Abhas Mitra

Abhas Mitra
Native name আভাস মিত্র
Born (1955-06-18) 18 June 1955
India
Fields
Institutions
Alma mater

Abhas Mitra (born 18 June 1955) is an Indian astrophysicist best known for his distinct views on several front-line astrophysics concepts, particularly related to black holes[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and Big Bang Cosmology involving Black Hole Information paradox.[16][17][18][19]

Mitra has regularly questioned the mainstream cosmological concepts of the "big bang" and "black holes".[20][21][22][23] Scientific diaspora including Richard A. Muller came into his favour of his claim of resolution of Black Hole Information paradox presented 13 years before Stephen Hawking. Richard Muller appreciating the claim of Mitra made remark,"I think Mitra resolved the paradox before Hawking, and did it in a way that is superior."[24] A detailed criticism of Mitra's claim of non-existence of black hole is also online. [25]

He claims to have offered exact proofs that:

Consequently, dark energy, his research claims, is an illusion caused by the departure of the complex universe from the simple big bang model.

Education and career

He is an alumnus of the Uttarpara Govt. High School, and the University of Calcutta. He did a part of his PhD work at the University of Kashmir before transferring because of armed insurgency that had erupted in Kashmir. The University of Mumbai conferred upon him the status of a "Distinguished Alumnus."

Scientific work

Eternally Collapsing Objects

Though Mitra stresses that the "black hole" solutions are correct, his contention is that black hole masses, arising from relevant integration constants, are actually zero. His peer reviewed paper published in the Journal of Mathematical Physics supports this contention by showing that Schwarzschild black holes have M = 0.[28] If so,

And since the formation of a mathematical zero mass black hole requires infinite proper time, continued gravitational collapse becomes eternal, and the so-called black hole candidates must be Eternally Collapsing Objects (ECO).[29][30][31][32]

Mitra's peer reviewed papers describe why continued physical gravitational collapse should lead to formation of ECOs rather than true black holes, and the mathematical "black hole" states can be achieved only asymptotically.[33][34][35][36] An ECO is essentially a quasi-stable ultra-compact ball of plasma which is so hot due to preceding gravitational contraction that its outward radiation pressure balances its inward pull of gravity. Mitra is not alone in this conclusion: Robertson and Leiter (2002) [37] reached a similar conclusion in their introduction of the concept of a magnetospheric eternally collapsing object as an alternative to the black hole model.

In 2014, soon after Stephen Hawking called the alleged loss of information in black holes his "biggest blunder",[38] Mitra received widespread attention in the Indian media, claiming that he had been "vindicated",[39][40][41] citing that he had apparently refuted Hawking and indicated the same almost 13 years back. [42] [43] [44] [45] [46]

Against the Big Bang Paradigm

As per the present version of Big Bang Paradigm, almost 70% of the mass energy of the universe is due to "Dark Energy" whose most likely form is Einstein's Cosmological Constant. But Mitra's research has shown that Cosmological Constant is exactly zero as suspected by many.[47][48][49][50]

As per his recent research, a Big Bang universe can expand only linearly[51][52] so that popular inflationary and cyclic models are actually inconsistent.

Since perfect Hubble flow implies radially outward motion of test particles receding from one another without any mutual collision, his research claimed to show that ideal Big Bang model corresponds to nil pressure and temperature. If correct, this implies that the ideal Big Bang model is fundamentally unable to describe the physical universe endowed with pressure and temperature.[53]

He has also questioned the physical reality of dark energy.[54]

Claimed confirmation of his prediction

According to Mitra, the so-called astrophysical black holes are ultra-magnetized and ultra-hot balls of plasma, nicknamed Magnetospheric Eternally Collapsing Objects which are something like extremely general relativistic versions of Sun. He claims, accordingly, MECOs can give rise to flares like Solar flares and Coronal mass ejections like the Sun. And on October 25, 2015, NASA reported that its NuStar telescope has detected a massive X-ray flare from a supermassive black hole in a certain quasar, and this flare appears to be triggered by emission of corona from very close to the black hole.[55] In an interview to Nature India, Mitra claimed that, emission of such a corona from the so-called black hole suggests that it is actually a MECO and not a true mathematical black hole.[56][57][58] In an international workshop entitled "Jet Triggering Mechanisms in Black Hole Sources", organized by Tata Institute of Fundamental Research, Mumbai, India (January 20–23, 2016), Mitra elaborated on this point in the presence of large number of astrophysicists.[59]

