String Theory, Big bang and Multiverse in Bhagwat Gita.

Remarks of Scientists on Bhagavad Gita, is not a rumors but fascinating fact that opens a scientific detail of Bhagavad Gita , generally common people were not aware of it. Albert Einstein openly praised Bhagavad Gita considering it as a book of cosmic truth. Not only Einstein but also his friend J. Robert Oppenheimer quoted Bhagavad Gita's slok after experiencing the powerful scientific miracles of Atomic Bomb in the very first successful test detonated on July 16, 1945 in New Mexico. Oppenheimer remarked that it brought to mind words from the Bhagavad Gita: "Now I am become Death, the destroyer of worlds." J. Robert Oppenheimer was an American theoretical physicist and the wartime leader of the Manhattan Project, in World War II 

Diversity of species, Big bang theory, Multiverse, String Theory in one Sloka of Bhagwat Geeta:
महर्षयः सप्त पूर्वे चत्वारो मनवस्तथा। मद्भावा मानसा जाता येषां लोक इमाः प्रजाः।।BG10.6।।
Meaning: The seven great sages and before them the four other great sages and the Manus [progenitors of mankind] come from Me, born from My mind, and all the living beings populating the various planets descend from them.

Purport By Srila Prabhupada:

The Lord is giving a genealogical synopsis of the universal population ( Concept of diversity of species). Brahmā is the original creature born out of the energy of the Supreme Lord, who is known as Hiraṇyagarbha ( this the concept of the Singularity of Big bang theory).And from Brahmā all the seven great sages, and before them four other great sages, named Sanaka, Sananda, Sanātana and Sanat-kumāra, and the fourteen Manus, are manifested.All these twenty-five great sages are known as the patriarchs(founder or ancestor) of the living entities all over the universe. All of them are born of these twenty-five patriarchs.

Concept of Multiverse:

There are innumerable universes and innumerable cosmic objects within each universe, and each planet is full of population of different varieties.

String Theory:

According to the basic concept of String Theory, the Entire Universe is a vibration of a string of one, unique and inalienable supremacy. Then from Brahmā came Sanaka, Sananda, Sanātana and Sanat-kumāra, then Rudra, and then the seven sages, and in this way all the brāhmaṇas and kṣatriyas are born out of the energy of the Supreme Personality of the Universe. 

                             

According to Carl Sagan and M. Anant Bhakta (from the book ‘Vedic String Theory’), a pioneer endeavor is made to exhibit the Conception String Theory of Everything found by the Vedic sages, maybe four to five centuries ago, on which the Vedanta philosophy stands. … at the primordial level and from a void-like endless cosmic ocean of divine consciousness  (the Brahman, the Unborn), manifests the generator of 'Strings or Sutras of awareness' — called the Hiranyagarbha (Golden Egg, the Firstborn), which is the forerunner or pioneer of the universes and generally known as Inflationary model of Cosmology. 

M. Anant Bhakti further says, 
“Hiranyagarbha is variously translated as the Golden Egg, Golden Embryo … also called ‘Sutratma,’ the string-shaped consciousness (Atman) … Sutras mean ‘strings’ … accurate to regard sutras as strings with encoded program. According to Sanskrit scholars, sutra literally means ‘that which generates something.’ … Hiranyagarbha or the string field … that, along with consciousness, pervades the universe is also called VYOMA (Ether).”

Brahmā is known as Pitāmaha, the grandfather, and Kṛṣṇa is known as Prapitāmaha, the father of the grandfather.

That is stated in the Eleventh Chapter of the Bhagavad-gītā (11.39).

                                                      वायुर्यमोऽग्निर्वरुणः शशाङ्कः

                                                             प्रजापतिस्त्वं प्रपितामहश्च।

                                                            नमो नमस्तेऽस्तु सहस्रकृत्वः

                                                            पुनश्च भूयोऽपि नमो नमस्ते।।11.39।।

You alone are the great-grandsire of all and also grandfather etc. The Prajapatis are the fathers of all creatures. Hiranyagarbha (Brahma), the father of the Prajapatis, is the grandsire of all creatures. You, being the father of even Hiranyagarbha, are great grandfather of all creatures. You alone are denoted by the several terms by which these beings are known. Your power is infinite; Your majesty immeasurable;Such is the meaning. Beholding the Lord in a most marvellous form, Arjuna, bent with great awe, saluted Him from all sides with his eyes widely open from joy.

 (Translated By Swami Adidevananda).

आप ही वायु, यमराज, अग्नि, वरुण, चन्द्रमा, दक्ष आदि प्रजापति और प्रपितामह (ब्रह्माजीके भी पिता) हैं। आपको हजारों बार नमस्कार हो नमस्कार हो और फिर भी आपको बारबार नमस्कार हो नमस्कार हो।।
O my dear Krishna, ocean of endless mercy, You are the true friend of the porr and distressed and the source of the entire Universe. You are the master of the Gopalas and the lover of the Gopis, especially Radharani. I offer all of my admiring reverence unto You.