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Description
Black Holes: New HorizonsBlack holes, once just fascinating theoretical predictions of how gravity warps space time according to Einstein's theory, are now generally accepted as astrophysical realities, formed by post supernova collapse, or as supermassive black holes mysteriously found at the cores of most galaxies, powering active galactic nuclei, the most powerful objects in the universe. Theoretical understanding has progressed in recent decades with a wider realization
Black holes, once just fascinating theoretical predictions of how gravity warps space-time according to Einstein's theory, are now generally accepted as astrophysical realities, formed by post-supernova collapse, or as supermassive black holes mysteriously found at the cores of most galaxies, powering active galactic nuclei, the most powerful objects in the universe. Theoretical understanding has progressed in recent decades with a wider realization that local concepts should characterize black holes, rather than the global concepts found in textbooks. In particular, notions such as trapping horizon allow physically meaningful quantities and equations, describing how a black hole evolves. This has led to discoveries in fields as diverse as classical and numerical general relativity, differential geometry, thermodynamics, quantum field theory, and quantum gravity. There is heretofore no one volume which covers all the main aspects, so this volume collects together summaries and recent research, each chapter written by an expert or experts in a given field. This is intended for readers at a graduate level upwards, who wish to learn about the wide range of research concerning black holes.Shipping Notes
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4.1 ★★★★★
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Product Reviews
★★★★★ 5
Biotène Fluoride Toothpaste for Dry Mouth Symptoms
Size: 4.3 Ounce (Pack of 1)
I have been using this toothpaste on and off for a few years ever since I got a dry mouth. It is very good and leaves your mouth feeling fresh. Unfortunately it doesn't get rid of your dry mouth.
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Chemical free is important
Size: 4.3 Ounce (Pack of 1)
I don’t like doing fluoride, but I do know that some fluoride is important so this is the cleanest fluoride toothpaste I could find and I use it in conjunction with a non-fluoride toothpaste I have I love the flavor. I love the fact that it doesn’t have a lot of the bad chemicals in it.
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Reviewed in the United States on May 8, 2026
★★★★★ 4
It Doesn’t Burn
Size: 4.3 Ounce (Pack of 1)
Toothpaste burns my mouth. Idk why. Started during menopause along with the many other things that changed about myself. I do like it. It doesn’t burn. But, it doesn’t give me that clean feeling.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Works great
Size: 4.3 Ounce (Pack of 1)
Love this toothpaste
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Effective for dry mouth
Size: 4.3 Ounce (Pack of 1)
I love this. It’s great for dry mouth and it makes your breath smell good too
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Reviewed in the United States on May 31, 2026