Academic associations

Mitra is associated with the Himalayan Gamma Ray Observatory[60] being set up at Han Leh jointly by Tata Institute of Fundamental Research, Bhabha Atomic Research Centre and Indian Institute of Astrophysics. He is also an Adjunct Prof. in Homi Bhabha National Science Institute since 2010.[61] Mitra is also a member of the International Astronomical Union.[62]

References

  1. ↑ "Black holes don't exist, says BARC scientist".
  2. ↑ "Meet the Indian who took on Stephen Hawking".
  3. ↑ "Indian Physicist Abhas Mitra Claims he Resolved Black Hole Paradox Years before Stephen Hawking".
  4. ↑ "Black Hole Paradox Resolved By Indian Physicist Much Before Stephen Hawking".
  5. ↑ "Indian Physicist Abhas Mitra Says he Resolved Black Hole Paradox Before Stephen Hawking".
  6. ↑ "Indian physicist vindicated in black hole controversy".
  7. ↑ "No Black Hole According To General Relativity? Nature India".
  8. ↑ "Hawking vs. Mitra : Are black holes really black holes?".
  9. ↑ "Abhas Mitra,singurul savant care a indraznit sa-i demonstreze lui Hawking ca teoria lui este gresita".
  10. ↑ "Te-ai inselat, domnule Stephen Hawking!".
  11. ↑ "BARC SCIENTIST: INDIA'S PRIDE: Indian Scientist Who Challenged Hawking's Blackholes Theory Proved Right".
  12. ↑ "Anti-black hole astrophysicist furnishes proof, Nature India Science News".
  13. ↑ "Black holes or balls of Quark Gluon plasma? Nature India Science News".
  14. ↑ "You're Wrong, Stephen Hawking! The Triumph of Abhas Mitra".
  15. ↑ "Scientific Black Wash: The jury is still out there on whether blackholes exist".
  16. ↑ "Indian Physicist Questions Physical Reality of Dark Energy".
  17. ↑ "Indian Physicist Questions Big Bang Basics".
  18. ↑ "Indian Scientist Contests Big Bang '`Evidences".
  19. ↑ "Nobel laureates challenge Indian astrophysicist's 'lumpy cosmos' claim, Nature India Science News".
  20. ↑ A. Mitra, Nature, 501, 391 (2013) "Comments on Nature Article '`Rare star probes supermassive black hole".
  21. ↑ A. Mitra, Nature, 500, 7464, 28 August (2013) "Comments on the Essay '`Theoretical Physics: The Origin of Space and Time".
  22. ↑ A. Mitra, Nature, 500, 7641, 6 August 2013 "Comments on the Nature Paper '`Spin Rate of Black Holes Pinned Down".
  23. ↑ "Various Comments Made by Mitra in response to Nature News on Black Holes".
  24. ↑ "Richard Muller on Quora.com".
  25. ↑ https://groups.google.com/forum/#!msg/sci.physics.relativity/pfBMXYZRgBU/qpCuQ_Lar0oJ
  26. ↑ "Eternally Collapsing Object".
  27. ↑ "The Genesis of "Magnetospheric Eternally Collapsing Object"".
  28. ↑ Mitra, A (2009). "Comments on The Euclidean gravitational action as black hole entropy, singularities, and space-time voids". Journal of Mathematical Physics. 50.
  29. ↑ Mitra, A.; Singh, K. K. (July 2013). "The Mass of the Oppenheimer-Snyder Hole: Only Finite Mass Quasi-Black Holes". International Journal of Modern Physics D. 22 (9).
  30. ↑ Mitra, A. (29 December 2010). "The fallacy of Oppenheimer Snyder collapse: no general relativistic collapse at all, no black hole, no physical singularity". Astrophysics and Space Science. 332 (1): 43–48. doi:10.1007/s10509-010-0578-5.
  31. ↑ Mitra, A. (1 October 2002). "On the final state of spherical gravitational collapse". Foundations of Physics Letters. 15 (5): 439–471.
  32. ↑ Mitra, A. (1 December 2000). "Non-occurrence of trapped surfaces and Black Holes in spherical gravitational collapse: An abridged version". Foundations of Physics Letters. 13 (6): 543–579.
