Primordial black holes and asteroid danger

Probability for a primordial black hole to invade the Kuiper belt was calculated. We showed that primordial black holes of certain masses can significantly change asteroids' orbits. These events may result in disasters, local for our solar system and global for the Earth (like the Tunguska meteorite). We also estimated how often such events occur.Comment: 5 page

Benchmark on neutron capture extracted from (d,p)(d,p) reactions

Direct neutron capture reactions play an important role in nuclear astrophysics and applied physics. Since for most unstable short-lived nuclei it is not possible to measure the $(n, \gamma)$ cross sections, $(d,p)$ reactions have been used as an alternative indirect tool. We analyze simultaneously $^{48}{\rm Ca}(d,p)^{49}{\rm Ca}$ at deuteron energies $2, 13, 19$ and 56 MeV and the thermal $(n,\gamma)$ reaction at 25 meV. We include results for the ground state and the first excited state of $^{49}$Ca. From the low-energy $(d,p)$ reaction, the neutron asymptotic normalization coefficient (ANC) is determined. Using this ANC, we extract the spectroscopic factor (SF) from the higher energy $(d,p)$ data and the $(n, \gamma)$ data. The SF obtained through the 56 MeV $(d,p)$ data are less accurate but consistent with those from the thermal capture. We show that to have a similar dependence on the single particle parameters as in the $(n, \gamma)$, the (d,p) reaction should be measured at 30 MeV.Comment: 5 pg, 4 figs, Phys. Rev. C (rapid) in pres

Entendimento poético como entrada inicial de ser-no-mundo

Comprehension of modern poetic phenomena is based on Heidegger’s fundamental ontology and Gadamer's hermeneutics. The rhythm of poetry cuts through the inner space of a thing, as agitated movements cut through the air, and almost every poetic line exists in its own special inclination, which makes the poems become voluminous. The composition of words in poetry is shifted and relabeled as if over tightened by a single rhythmic impulse, which also changes the state of literature. The initial occurrence of being-in-the-world through poetic understanding – these are the word-whistlers and word-spells from which verses are created, can be formed (and are added) into meaningful phrases, but their nature remains the same: mental and impulsive, in fact, pre-speech. According to Heidegger, Poetry is regarded as the initial mode of realization of the language. The essence of language – speech – permeates all existentials (being-preunderstanding, mood), in its original mode, speech is revealed in the self-pronunciation of being-in-the-world, that is, in finding the word-in-being-in-the-world. Since the pronunciation of meaning in words occurs simultaneously with understanding, poetic pronunciation is the place for the most complete manifestation of meaning in language.La comprensión de los fenómenos poéticos modernos se basa en la ontología fundamental de Heidegger y la hermenéutica de Gadamer. El ritmo de la poesía atraviesa el espacio interior de una cosa, como movimientos agitados cortan el aire, y casi todas las líneas poéticas existen en su propia inclinación especial, lo que hace que los poemas se vuelvan voluminosos. La composición de las palabras en la poesía se desplaza y se vuelve a etiquetar como si estuviera más apretada por un solo impulso rítmico, que también cambia el estado de la literatura. La aparición inicial del ser en el mundo a través de la comprensión poética: estos son los silbadores de palabras y los hechizos de palabras a partir de los cuales se crean los versos, se pueden formar (y agregar) en frases significativas, pero su naturaleza sigue siendo la misma: Mental e impulsivo, de hecho, pre-discurso. Según Heidegger, la poesía es considerada como el modo inicial de realización del lenguaje. La esencia del lenguaje, el habla, impregna todos los existenciales (ser un pre-entendimiento, estado de ánimo), en su modo original, el habla se revela en la auto-pronunciación de ser-en-el-mundo, es decir, en encontrar la palabra-in estar en el mundo Dado que la pronunciación del significado en palabras ocurre simultáneamente con la comprensión, la pronunciación poética es el lugar para la manifestación más completa del significado en el lenguaje.A compreensão dos fenómenos poéticos modernos baseia-se na ontologia fundamental de Heidegger e na hermenêutica de Gadamer. O ritmo da poesia corta o espaço interior de uma coisa, enquanto movimentos agitados atravessam o ar, e quase todas as linhas poéticas existem em sua própria inclinação especial, o que faz com que os poemas se tornem volumosos. A composição das palavras na poesia é deslocada e rotulada como se fosse apertada por um único impulso rítmico, que também muda o estado da literatura. A ocorrência inicial do ser-no-mundo através da compreensão poética - estes são os assobiadores de palavras e os feitiços de palavras dos quais os versos são criados, podem ser formados (e adicionados) em frases significativas, mas sua natureza permanece a mesma: mental e impulsivo, de fato, pré-fala. Segundo Heidegger, a Poesia é considerada o modo inicial de realização da linguagem. A essência da linguagem - fala - permeia todos os existenciais (estar-pre-entendimento, humor), em seu modo original, a fala é revelada na auto-pronúncia do ser-no-mundo, ou seja, em encontrar a palavra-in-the-word. estar-no-mundo. Como a pronúncia do significado em palavras ocorre simultaneamente à compreensão, a pronúncia poética é o lugar para a mais completa manifestação de significado na linguagem

