75 research outputs found
Can Musical Emotion Be Quantified With Neural Jitter Or Shimmer? A Novel EEG Based Study With Hindustani Classical Music
The term jitter and shimmer has long been used in the domain of speech and
acoustic signal analysis as a parameter for speaker identification and other
prosodic features. In this study, we look forward to use the same parameters in
neural domain to identify and categorize emotional cues in different musical
clips. For this, we chose two ragas of Hindustani music which are
conventionally known to portray contrast emotions and EEG study was conducted
on 5 participants who were made to listen to 3 min clip of these two ragas with
sufficient resting period in between. The neural jitter and shimmer components
were evaluated for each experimental condition. The results reveal interesting
information regarding domain specific arousal of human brain in response to
musical stimuli and also regarding trait characteristics of an individual. This
novel study can have far reaching conclusions when it comes to modeling of
emotional appraisal. The results and implications are discussed in detail.Comment: 6 pages, 12 figures, Presented in 4th International Conference on
Signal Processing and Integrated Networks (SPIN) 201
Analysis of Fermi-LAT data from Tucana-II: Possible constraints on the Dark Matter models with an intriguing hint of a signal
Tucana-II (Tuc-II), a recently discovered and confirmed Ultra Faint Dwarf
Spheroidal galaxy, has a high mass to light ratio as well as a large
line-of-sight stellar velocity dispersion, thus making it an ideal candidate
for an indirect dark matter (DM) search. In this paper, we have analyzed nine
years of -ray data obtained from the \textit{Fermi}-LAT instrument from
the direction of Tuc-II. The fact that a very weak significant -ray
excess () over the background of Tuc-II have been detected from the
location of this galaxy. We have observed that this excess of -ray
emission from the of location Tuc-II rises with longer periods of data. If WIMP
pair annihilation is assumed for this faint emission, for
annihilation channel the test statistics (TS) value peaks at DM mass 14
GeV and for annihilation channel it peaks at DM mass 4 GeV.
It is then called for an estimation of the confidence level upper limit
of the possible velocity weighted self-annihilation cross-section of the DM
particles (WIMPs) within Tuc-II by fitting the observed -ray flux with
spectra expected for DM annihilation. The estimated upper limits of the
cross-sections from Tuc-II are then compared with two other dwarf galaxies that
are considered to be good DM candidates in several studies. We have also
compared our results with the cross-sections obtained in various popular
theoretical models of the WIMPs to find that our results impose reasonable
tight constraints on the parameter spaces of those DM models. In the concluding
section, we compared our results with the similar results obtained from a
combined dSph analysis by the \textit{Fermi}-LAT collaboration as well as the
results obtained from the studies of DM in the dwarf galaxies by the major
ground-based Cherenkov experiments.Comment: 23 pages, 16 figures, 7 table
Estimating phase transition of perturbed J1-J2 Heisenberg quantum chain in mixtures of ground and first excited states
We show that the nearest neighbour entanglement in a mixture of ground and
first excited states - the subjacent state - of the J1-J2 Heisenberg quantum
spin chain can be used as an order parameter to detect the phase transition of
the chain from a gapless spin fluid to a gapped dimer phase. We study the
effectiveness of the order parameter for varying relative mixing probabilities
between the ground and first excited states in the subjacent state for
different system sizes, and extrapolate the results to the thermodynamic limit.
We observe that the nearest neighbour concurrence can play a role of a good
order parameter even if the system is in the ground state, but with a small
probability of leaking into the first excited state. Moreover, we apply the
order parameter of the subjacent state to investigate the response to
introduction of anisotropy and of glassy disorder on the phase diagram of the
model, and analyse the corresponding finite-size scale exponents and the
emergent tricritical point.Comment: 14 pages, 9 figure
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