  33. ↑ Mitra, A. (10 July 2006). "Why gravitational contraction must be accompanied by emission of radiation in both Newtonian and Einstein gravity". Physical Review D. 74 (2). doi:10.1103/physrevd.74.024010.
  34. ↑ Mitra, A. (1 March 2006). "A generic relation between baryonic and radiative energy densities of stars". Monthly Notices of the Royal Astronomical Society. 367: L66–L68. doi:10.1111/j.1745-3933.2006.00141.x.
  35. ↑ Mitrajournal=Monthly Notices of the Royal Astronomical Society, A. (11 June 2006). "Radiation pressure supported stars in Einstein gravity: eternally collapsing objects". 369 (1): 492–496. doi:10.1111/j.1365-2966.2006.10332.x.
  36. ↑ Mitra, A. (November 2006). "Sources of stellar energy, Einstein Eddington timescale of gravitational contraction and eternally collapsing objects". New Astronomy. 12 (2): 146–160. doi:10.1016/j.newast.2006.08.001.
  37. ↑ Stanley L. Robertson and Darryl J. Leiter, Astrophysical J., 565 447 (2002) (Institute of Physics, UK)"Evidence for Intrinsic Magnetic Moments in Black Hole Candidates".
  38. ↑ "Particle creation by black holes" (PDF).
  39. ↑ "Big Bang: Indian physicist says he's vindicated".
  40. ↑ "Big Bang: Indian Physicist Abhas Mitra Feels Vindicated".
  41. ↑ "Indian physicist who opposed Big Bang origin says he's vindicated".
  42. ↑ "Indian physicist claims he resolved Black Hole paradox much before Stephen Hawking".
  43. ↑ "Black Holes are Actually "Eternally Collapsing Objects" --Indian Physicist Refutes Hawking".
  44. ↑ "This Indian physicist disproved black holes 13 years before Hawking".
  45. ↑ "Indian physicist Abhas Mitra resolved Black Hole paradox much before Stephen Hawking".
  46. ↑ "Indian physicist resolved Black Hole paradox much before Hawking".
  47. ↑ Mitra, A. (March 2010). "Einstein energy associated with the Friedmann-Robertson-Walker metric". General Relativity and Gravitation. 42 (3): 443–469. doi:10.1007/s10714-009-0863-1.
  48. ↑ Mitra, A. (4 December 2012). "Interpretational conflicts between the static and non-static forms of the de Sitter metric". Nature Scientific Reports. 2. doi:10.1038/srep00923.
  49. ↑ Mitra, A.; Bhattacharyya, S.; Bhatt, N. (March 2013). "ΛCDM Cosmology Through the Lens of Einstein's Static Universe, the Mother of Λ". International Journal of Modern Physics D. 22 (3).
  50. ↑ Mitra, A. (March 2013). "Energy of Einstein's static universe and its implications for the ΛCDM cosmology". Journal of Cosmology and Astroparticle Physics. 2013.
  51. ↑ Mitra, A. (July 2014). "Why the Big Bang Model Does Not Allow Inflationary and Cyclic cosmologies Though Mathematically One Can Obtain Any Model With Favourable Assumptions". New Astronomy. 30: 46–50. doi:10.1016/j.newast.2013.12.002.
  52. ↑ Mitra, A. (February 2014). "Testing R_h=ct Cosmology From Fundamental Considerations: Is the Friedmann Universe Intrinsically Flat". General Relativity And Gravitation. 46: 1–12. doi:10.1007/s10714-014-1670-x.
  53. ↑ Mitra, A. (May 2011). "The matter in the Big-Bang model is dust and not any arbitrary perfect fluid!". Astrophysics & Space Science. 333 (1): 351–356. doi:10.1007/s10509-011-0635-8.
  54. ↑ "Physicist questions physical reality of 'Dark Energy'".
  55. ↑ "Black Hole Has Major Flare".
  56. ↑ "NASA capture calls for fresh look at black hole theories: Mitra".
  57. ↑ "Are Black Hole Ultra Hot Balls of Fire?".
  58. ↑ "Black Holes Are Ultra Hot Balls Of Fire Like Our Sun: Scientist".
  59. ↑ "Exploring Magnetospheric Origin of Jets For Both Neutron Star and "Black Hole" Systems" (PDF).
  60. ↑ "High Altitude Gamma Ray Observatory, Han Leh, India".
  61. ↑ "HBNI".
  62. ↑ "IAU".
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