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91.
92.
Edward FrenkelEvgeny Mukhin 《Advances in Mathematics》2002,171(1):139-167
We consider various specializations of the untwisted quantum affine algebras at roots of unity. We define and study the q-characters of their finite-dimensional representations. 相似文献
93.
94.
95.
Let {M
r,s
(p,p′)}1≤r≤p−1,1≤s≤p′−1 be the irreducible Virasoro modules in the (p,p′)-minimal series. In our previous paper, we have constructed a monomial basis of ⊕
r=1
p−1
M
r,s
(p,p′) in the case 1<p′/p<2. By ‘monomials’ we mean vectors of the form
, where φ
−n
(r′,r):M
r,s
(p,p′)→M
r′,s
(p,p′) are the Fourier components of the (2,1)-primary field and |r
0,s〉 is the highest weight vector of
. In this article, we introduce for all p<p′ with p≥3 and s=1 a subset of such monomials as a conjectural basis of ⊕
r=1
p−1
M
r,1(p,p′). We prove that the character of the combinatorial set labeling these monomials coincides with the character of the corresponding
Virasoro module. We also verify the conjecture in the case p=3.
相似文献
96.
We study polynomials p(x) satisfying a differential equation of the form p′′?h′p′ + Hp = 0, where h = x 3/3 + ax and H is a polynomial. We prove a conjecture of A. Eremenko and A. Gabrielov. 相似文献
97.
Evgeny Mukhin Vitaly Tarasov Alexander Varchenko 《Letters in Mathematical Physics》2012,100(2):151-160
For a set of quasi-exponentials with real exponents, we consider the discrete Wronskian (also known as Casorati determinant)
with pure imaginary step 2h. We prove that if the coefficients of the discrete Wronskian are real and the imaginary parts of its roots are bounded by
|h|, then the complex span of this set of quasi-exponentials has a basis consisting of quasi-exponentials with real coefficients.
This result is a generalization of the statement of the B. and M. Shapiro conjecture on spaces of polynomials. The proof is
based on the Bethe ansatz for the XXX model. 相似文献
98.
99.
D. A. Karashtin D. N. Mukhin N. K. Skalyga A. M. Feigin 《Radiophysics and Quantum Electronics》2009,52(10):705-713
We propose a method for recovery of the altitude profile of the stratosphere temperature using ground-based radiometric measurements.
The method is based on the Bayesian approach to solving inverse problems and involves determining the probability distribution
for the temperature in the entire range of the sounded altitudes. In this case, we use some assumptions on noise in the experimental
data and available a priori information about the recovered profile. Using the proposed approach, we compare the recovery results for two methods of
approximation and regularization of the recovered profile. It is shown that using the ground-based observations of solar radiation
in the oxygen absorption line 27_, it is possible to recover the temperature profile in the altitude range 20–55 km. 相似文献
100.
J. Lu A. Günther F. Schrettle F. Mayr S. Krohns P. Lunkenheimer A. Pimenov V. D. Travkin A. A. Mukhin A. Loidl 《The European Physical Journal B - Condensed Matter and Complex Systems》2010,75(4):451-460
Magnetic dc susceptibility between 1.5 and 800 K, ac
susceptibility and magnetization, thermodynamic properties, temperature
dependence of radio and audio-wave dielectric constants and conductivity,
contact-free dielectric constants at mm-wavelengths, as well as
ferroelectric polarization are reported for single crystalline BiFeO3.
A well developed anomaly in the magnetic susceptibility signals the onset of
antiferromagnetic order close to 635 K. Beside this anomaly no further
indications of phase or glass transitions are indicated in the magnetic dc
and ac susceptibilities down to the lowest temperatures. The heat capacity
has been measured from 2 K up to room temperature and significant
contributions from magnon excitations have been detected. From the
low-temperature heat capacity an anisotropy gap of the magnon modes of the
order of 6 meV has been determined. The dielectric constants measured in
standard two-point configuration are dominated by Maxwell-Wagner like
effects for temperatures T > 300 K and frequencies below 1 MHz. At lower
temperatures the temperature dependence of the dielectric constant and loss
reveals no anomalies outside the experimental errors, indicating neither
phase transitions nor strong spin phonon coupling. The temperature
dependence of the dielectric constant was measured contact free at microwave
frequencies. At room temperature the dielectric constant has an intrinsic
value of 53. The loss is substantial and strongly frequency dependent
indicating the predominance of hopping conductivity. Finally, in small thin
samples we were able to measure the ferroelectric polarization between 10
and 200 K. The saturation polarization is of the order of 40 μC/cm2, comparable to reports in literature. 相似文献