Results 71 to 80 of about 62,947 (343)

DeWitt Boundary Condition in One-Loop Quantum Cosmology

Universe, 2023
DeWitt’s suggestion that the wave function of the universe should vanish at the classical Big Bang singularity is considered here within the framework of one-loop quantum cosmology.
Giampiero Esposito
doaj   +1 more source

An extreme critical space-time: echoing and black-hole perturbations [PDF]

, 2000
A homothetic, static, spherically symmetric solution to the massless Einstein- Klein-Gordon equations is described. There is a curvature singularity which is central, null, bifurcate and marginally trapped.
Ashtekar A, Brady P R, Choptuik M W, Christodoulou D, Gundlach C, Gundlach C, Hara T, Hayward S A, Królak A, Oshiro Y, Penrose R, Roberts M D, Sean A Hayward   +12 more
core   +2 more sources

Bioprinting Organs—Science or Fiction?—A Review From Students to Students

Advanced Healthcare Materials, EarlyView.
Bioprinting artificial organs has the potential to revolutionize the medical field. This is a comprehensive review of the bioprinting workflow delving into the latest advancements in bioinks, materials and bioprinting techniques, exploring the critical stages of tissue maturation and functionality.
Nicoletta Murenu, Camilla Mussoni, Mateo S. Andrade Mier, Paula Buettner, Nathaly Chicaiza‐Cabezas, Yi‐Yu Robin Dai, Jessica Faber, Maren Fiedler, Zan Lamberger, Xuen Jen Ng, Vanessa Moessler, Anna Rederer, Jonas Roeder, Sabrina Stecher, Katinka Theis, Jeanette Weigelt, Silvia Budday, Gregor Lang, Natascha Schaefer   +18 more
wiley   +1 more source

Enhanced Approaches to Gravitational Lensing: A Regular Charged Black Hole in Weak Field Limit

Spektra: Jurnal Fisika dan Aplikasinya
Gravitational lensing, an integral aspect of general relativity, profoundly impacts our understanding of black holes (BH’s). The presence of a centered singularity resulting from gravitational collapse is a fundamental characteristic of a BH. Nonetheless,
H. M. U. Din, H. S. Ramadhan
doaj   +1 more source

3D Printing Strategies for Bioengineering Human Cornea

Advanced Healthcare Materials, EarlyView.
This review highlights recent progress in 3D bioprinting strategies for engineering human corneas. Key aspects include the replication of corneal transparency, curvature, and biomechanical properties, alongside innovations in recent advancements in 3D printing methods, which benefit in overcoming current challenges.
Yunong Yuan, Khoon S. Lim, Gerard Sutton, Gordon G. Wallace, Jingjing You   +4 more
wiley   +1 more source

Born–Infeld black holes in 4D Einstein–Gauss–Bonnet gravity

European Physical Journal C: Particles and Fields, 2020
A novel four-dimensional Einstein-Gauss-Bonnet gravity was formulated by Glavan and Lin (Phys. Rev. Lett. 124:081301, 2020), which is intended to bypass the Lovelock’s theorem and to yield a non-trivial contribution to the four-dimensional gravitational ...
Ke Yang, Bao-Min Gu, Shao-Wen Wei, Yu-Xiao Liu   +3 more
doaj   +1 more source

Progressive Insights into 3D Bioprinting for Corneal Tissue Restoration

Advanced Healthcare Materials, EarlyView.
This review explores the potential of 3D bioprinting to replicate the complex structure and function of the human cornea. It highlights key advances in bioink development, printing modalities, and in vivo performance, while addressing current challenges and emerging strategies. The review emphasizes bioprinting's promise to overcome donor shortages and
Ilayda Namli, Deepak Gupta, Yogendra Pratap Singh, Pallab Datta, Muhammad Rizwan, Mehmet Baykara, Ibrahim T. Ozbolat   +6 more
wiley   +1 more source

Formation and evaporation of an electrically charged black hole in conformal gravity

European Physical Journal C: Particles and Fields, 2018
Extending previous work on the formation and the evaporation of black holes in conformal gravity, in the present paper we study the gravitational collapse of a spherically symmetric and electrically charged thin shell of radiation.
Cosimo Bambi, Leonardo Modesto, Shiladitya Porey, Lesław Rachwał   +3 more
doaj   +1 more source

On the back reaction of gravitational and particle emission and absorption from straight thick cosmic strings: A toy model

, 1999
The emission and absorption of gravitational waves and massless particles of an infinitely long straight cosmic string with finite thickness are studied.
A. Vilenkin, A. Z. Wang, A. Z. Wang, Anzhong Wang, E. M. De Sa, E. Poisson, E. Shaver, J. A. Stein-Schabes, K. S. Thorne, M. L. Bedran, P. S. Letelier, P. Szekeres, R. A. Battye, S. J. Campbell, T. W. B. Kibble, U.-L. Pen, Yumei Wu   +16 more
core   +1 more source

Singularities and horizons in the collisions of gravitational waves [PDF]

Physical Review D, 1989
It is well known that when gravitational plane waves propagating and colliding in an otherwise flat background interact they produce singularities. In this paper we explore the structure of the singularities produced in the collisions of arbitrarily polarized gravitational plane waves and we consider the problem of whether (or under what conditions ...
openaire   +3 more sources