Feasibility of a Small, Rapid Optical-to-IR Response, Next Generation Gamma Ray Burst Mission

We present motivations for and study feasibility of a small, rapid optical to IR response gamma ray burst (GRB) space observatory. By analyzing existing GRB data, we give realistic detection rates for X-ray and optical/IR instruments of modest size under actual flight conditions. Given new capabilities of fast optical/IR response (about 1 s to target) and simultaneous multi-band imaging, such an observatory can have a reasonable event rate, likely leading to new science. Requiring a Swift-like orbit, duty cycle, and observing constraints, a Swift-BAT scaled down to 190 square cm of detector area would still detect and locate about 27 GRB per yr. for a trigger threshold of 6.5 sigma. About 23 percent of X-ray located GRB would be detected optically for a 10 cm diameter instrument (about 6 per yr. for the 6.5 sigma X-ray trigger).Comment: Elaborated text version of a poster presented at 2012 Malaga/Marbella symposiu

Stochastic Inflation Revisited: Non-Slow Roll Statistics and DBI Inflation

Stochastic inflation describes the global structure of the inflationary universe by modeling the super-Hubble dynamics as a system of matter fields coupled to gravity where the sub-Hubble field fluctuations induce a stochastic force into the equations of motion. The super-Hubble dynamics are ultralocal, allowing us to neglect spatial derivatives and treat each Hubble patch as a separate universe. This provides a natural framework in which to discuss probabilities on the space of solutions and initial conditions. In this article we derive an evolution equation for this probability for an arbitrary class of matter systems, including DBI and k-inflationary models, and discover equilibrium solutions that satisfy detailed balance. Our results are more general than those derived assuming slow roll or a quasi-de Sitter geometry, and so are directly applicable to models that do not satisfy the usual slow roll conditions. We discuss in general terms the conditions for eternal inflation to set in, and we give explicit numerical solutions of highly stochastic, quasi-stationary trajectories in the relativistic DBI regime. Finally, we show that the probability for stochastic/thermal tunneling can be significantly enhanced relative to the Hawking-Moss instanton result due to relativistic DBI effects.Comment: 38 pages, 2 figures. v3: minor revisions; version accepted into JCA

HugeNon-Organ Retroperitoneal Tumor inCombination with aCystoma of Uterine Appendages

