrity of blood specimens, as fluctuations can impact the stability of the specimen and lead to changes in cholesterol levels. Therefore, incubating total cholesterol samples at 37°C ensures that any structural transitions or changes in the cholesterol molecule are accurately reflected in the analysis, contributing to the reliability of cholesterol level measurements.
What factors contribute to an individual's passion for beauty and hairstyling?
5 answers
An individual's passion for beauty and hairstyling is influenced by various factors. Research indicates that primary selection motives, job values, interactive characteristics, and perceived value play significant roles. Primary selection motives, categorized into social and personal motives, partially positively influence job values, which are classified into self-worth, extrinsic, and intrinsic job values. Moreover, the close interaction between students and educators, along with perceived values, can form a positive fanship for beauty educators, emphasizing the importance of empathy, communication, and social relationships in beauty education. These findings suggest that personal motivations, values, and interactions are crucial in shaping an individual's passion for beauty and hairstyling.
What are the effect of temperature changes on hydrate formation in sandstone?
4 answers
Temperature changes significantly impact hydrate formation in sandstone. Lower temperatures and higher pore pressures lead to enhanced strain-softening, stiffness, and strength in methane hydrate-bearing sediment (MHBS). Temperature fluctuations induce hysteresis in sand packs, affecting the intensity of temperature relaxation and hydrate formation, with distinct peaks indicating significant hydrate presence. Varying temperature gradients influence nucleation time, undercooling degree, reaction rate, and hydrate saturation in coarse sand, with optimal conditions at specific gradients. Heat transfer equations with phase transition govern the process of hydrate formation in sandstone, where increasing temperatures reduce permafrost strength and influence phase transitions of pore ice. Overall, temperature changes play a crucial role in regulating the formation, strength, and distribution of hydrates in sandstone.
Dark photons and dark neutrinos are the same or sterile neutrinos?
5 answers
Dark photons and dark neutrinos are distinct entities. Dark photons are hypothetical particles associated with dark matter interactions, while sterile neutrinos are neutrino variants that do not participate in weak interactions. Sterile neutrinos can be involved in dark matter scenarios, acting as mediators between dark matter and the Standard Model sector. On the other hand, dark photons are typically linked to new forces interacting with dark matter, potentially explaining anomalies like the muon's anomalous magnetic moment. Therefore, while sterile neutrinos can play a role in dark matter models, dark photons are more related to new forces and interactions within the dark sector, highlighting the distinction between these two hypothetical particles.
How does the pressure conduct in science?
5 answers
Pressure plays a crucial role in various scientific fields. In materials science, high pressure can induce structural changes and modify electronic properties, leading to phenomena like superconductivity. Additionally, the influence of hydrostatic pressure on the electrical conductivity of solids varies depending on the material type. Metals may exhibit either an increase or decrease in conductivity under pressure, with distinctions blurring at very high pressures. For semiconductors, pressure affects the energy gap width and mobility of charge carriers, eventually approaching metal-like conductivity at extreme pressures. In ionic crystals, conductivity decreases as pressure restricts ion migration space. Understanding these pressure-induced changes in conductivity is essential for interpreting behaviors in solid-state materials and geological formations like rocks.
How to analyse data collected in physical testing?
5 answers
To analyze data collected in physical testing, various methods can be employed. Initially, the data needs to be calibrated and particle identification should be done, followed by event selection, background estimation, and signal extraction. Statistical and systematic errors should be considered, along with confidence intervals, credible ranges, and hypothesis testing. Techniques like linear regression can be used to fit optimal lines to experimental data, aiding in result determination. Additionally, graphical representation of data, gradual deduction, and Monte Carlo techniques can be utilized for accurate analysis and achieving experiment objectives. By following these steps, one can ensure precise analysis of physical testing data, leading to valuable insights and informed decision-making.
Who creates dark web?
5 answers
The dark web is primarily created by individuals and organizations who host websites that can only be accessed through special anonymizing software like the Tor package. This hidden part of the internet has become a haven for various activities, including criminal enterprises that take advantage of the anonymity provided by the dark web and the use of anonymous cryptocurrency payments. While law enforcement struggles to track down these hidden sites, most successful actions against them have been due to operational mistakes made by the administrators of these sites. The dark web's structure and accessibility through specialized tools like Tor contribute to its elusive nature, making it challenging for authorities to monitor and regulate effectively.
What is the relationship between cross-linking density and the sol-gel transition in rubber?
4 answers
The relationship between cross-linking density and the sol-gel transition in rubber is crucial for understanding the transition from a liquid to a solid state. Studies have shown that the cross-linking density plays a significant role in this transition. The cross-linking density affects the gel fraction, volume fractions of polymer, and swelling ratio, ultimately influencing the transition behavior. Additionally, the intrinsic parameters governing the sol-gel transition, such as connectivity and polymer concentration, are influenced by the cross-linking density. Furthermore, the sol-gel transition in radical chain cross-linking copolymerization systems has been characterized by critical dynamic behavior near the transition point, with specific critical exponents indicating a percolation model. Overall, the cross-linking density directly impacts the sol-gel transition in rubber by influencing various parameters and behaviors.