The article describes the experience of successful diagnostics and treatment of giant non-organ extraperitoneal tumor combined with a cystoma of uterine appendages.Patient P., 43 years old, was hospitalized in the oncology department, diagnosed with “Abdominal tumor, right ovary?” The state was satisfactory, after palpation of the abdomen, a lumpy formation of a densely elastic consistency, from the womb to the epigastric region, was found. An ultrasound revealed a homogeneous tumor formation 30×28 cm from the border of the uterus to the liver. When performing median laparotomy, a dumbbell-shaped tumor (36×26×20 cm) was found in the retroperitoneal space with involvement of the mesentery of the small intestine, lower horizontal portion of the duodenum, mesentery of the transverse colon, superior mesenteric vessels, aorta and jejunum. In the right appendages, a cystoma 12–15 cm in diameter was found, with inversion and necrosis. Adnexectomy was performed. An express lymph node biopsy revealed cells suspicious for malignancy. The tumor was mobilized and removed as a single unit with retroperitoneal tissue, lymph nodes in combination with resection of 70 cm of the jejunum and fenestrated resection of the duodenum. The resulting gut defect 9×7 cm was sutured with a precision single-row suture. Inter-intestinal anastomosis “endto-end” was formed. Nasointestinal intubation was performed. The abdominal cavity was sutured, and two tubular drainages were installed. The postoperative period was uneventful. The histological conclusion: fibrous histiocytoma of the mesentery of the intestine with malignancy in the center of the node, in the ovary – total hemorrhagic infiltration of all layers, edema. The tumor conference consultation was recommended. After 1.5 years, the patient was admitted with the same clinical picture. During laparotomy, a tumor recurrence was discovered, the nodes of which were located in the retroperitoneal space, in the abdominal cavity with invasion to organs and large vessels. The case was recognized as inoperable, the laparotomic wound was closed completely. Sixteen days after surgery the patient was discharged

Reversible Pressure-Induced Amorphization in Solid C70 : Raman and Photoluminescence Study

We have studied single crystals of $C_{70}$ by Raman scattering and photoluminescence in the pressure range from 0 to 31.1 GPa. The Raman spectrum at 31.1 GPa shows only a broad band similar to that of the amorphous carbon without any trace of the Raman lines of $C_{70}$. After releasing the pressure from 31.1 GPa, the Raman and the photoluminescence spectra of the recovered sample are that of the starting $C_{70}$ crystal. These results indicate that the $C_{70}$ molecules are stable upto 31.1 GPa and the amorphous carbon high pressure phase is reversible, in sharp contrast to the results on solid $C_{60}$. A qualitative explaination is suggested in terms of inter- versus intra-molecular interactions.Comment: To appear in Phys. Rev. Lett., 12 pages, RevTeX (preprint format), 3 figures available upon reques

Circles in the Sky: Finding Topology with the Microwave Background Radiation

If the universe is finite and smaller than the distance to the surface of last scatter, then the signature of the topology of the universe is writ large on the microwave background sky. We show that the microwave background will be identified at the intersections of the surface of last scattering as seen by different ``copies'' of the observer. Since the surface of last scattering is a two-sphere, these intersections will be circles, regardless of the background geometry or topology. We therefore propose a statistic that is sensitive to all small, locally homogeneous topologies. Here, small means that the distance to the surface of last scatter is smaller than the ``topology scale'' of the universe.Comment: 14 pages, 10 figures, IOP format. This paper is a direct descendant of gr-qc/9602039. To appear in a special proceedings issue of Class. Quant. Grav. covering the Cleveland Topology & Cosmology Worksho

Scaling of THz-conductivity at metal-insulator transition in doped manganites

Magnetic field and temperature dependence of the Terahertz conductivity and permittivity of the colossal magnetoresistance manganite Pr_{0.65}Ca_{0.28}Sr_{0.07}MnO_3 (PCSMO) is investigated approaching the metal-to-insulator transition (MIT) from the insulating side. In the charge-ordered state of PCSMO both conductivity and dielectric permittivity increase as function of magnetic field and temperature. Universal scaling relationships between the changes in permittivity and conductivity are observed in a broad range of temperatures and magnetic fields. Similar scaling is also seen in La_{1-x}Sr_xMnO_3 for different doping levels. The observed proportionality points towards the importance of pure ac-conductivity and phononic energy scale at MIT in manganites.Comment: 5 pages, 4 figure